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Arabic Videos

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Concept Article

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Question Cases

4000+

Smart Flashcards

14

Module-based assessments

2

Evaluation exams

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Study Plans

Our ready-to-use plans give you a clear roadmap that breaks complex subjects into manageable steps, keeping you focused, organized, and on track to succeed in USMLE, IMLE, NBME, and more.

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Learn key medical concepts with concise, engaging video lessons, taught in Arabic by experienced medical educators. available with your study plans or as a standalone library.

Summary Pages

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QBank & Assessments

Practice and reinforce your learning with thousands of clinical cases and realistic self-assessments, all supported by in-depth answer explanations, video lectures, and concise summary pages.

Flashcards

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Modules Breakdown

Module	Video Lectures	Review Articles	Practice Questions	Flashcards
General Pathology	17	17	48	120
General Pharmacology	18	11	48	80
Immunology	20	22	90	150
Respiratory System	37	35	280	180
Cardiovascular System	41	40	400	260
Gastrointestinal System	48	50	320	308
Renal System	32	30	240	200
Endocrine System	30	35	240	200
Reproductive System	39	50	240	250
Musculoskeletal System	43	50	320	280
Hematology	39	35	240	180
Microbiology	60	72	300	500
Nervous System	69	68	440	480
Psychiatry	25	55	200	385
Biochemistry	47	52	150	370
Biostatistics, Ethics	21	11	240	80

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Sample Summary page

Gastrointestinal Embryology

Writer: Yazan AlHabil, M.D.

Keywords: Embryology, Primitive Gut Tube, Foregut, Midgut, Hindgut, Rotation, Mesenteries, Congenital Abdominal Wall Defects

Overview

The gastrointestinal (GI) tract originates from the primitive gut tube, a structure derived from the endodermal lining of the yolk sac during early embryogenesis. Through coordinated craniocaudal and lateral folding in the 4th week of development, the gut tube forms and differentiates into distinct segments. These segments—foregut, midgut, and hindgut—each have defined vascular and neural supplies and give rise to specific GI organs.

Primitive Gut Tube (4th Week of Development)

● Formed from the endoderm of the yolk sac (Figure 1).

● Result of embryonic folding in week 4.

● Divides into three regions:

o Foregut: supplied by the celiac trunk.

o Midgut: supplied by the superior mesenteric artery (SMA).

o Hindgut: supplied by the inferior mesenteric artery (IMA).

● Surrounded by splanchnic mesoderm, which contributes to its muscle and connective tissue.

Figure 1. An illustration of the primitive gut.

Foregut, Midgut, and Hindgut Derivatives and Their Neurovascular Supply

Region	Major derivatives	Arterial supply
Foregut	esophagus, stomach, proximal duodenum, liver, gallbladder, pancreas (ventral and dorsal buds)	celiac trunk
Midgut	distal duodenum to proximal 2/3 of transverse colon	superior mesenteric artery
Hindgut	distal 1/3 of transverse colon to upper anal canal	inferior mesenteric artery

Non-Gut Tube Derivatives

● Buccopharyngeal membrane: future oral cavity.

● Cloacal membrane: forms the anal canal distal to the pectinate line.

● Dorsal mesentery: contributes to the spleen, dorsal pancreatic bud, gastrosplenic ligament, splenorenal ligament, and greater omentum.

● Ventral mesentery: forms the liver, ventral pancreatic bud, falciform ligament, and lesser omentum.

● Somatic mesoderm: gives rise to the parietal peritoneum.

● Splanchnic mesoderm: forms the visceral peritoneum.

Germ Layers of the GI Tract

Germ layer	Derivatives
Endoderm	epithelium and mucosal glands of GI tract, liver parenchyma, pancreatic parenchyma
Mesoderm	lamina propria, muscularis mucosa, submucosa, muscularis propria
Ectoderm (neural crest cells)	enteric nervous system (Auerbach's and Meissner's plexuses)

NOTE: The spleen is mesodermal in origin, despite its proximity to foregut structures.

Figure 2. The germ layers of the GI tract.

OpenStax. (2013). Fate of germ layers in embryo [Illustration]. In Anatomy and Physiology (Fig. 28.10, p. 1342). OpenStax. https://openstax.org/details/books/anatomy-and-physiology

Image retrieved from Wikimedia Commons: https://commons.wikimedia.org/wiki/File:Fate_of_germ_layers_of_the_embryo.png

Rotation of the Stomach (Foregut Rotation)

● Occurs between weeks 4–6.

● Rotates 90° clockwise along its longitudinal axis.

● Results in:

o Lesser curvature on the right (anterior).

o Greater curvature on the left (posterior).

o Left vagus nerve becomes anterior to the stomach.

o Right vagus nerve becomes posterior.

o Liver and duodenum shift to the right.

o Spleen and pancreas move to the left.

Rotation of the Midgut (Intestinal Rotation)

Week	Event	Description
4th	midgut elongation	forms a primary intestinal loop around the SMA (Figure 3).
6th	physiological herniation	midgut herniates into the umbilical cord → 90° counterclockwise rotation.
10th	return to abdomen	re-enters abdomen → 180° counterclockwise rotation.
	final positioning	total 270° counterclockwise rotation → fixation of duodenojejunal flexure and cecum.

Figure 3. Rotation of the midgut around the SMA.

(A) Formation of a hairpin loop around the superior mesenteric artery around fifth week. (B) Herniation of the midgut into the umbilicus around sixth week, and rotation 90 degrees counterclockwise around the superior mesenteric artery, (C) Return of the intestines into the abdomen around 10th week, (D) Further rotation of the intestines within the abdominal cavity around 11th week, so that the cecum is positioned in the right upper quadrant, (E) Fixation of the cecum in the right lower quadrant, thus completing intestinal rotation (270 degrees total).

Danowitz, M., & Solounias, N. (2016). Rotation of the midgut around the superior mesenteric artery [Illustration]. In Embryology, comparative anatomy, and congenital malformations of the gastrointestinal tract. Edorium Journal of Anatomy and Embryology, 3, 39–50. https://doi.org/10.5348/A04-2016-14-RA-6

Image retrieved from Wikimedia Commons: https://commons.wikimedia.org/wiki/File:Rotation_of_the_midgut_around_the_superior_mesenteric_artery.png

Congenital Malformations of the Anterior Abdominal Wall

Condition	Etiology	Features
Omphalocele (Figure 4)	failure of midgut to return into the abdomen	hernia within umbilical ring, covered by amniotic sac and peritoneum.
Gastroschisis (Figure 5)	defect in ventral abdominal wall	no covering sac, bowel exposed to amniotic fluid, typically right of umbilicus.
Congenital umbilical hernia (Figure 6)	incomplete closure of umbilical ring	protrusion covered by skin and peritoneum, often self-resolving.

Figure 4. An illustration of omphalocele.

Centers for Disease Control and Prevention, National Center on Birth Defects and Developmental Disabilities. (2012, December 11). Omphalocele drawing [Illustration]. Wikimedia Commons. https://commons.wikimedia.org/wiki/File:Omphalocele-drawing.jpg

Figure 5. An illustration of gastroschisis.

Centers for Disease Control and Prevention. (2013, November 10). Illustration of a baby with gastroschisis [Illustration]. Wikimedia Commons. https://commons.wikimedia.org/wiki/File:Gastroschisis-web.jpg

Figure 6. A photograph of a patient with congenital umbilical hernia.

Jpogi. (2009, December 31). Umbilical hernia in a 6-week-old infant [Photograph]. Wikimedia Commons. https://commons.wikimedia.org/wiki/File:Umbilical_Hernia.JPG