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Embryoq2
mash
| Question | Answer |
|---|---|
| name the adult derivatives of the following: a. dorsal third pouch b. ventral 4th pouch | a. inferior parathyroid glands b. ultimobranchial body |
| discuss formation of the cervical sinus | 2nd pharyngeal arch folds caudally, overlapping the 3rd and 4th. It then fuses with the epicardial ridge after covering the 2nd, 3rd, and 4th pharyngeal clefts |
| name the primordium responsible for each part of the tongue listed below a. anterior 2/3 b. posterior 1/3 | a. lateral lingual swellings b. copula |
| name 2 derivatives of the caudal limb of the primary intestinal loop | distal 2-3 of ileum, ascending colon, cecum, right 2/3 of transverse colon |
| name 2 derivatives of the cephalic limb of the primary intestinal loop | distal duodenum, jejunum, most of ileum |
| exactly where does the midgut end in the adult | junction of the right 2/3 and the left 1/3 of the transverse colon |
| list the degrees and rotation of the gut during its return to the abdominal cavity only | 180 deg. counter clockwise |
| discuss the development of the falciform ligament and the lesser omentum | the liver grows and protrudes into the septum transversarum. The mesoderm between ventral abdominal wall and liver becomes falciform ligment. The mesoderm between liver and stomach becomes lesser omentum. |
| From what embryonic components do the following parts of the liver develop? a. parenchyma b. connective tissue | a. gut endoderm b. mesoderm of septum transversarum |
| Artery whose branches supply the derivatives of the midgut | Superior mesentaric |
| List the embryonic components that collectively form the definitive arch of the aorta | left 4th aortic arch, aortic sac of truncus arteriosus, left dorsal aortae |
| Explain why the right recurrent laryngeal n. loops under the right subclavian a. but the left loops under the arch of the aorta. | The right 6th aortic arch regresses, allowing right recurrent laryngeal to move underneath the 4th aortic arch. |
| Specifically, where does the hindgut end in an adult | the pectinate line of the anal canal |
| Branchial arch composition of the anterior 2/3 of the tongue | ventral mandibular arch mesoderm |
| What week and why does the midgut undergo physiological umbilical herniation | week 6, because the abdominal cavity is too small for the fast growing midgut |
| Draw two diagrams showing positional changes of the cephalic limb of the primary intestinal loop during return of the midgut | |
| Anomaly formed when part of the vitelline duct persists at the apex of the primary intestinal loop | Meckel's Diverticulum |
| In detail, how does a left-sided cecum develop | the midgut only rotates 90 degrees during physiological herniation, doesn't rotate 180 degrees during return. |
| What develops from the a. left 4th aortic arch b. left 2nd aortic arch | a. aortic arch between left subclavian and left common carotid b. regresses |
| adult derivatives of the a. dorsal 4th pouch b. 3rd cleft | a. superior parathyroids b. nothing |
| artery whose branches supply the derivatives of the caudal foregut | celiac trunk |
| Briefly, what happens to the endodermal epithelium of the esophagus and intestine in the second month of development | luminal obliteration followed by recavitation |
| Briefly describe an omphalocele. How does it occur? | A herniation of the midgut out to the umbilical cord covered by amnion. The midgut herniates, returns, and then herniates again. |
| Specifically how does a structure become secondarily retroperitoneal? | The dorsal mesentary fuses with parietal peritoneum of the posterior abdominal wall. |
| Give the embryonic derivation of the ICA | distal 2/3 from anterior extension of dorsal aortae, proximal 1/3 from 3rd aortic arch |
| Discuss the development of an internal branchial fistula. | Abnormal breakdown of tissue between the 2nd branchial pouch and cleft |
| Adult derivatives of a. 2nd cleft b. 2nd pouch c. ventral 3rd pouch d. copula | a. nothing b. palatine tonsil and fossa c. thymus d. posterior 1/3 of tongue |
| discuss the rotational movements of the stomach | rotates 90 deg. clockwise around the vertical axis, clockwise on AP axis |
| Adult derivatives of a. 2nd aortic arch b. distal left 6th arch | a. regresses b. ductus arteriosus |
| Earliest branchial arch composition of posterior 1/3 of the tongue | mesoderm from arches 2,3,4 |
| The brachiocephalic artery specifically develops from what embryonic component? | aortic sac of truncus arteriosus |
| Derivatives of a. right 4th aortic arch b. left 1st aortic arch | a. proximal part of right subclavian a. b. regresses |
| give the derivatives of: a. distal part of right 6th aortic arch b. left 4th aortic arch c. 3rd aortic arch | a. ductus arteriosus b. arch of aorta between left subclavian and left common carotid c. common carotid and proximal 1/3 of ICA |
| Embryonic component that forms: a. left subclavian artery b. portion of the right subclavian immediately proximal to the vertebral a. | a. left 7th intersegmental a. b. right dorsal aorta |
| Adult derivatives of the following: a. 2nd cleft b. 2nd pouch c. ventral 3rd pouch d. copula | a. regresses b. palatine tonsil and fossa c. thymus d. posterior 1/3 of tongue |
Created by:
cooandrew
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