Yolk sac fate

The yolk sac is an early extra-embryonic membrane which is endoderm origin and covered with extra-embryonic mesoderm. Yolk sac lies outside the embryo connected by a yolk stalk (vitelline duct, omphalomesenteric duct) to the midgut with which it forms a continuous connection. The endodermal lining is continuous with the endoderm of the gastrointestinal tract The origin and fate of yolk sac hematopoiesis: application of chimera analyses to developmental studies Hiroo Ueno* and Irving L. Weissman Institute of Stem Cell Biology and Regenerative Medicine, Departments of Pathology and Developmental Biology, Ludwig Institute at Stanford University, Stanford University, Stanford, CA, US

Yolk Sac Development - Embryolog

The origin and fate of yolk sac - Int

Egg, embryo, yolk content, and yolk sac membrane were weighed, and the yolk sac (YS; i.e., yolk content + yolk sac membrane) composition was analyzed. From 30 to 50 wk of age, the albumen weight increased by 13.3%, whereas the yolk increased by more than 40%. The proportion of fat in the fresh yolk of the 30-wk-old group was 23.8% compared with. Yolk sac tumors, also termed endodermal sinus tumors, are believed to develop as a result of differentiation of primitive malignant germ cell elements in the direction of yolk sac or vitelline structures, including embryonal and extraembryonal tissues. 195,196 These are uncommon neoplasms in the ovary and follow dysgerminoma or immature teratoma in incidence, depending on the age group. 171,172 A yolk sac tumor is usually encountered in the second and third decades, followed by the first and.

Fetal membranes

The yolk sac plays an important role in breathing and nutrition of a fetus, performs the excretory and other functions before formed organs of the fetus and placenta assume this function. After 12-13th week, the yolk sac retracts into the cavity of the fetus, decreases and remains only in the form of cystic formation at the umbilical cord Serum α-feto protein (AFP) is a useful bio-marker of yolk sac tumor diagnosis. It is present in almost 100% of the cases, and can be easily analyed from a venous blood sample. You might also be referred to an ultrasound expert or undergo an MRI, since these modalities can be used to detect the tumor Here, we hypothesise that the hypoblast-derived primary yolk sac serves as a source for early extraembryonic mesoderm, which is supplemented with mesoderm from the gastrulating embryo. We discuss the intricate relationship between the yolk sac and the primate embryo and highlight the pivotal role of the yolk sac as a multifunctional hub for haematopoiesis, germ cell development and nutritional supply

The yolk sac is a pouch-like tissue in the early embryo that lies adjacent to the embryonic hypoblast portion of the developing inner cell mass. Its earliest stage during implantation in the mammal is derived from the blastocyst cavity and is termed the primary yolk sac The primary yolk sac becomes reduced in size and is known as the secondary yolk sac. In humans the yolk sac contains no yolk but is important for the transfer of nutrients between the fetus and mother. Epiblast. Epiblast cells cavitate to form the amnion, an extra-embryonic epithelial membrane covering the embryo and amniotic cavity. Cells from the epiblast will also eventually form the body of the embryo. Extra-embryonic mesoderm. Extra-embryonic mesoderm cells migrate between the. By this, way the embryo undercuts and separates itself from the underlying yolk mass. Formation of Yolk Sac and its Fate: The yolk, though supplies nourishment to the embryo, is not considered as part of the embryo. But in cases where the quantity of yolk is very large, special yolk sac develops to store the yolk The yolk stalk is a narrow tube connecting the yolk sac and the jejunum of the embryo (Romanoff, 1960, Dzoma and Dorrestein, 2001) and can already be recognized at ED3 (Patten, 1920). In the beginning of the incubation period, the opening from the intestine to the yolk sac is a short narrow slit

Here the authors use fate mapping and intravital microscopy to track the movement of resident macrophage precursors from the yolk sac to fetal tissues during development

As a contribution to the problem of the immunological privilege of the fetus it was decided to investigate the fate of yolk sac grafts in mice. Ten-day post-coitum mouse visceral yolk sac was transplanted to a dermal tunnel in the flank of isogeneic animals. In this site the yolk sac was capable of surviving for at least 15 days past the normal. ABSTRACT During mammalian development, as exemplified by mice, hematopoietic cells first appear in the yolk sac blood islands, then in the dorsal aorta of the aorta-gonad-mesonephros (AGM) region and the placenta, eventually seeding into liver, spleen and then bone marrow. The formation of hematopoietic stem cells from mesodermal precursors has.

Yolk sac - Wikipedi

Yolk sac Radiology Reference Article Radiopaedia

The human embryo, but not its yolk sac, generates lympho-myeloid stem cells: Mapping multipotent hematopoietic cell fate in intraembryonic mesoderm Citation for published version: Tavian, M, Robin, C, Coulombel, L & Peault, B 2001, 'The human embryo, but not its yolk sac, generate 卵黄囊( yolk sac)为一囊状结构,位于胚盘腹侧,内胚层为其顶。最初的卵黄囊是由细胞滋养层向内板裂而成的初级卵黄囊,以后内胚层周缘的细胞向腹侧增生包绕,形成次级卵黄囊。在人胚、卵黄囊的出现只是生物进化过程的重演,无机能意义 Yolk sac tumors (YSTs) are malignant germ cell tumors that secrete alpha-fetoprotein (AFP). These tumors commonly develop in infants, young children, and young women and often originate in the gonads. Primary endometrial YST is a very rare malignancy, and a primary endometrial YST in the absence of abnormal AFP levels is even rarer Embryology animation in 3D, this time the folding of the embryo, in the early days.The spaces around the embryo change dramatically over the course of develo.. C. Yolk sac tumor of the testis can be germ cell neoplasia in situ related (postpubertal type) or germ cell neoplasia in situ unrelated (prepubertal type), showing a bimodal epidemiology (young adults and young children, respectively). Glypican 3 is sensitive but not a specific marker of this tumor type

Fetal membrane layers, Chorion, Amnion, Yolk sac

  1. ABSTRACT. The present study was conducted to characterize the yolk sac utilization in fast and slow-growing chicks, subjected to feed and water deprivation. Two experiments were carried out; using two hundred fifty broiler chicks (Lohmann) in the first experiment and two hundred fifty layer chicks (Bovan) in the second one
  2. Interplay between SOX7 and RUNX1 regulates hemogenic endothelial fate in the yolk sac . Andrew J. Lilly1, Guilherme Costa1,4, Anne Largeot2, Muhammad Z. H. Fadlullah1, Michael Lie‐A‐Ling2, Georges Lacaud2,* and Valerie Kouskoff1,* Cancer Research UK 1Stem Cell . Hematopoiesis, 2Stem Cell Biology Group, Cancer Research U
  3. Yolk Sac or Germ Cell Tumor. A yolk sac tumor is a rare, malignant tumor of cells that line the yolk sac of the embryo. These cells normally become ovaries or testes; however, the cause of a yolk sac tumor is unknown. It is most often found in children before the ages of 1 to 2, but can occur throughout life
  4. In reptiles and birds, the yolk sac has a function associated with nutrition. In mammals the yolk sac acts as a source of primordial germ cells and blood cells. Note that in early development (week 2) a structure called the primitive yolk sac forms from hypoblast, this is an entirely different structure. Allantoi

Somatic yolk sac tumor: Yolk sac tumor associated with a somatic epithelial neoplasm, usually high grade (Histopathology 2016;69:739) Thought to be due to transdifferentiation of high grade carcinoma to yolk sac tumor, rather than a true mixed or collision tumor (i.e. somatic rather than germ cell origin) (Histopathology 2016;69:739, Int J. One concerned husband reported that the yolk sac during his wife's pregnancy measured 8.2mm. They went on to have a healthy baby girl. Read his story, Case Study: Very Large Yolk Sac and Bicornuate Uterus in a Live Birth A case report in which a yolk sac was measured at 8.1mm but resulted in a live birth. This report states that the quality of. What is the normal growth of the yolk sac and when does it stop growing? I am currently 8 weeks 1 day, had ultrasound today and was told the HR was very good 169, length was exactly on for dates, but that my yolk sac which was 5.7 at 6 weeks 6 days is now 7.1 at 8 weeks 1 day A condition seen worldwide in chickens, turkeys and ducks due to bacterial infection of the navel and yolk sac of newly hatched chicks as a result of contamination before healing of the navel. Disease occurs after an incubation period of 1-3 days. Various bacteria may be involved, especially E. coli, Staphylococci, Proteus, Pseudomonas 5 week gestation. Yolk Sac Only seen.The yolk sac will be visible before a clearly definable embryonic pole. Mean Sac Diameter measurement is used to determine gestational age before a Crown Rump length can be clearly measured.The average sac diameter is determined by measuring the length,width and height then dividing by 3

The primary yolk sac develops due to growth of the extra-embryonic ectoderm from the ventral aspect of the embryonic disc. It cannot be visualized sonographically and soon degenerates and is replaced by the secondary yolk sac.; First structure visible within the gestational sac and is of embryonic origin They absorb the yolk sac and the umbilical scar closes up in a few days. Sep 18, 2012 #6 J. JoeImhof Member. 5 Year Member. Joined Nov 6, 2009 Messages 77. Thanks guys. Sounds like he will be ok. I'll take good care of him next few days. Thanks! Sep 18, 2012 #7 ALDABRAMAN KEEPER AT HEART. 10 Year Member! Joined Nov 5, 201 The yolk sac is still out, no much, but its out. Its not bloody or dark or anything anymore either. That's not the problem. The problem is he is a strong little guy, and he's actually trying to crawl around! He's peeping, and when I opened it this morning to make sure it hadn't dried out, he crawled over to the side and was peeping at me and. Yolk sac •Imaged ~ 5 - 5.5 w •Imaged when MSD ~ 5-6 mm •Imaged 3-5 d prior to embryo •Diameter peaks at 6 mm at 10 w, then decreases •Usually not visible after first trimester •Number of yolk sacs usually equals number of amnion

What is a Yolk Sac? - Definition from FertilitySmart

Sequential appearance of yolk sac, embryonic heartbeats and amniotic membrane was essential for normal pregnancy. The largest yolk sac in viable pregnancies was 8.1 mm. Findings in anembryonic gestations included an absent yolk sac, an irregular-shaped yolk sac and a relatively large yolk sac (> 95% upper confidence limits, in 11 cases) tre of the yolk sac wall (fig. 3) [43] . I n our hospital we routinely offer an ultrasound scan at 11-13 weeks in the fetal medicine unit (FMU) as part of the 1st trimester Fig. 1. U ltrasound pictures illustrating the measurement of embryonic length. In pregnancies at less than 7 weeks of gesta-tion, the embryonic crown and rump can

I'm 7 weeks and 6 days pregnant (according to an app) based on my lmp. I had confirmed my pregnancy by 5 hpts and 1 blood test. Today was my first visit with the OB. We did the ultrasound, we saw the uterus and yolk sac but no fetal pole. I asked the doctor if it indicates an ectopic pregnancy and the doctor said that the yolk sac is inside the. 3rd week: (a) Blood formationt First formed in the extra-embryonic mesoderm covering the wall of the yolk sac, until hemopoietic activity begins in the liver during 6th week 4th week: endoderm of yolk sac is incorporated into the embryo to form primordial gut Epithelium of Respiratory system &G.I.T. (b)Primordial germ cells in the endodermal.

Yolk sac nutrient composition and fat uptake in late-term

DOI: 10.1387/ijdb.093039hu Corpus ID: 7900887. The origin and fate of yolk sac hematopoiesis: application of chimera analyses to developmental studies. @article{Ueno2010TheOA, title={The origin and fate of yolk sac hematopoiesis: application of chimera analyses to developmental studies.}, author={H. Ueno and I. Weissman}, journal={The International journal of developmental biology}, year={2010. The yolk sac is another structure outside the embryo that aids in the embryo's development. The fetal pole is the beginning stage of the embryo that appears like a thick shape attached to the yolk sac. Gestation Timing Errors . In very early pregnancy, especially during a first ultrasound, a smaller-than-expected gestational sac could simply.

Yolk Sac Tumor - an overview ScienceDirect Topic

Yolk sac definition is - a membranous sac of most vertebrates that encloses the yolk, is attached in most forms (as in humans) through the yolk stalk with the intestinal cavity of the embryo, and is supplied with blood vessels that transport nutritive yolk products to the developing embryo (a) The yolk sac (arrow) is an eccentric round echogenic ring within the gestational sac. The MSD is 12 mm, projecting to a gestational age of 5 weeks 6 days. (b) The yolk sac is seen as two parallel lines—representing the leading edge and posterior wall—within a small gestational sac. The MSD is 4 mm, projecting to a gestational age of 5 week Vaginal yolk sac tumor is a rare malignant germ-cell tumor occurring most commonly in young girls. The treatment has evolved over the last 3 decades from radical surgery to conservative surgery with chemotherapy to chemotherapy alone. Here we present a case of a 6-month-old girl successfully treated with upfront surgery followed by chemotherapy Yolk Sac: The yolk sac (or sack) is a membranous sac attached to the embryo and formed by cells of the hypoblast. The yolk sac provides nourishment to the early embryo. After the tubular heart forms and starts pumping blood during the third week after fertilization, the blood circulates through the yolk sac, where it absorbs nutrients before. yolk sac. membranous sac attached to an embryo, formed by cells of the hypoblast adjacent to the embryonic disk. Upload media. Wikipedia. Subclass of. extra-embryonic structure. Material used. egg yolk. Authority control

Yolk Sac During Pregnancy, What is, Why You Need and Where

Formation of Germ Layers and Early Derivatives

Yolk Sac Tumors - ISUO

Yolk sac. An extraembryonic membrane which extends through the umbilicus in vertebrates. In some elasmobranchs, birds, and reptiles, it is laden with yolk which serves as the nutritive source of embryonic development. In mammals, as in birds, the yolk sac generally develops from extraembryonic splanchnopleure, and extends beneath the developing. Blood islands are structures around the developing embryo which lead to many different parts of the circulatory system. Blood islands arise external to the developing embryo on the umbilical vesicle, allantois, connecting stalk and chorion.They are also known as Pander's islands or Wolff's islands, after Heinz Christian Pander or Caspar Friedrich Wolff.. معنی yolk sac به فارسی, (جنین شناسی) کیسه زرده دورتادور جنین جاوا اسکریپت در مرورگر شما غیر فعال می باشد و جهت استفاده از تمام امکانات فست‌دیکشنری باید آن را فعال نمایید An abnormality in the sonographic appearance of a yolk sac can predict subsequent embryonic death or abnormalities. Therefore, the accurate recognition of normal and abnormal sonographic findings concerning the yolk sac can be used to anticipate the course of pregnancy. Volume 31, Issue 1. January 2012. Pages 87-95 Exam: First Trimester (Transvaginal Ultrasound) Gestational Sac (5 weeks gestation, bHCG 1800) Round echolucent (black) sac with echogenic ring located in fundus. Age on mean diameter: (length + width + height)/3. Yolk Sac (6 weeks gestation) Small echogenic walled round sac within Gestational Sac. May appear more as '=' sign rather than circle

Origin and function of the yolk sac in primate embryogenesi

  1. Define yolk sac. yolk sac synonyms, yolk sac pronunciation, yolk sac translation, English dictionary definition of yolk sac. n. A membranous sac attached to the embryo and enclosing the yolk in egg-laying vertebrates
  2. Omphalitis is a noncontagious infection of the navel and/or yolk sac in young poultry. It is more likely in unclean environments, which allow opportunistic bacterial infection. Signs include navel inflammation, anorexia, depression, reduced weight gain, and increased mortality in the first 2 weeks after hatching
  3. The yolk sac arises in the early stages of embryonic development, usually by means of the overgrowing of the yolk with endoderm and with the visceral layer of the lateral plates, and consists of an enlarged outgrowth of the midguts, the cavity of which in the majority of animals (except higher mammals and man) is filled with unbroken yolk
  4. Yolk sac. Chorion. The fetus receives oxygen and nutrients by way of the Umbilical arteries Umbilical vein Yolk sac Allantoids Amnion. Umbilical vein. What is the developmental fate of 9? forms the embryo forms the decidua parietalis forms the trophoblast forms the chorion forms the placenta. amnion
  5. In fetal circulation, blood bypasses the lungs by flowing through. A. the umbilical vein and umbilical arteries. B. the fossa ovalis and umbilical arteries and vein. C. the foramen ovale and ductus arteriosus. D. the ductus venosus and ductus arteriosus. E. the ligamentum venosum and ligamentum arteriosum
  6. utes. To stay logged in, please refresh the page or, if you are working on a form, click on the submit button to save your work

Video: yolk sac Repropedi

Embryonic Vesicle (Primary yolk sac) Round or oval. 1-2mm (4 weeks 2 days gestational age), and grows to 2-4mm at 32-35 days and is 5mm at 36-37 days (menstrual age). Ring of decidualized endometrium. Small gestational sac prior to visualization of the yolk sac or embryo. Note the. The case is presented of a patient who was hospitalized for the investigation of an anterior mediastinal mass, which proved to be a yolk sac tumour. The patient was a 33 year-old male non smoker who presented at the emergency respiratory department with a one month history of persistent dry cough.. We would like to show you a description here but the site won't allow us The extraembryonic membranes are the yolk sac, amnion, allantois, and chorion. The yolk sac is a layer of tissue growing over the surface of the yolk. Its walls are lined with a special tissue which digests and absorbs the yolk material. The amnion is a transparent sac filled with a colorless fluid The yolk sac nourishes the embryo and also helps produce blood cells during the early stages of pregnancy. The yolk sac is surrounded by a larger black area, known as the gestational sac. The.

Second Week (Days 8-14) - University of Michiga

  1. The yolk sac is first visible at 5 weeks and it is always present by 5 weeks and 4 days. There are lacunary structures [cavities or spaces] at the site of implantation. The embryonic pole appears adjacent to the yolk sac, soon showing cardiac activity. Since the connecting stalk is short, the embryonic pole is found near the wall
  2. In early spring, yolk-sac fry, or alevins, hatch. The tiny fish carry a food supply (a sac of egg yolk) attached to their bellies. They will not leave the protection of the gravel until the yolk is used up, 12 weeks or more. At that time, the young salmon, now called fry, swim up to the surface, gulp air to fill their swim bladders, and begin.
  3. yolk sac chorion, and allantois. In birds and most reptiles, the embryo with its extraembryonic membranes develops within a shelled egg. The amnion protects the embryo in a sac filled with amniotic fluid. The yolk sac contains yolk — the sole source of food until hatching. Yolk is a mixture of proteins and lipoproteins
  4. in, yolk sac specific. This antibody reacts only with parietal yolk sac la

The chorion is the membrane that covers the amnion, the yolk sac and the allantois. The space delimited by the chorion and the amnion is called the amniotic cavity and it is filled with amniotic fluid. The amniotic cavity has the function of preventing the drying out of the embryo and protecting it against mechanical shocks If a yolk sac was seen initially, 8.8% (5/57) of embryos were viable when a yolk sac was the only structure seen on repeat scan and 4.8% (4/84) if an embryo with no heartbeat was seen on repeat scan. If an embryo without heart activity was seen on an initial scan, the viability rate was 0% when there was still no heartbeat visible on repeat.

Extraembryonic Structures and Chick Embryo Embryolog

  1. Human embryonic development involves transition from yolk sac (YS) to liver (L) hemopoiesis. We report the identification of pluripotent, erythroid, and granulo-macrophage progenitors in YS, L, and blood from human embryos. Furthermore, comprehensive studies are presented on the number of hemopoietic progenitors and precursors, as well as of.
  2. IPUV was defined as an empty gestational sac with or without a yolk sac but no embryo seen with MSD < 20 or < 30 mm (depending on center) or an embryo with no heartbeat and CRL < 6 mm or < 8 mm (depending on center). Scans were repeated 7-14 days later. The endpoint was viability at first-trimester screening ultrasonography between 11 and 14.
  3. An art trading gam
  4. As soon as the yolk sac of the hatchling is absorbed it is known as spawn. At this stage the mouth is formed and it starts taking small zooplankton like rotifers and supplementary feed like egg yolk, finely powdered oil cake, rice bran etc. Fry. As soon as the spawn assume the shape of the fish and grow to about 1-2 cm it is known as fry
  5. A yolk sac can be visible around 5.5 weeks gestational age with a transvaginal ultrasound. The yolk sac provides nutritional support for the developing embryo until the placenta is formed. It is the only element that can confirm a live intrauterine pregnancy until an embryo can be visualized
  6. Interplay between SOX7 and RUNX1 regulates hemogenic endothelial fate in the yolk sac. Andrew J Lilly, Guilherme Costa, Anne Largeot, Muhammad Fadlullah Wilmot, Michael Lie-A-Ling, Georges Lacaud, Valerie Kouskoff. School of Medicine, Dentistry and Biomedical Sciences
  7. ing ti

A review on yolk sac utilization in poultry - ScienceDirec

  1. ated yolk sac and it's associated blood supply are pumping through the neonate, the greater the chances for sepsis and subsequent death so thus the need for speed yet precision
  2. Yolk was born out of frustration - in London, a city of culinary excellence, why should grab-&-go be so dull? Bored by bland staples and 'healthy' chains, we longed for a takeaway option that doesn't compromise on excitement. And so, after years of pop-ups and thousands of test kitchen hours, we opened our first Yolk
  3. g the lining of the digestive tract.1
  4. hcg levels rising, no yolk sac. erinelizabeth. Here is my background info: Aug. 22- positive blood test. hcg level 21. Aug. 25 - started bleeding. went to emergency room. hcg level 69. u/s done showed no indication of pregnancy. doctor said i already miscarried or was about to. I only bled for one day. this was a friday, i was done bleeding by.

Yolk sac macrophage progenitors traffic to the embryo

PPT - Fetal Membranes PowerPoint Presentation, freeThe fate of the vitelline and umbilical veins during theDifference Between Frog and Chick Gastrulation | CompareFate mapping reveals that microglia and recruited monocyteDevelopment of Heart

The key difference between epiblast and hypoblast is that epiblast is one of the two layers of the embryonic disc that forms three primary germ layers (ectoderm, definitive endoderm, and mesoderm), amnionic ectoderm, and extraembryonic mesoderm, while hypoblast is the second layer of the embryonic disc that forms the yolk sac.. Fertilization is the process of uniting an egg cell with a sperm. Small sac-like structure that forms the yolk sac and protrudes into the connecting stalk during the 3 rd week of development; The fetal bladder develops at the transition from the allantoic epithelium to the endoderm of the hindgut. Vitelline duct. Connects the midgut to the yolk sac; Obliterates during 6-7 th wee yolk. (yōk) n. 1. a. The portion of the egg of egg-laying vertebrates, such as reptiles and birds, and of certain invertebrates that consists chiefly of protein and fat and serves as the primary source of nourishment for the early embryo. b. This portion of the egg of a bird, especially a chicken, which is large, yellow, and surrounded by albumen Rak pęcherzyka żółtkowego, guz pęcherzyka żółtkowego, rak zarodkowy typu dziecięcego (ang. yolk sac tumor, yolk sac carcinoma, endodermal sinus tumor) - najczęstszy typ nowotworu zarodkowego jądra u niemowląt i dzieci (znany również pod nazwą orchidoblastoma).Postać dziecięca występuje najczęściej przed ukończeniem 24. miesiąca życia

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