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WVSOM -- Anatomy
GI Tract Development
| Question | Answer |
|---|---|
| What are the 3 main branches of the celiac trunk? (Foregut) | Splenic Artery Left Gastric Artery Common Hepatic Artery |
| Splenic Artery | A -- Short gastric aa B -- Left gastroomental aa |
| Common hepatic artery | 1 - Proper hepatic artery 2 - Gastroduodenal artery |
| Proper Hepatic | heads to liver gives off right gastric artery |
| Gastroduodenal artery gives off | right gastroomental and pancreaticoduodenal artery |
| How are regions of the gut differentiated? | Based upon their blood supply |
| What are the 3 regions of the gut? | Foregut Midgut Hindgut |
| Midgut arterial supply | Superior mesenteric artery |
| 5 main branches of the superior mesenteric artery | Middle colic artery Right colic artery Ileocolic artery Jejunal aa. Ileal aa. |
| Foregut contains | Abdominal esophagus stomach proximal duodenum liver pancreas gallbadder spleen |
| Midgut contains | distal duodenum jejunum ileum cecum appendix ascending colon proximal 2/3 transverse colon |
| Hind gut contains | Distal 1/3 transverse colon descending colon sigmoid colon rectum |
| Middle colic artery gives off | marginal artery |
| Ileocolic artery gives off | posterior cecal artery appendicular artery |
| Ileal aa gives off | loops and arcades, vasa recta |
| Loops and arcades and vasa recta are important for | absorption |
| More loops and arcades in the __________ than the ____________. | Jujenum; ilium |
| Hindgut arterial supply | inferior mesenteric artery |
| Inferior mesentaric artery gives off | left colic artery Sigmoid artery superior rectal artery |
| Left colic artery gives off | marginal artery |
| Venous Drainage | Caval circulation Portal circulation |
| Caval circulation | Drains structures associated with abdominal wall (kidneys, gonads, musculature). Drains into the inferial vena cava |
| Caval circulation is made up of: | Single and Paired veins |
| Single Caval Veins | Medial Sacral Vein |
| Paired Caval Circulation | Inferior phrenic vein Renal vein Gonadal vein Common Iliac vein Lumbar vein |
| Portal circulation is made up of : | portal vein Portocaval anastomoses |
| How many lumbar veins? | 2-4 |
| Portal vein gives off | Superior mesenteric vein splenic vein left and right gastric vein inferior mesentaric vein |
| Inferior mesentaric vein gives off | superior rectal vein |
| Beginning of gut formation | Week 4 Tube from the oropharynx to cloaca |
| The endoderm makes up the _____________, ____________, and ____________. | lines of gut tube Pancreas Liver |
| Splanchnic mesoderm makes up | muscular and connective tissue associated with the gut |
| Tissue that covers teh gut tube is called the | Peritoneum |
| A double later of the peritoneum that attaches to the gut tube to the body is called ________. | mesentery |
| _______ attaches gut tube to dorsal body wall | Dorsal Mesentary |
| ____________ attaches gut tube to the ventral body wall. | Ventral mesentary. |
| Attaches from tube to tube or tube to wall | Ligament |
| Most of teh GI tract is ___________ | Intraperitoneal |
| Intraperitoneal | surrounded by peritoneum |
| Retroperitoneal | only the anterior surface is covered by peritoneum |
| Are retroperitoneal organs mobile? | no |
| Forgut embryonology | 1. Anterior-posterior outgrowths 2. Stomach rotates 90 degrees 3. 1st part of duodenum |
| Anterior-posterior outgrowths | Dorsal -> greater curvature Ventral -> lesser Curvature |
| Dorsal mesentery gives off | spleen and pancreas (corsal and ventral buds) Greater omentum |
| When teh stomach rotates 90 degrees | Liver rotates to right hand side Spleen rotates to the left side |
| ______________ forms the boundary of _____________ | Greater Omentum;Omental bursal |
| Omental bursa | hole |
| Lesser curvature is on the | right hand side3 |
| lesser omentum has _____________ leading to the lesser sac | omental foramen (foramen of winslow) |
| 1st part of duodenum remains ___________ but the rest becomes ____________ | intraperitoneal retroperioneal |
| Transition to the midgut is where the ________ enters into the duodenum | common bile duct |
| The liver and gall badder develop from _______ | the foregut as an outgrowth, the hepatic diverticulum |
| Pancreas develops from the | dorsal and ventral pancratic buds |
| The spleen develops withing | the dorsal mesogastrium |
| Forgut undergoes a ______ clockwise rotation | 90 degree |
| Most of the duodenum becomes | retroperitoneal |
| Midgut Embryology I | U-shaped tube extends out to teh umbilcal cord U- tube rotates counterclockwise 90 degrees |
| Midgut Embroyology II | U-Tube begins to return to the abdominal cavity Rotates another 180 degrees duodenum becomes secondarily retroperitoneal |
| Problems that can occur with midgut formation | Malrotation (volvulus) Omphalocele |
| Midgut embryology summary | midgut herniates out to umbilical cord rotates a total of 270 degrees counterclockwise |
| Hindgut embryology summary | Next block cloaca differentiates into teh UG and GI systems |
| Innervation of teh gut | Mostly autonomic (except esophagus) |
| Sympathetic Nerves | Greater, lesser, least, and lumbar splanchnic nerves |
| Parasympathethic nerves | Vagus nerve and Pelvic splanchnic nerve |
| Foregut Innervation sympathetics | greater splanchnic nerve synapses with the celiac ganglion following the celiac trunk and its division |
| Midgut Innervation Sympathetics | Lesser adn least Splanchnic Nerve synapsing with the superior mesentary and aortecosttal gaglia.They follow the superior associated arteries. |
| Foregut Innervation parasympathetics | Vagus nerve and the afferent sensory is T6-T12 |
| Midgut Innervation parasympathetics | Vagus nerve and the afferents follow spinal cord levels |
| Hindgut innervation sympathetics | least splanchnic Nerve that synapses in the inferior mesentaric and hypogastric plexus that follows the blood supply. |
| Hindgut innervation of parasympathetics | Pelvic Splanchnic off of S2-S4. Afferent nerves run to T12-S4 |
Created by:
tjamrose
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