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GA2 Test 2 Embryo

QuestionAnswer
____________ EARLIEST branchial arch composition of the posterior 1/3 of the tongue Mesoderm from the 2nd, 3rd & 4th Arches
Anomaly formed when part of the vitelline duct persists at the apex of the primary intestinal loop Meckels Diverticulum
Artery whose branches supply the derivatives of the caudal foregut Celiac Artery
Artery whose branches supply the derivatives of the midgut. Superior Mesenteric Artery
Artery whose branches supply the derivatives of the hindgut. Inferior Mesenteric Artery
Branchial arch composition of the anterior 2/3 of the tongue Mesoderm of the Ventral Mandibular (1st) Arch
Briefly describe an omphalocele. How does it occur (develop)? Anomaly of herniation, when mid-gut fails to return and is covered by amnion in the umbilical cord.
Briefly, what happens to the endodermal epithelium of the esophagus and intestine in the second month of development Luminal Obliteration followed by recavitation.
Describe (do not draw) the DEGREES and DIRECTION of rotation of the midgut while it is in the herniated position inside the umbilical cord only. Primary Intestinal Loop rotates 90 Degrees counter-clockwise around the axis of the superior mesenteric artery. Causes the cephalic limb to move to the right and the caudal limp to move to the left.
Discuss in detail the development of an INTERNAL branchial fistula. Abnormal regression of the tissue between the 2nd arch & 2nd Pouch
Discuss in detail the formation of a cervical sinus 2nd Branchial arch grows caudally overlaping the 3&4 Branchial arches, 2nd arch fuses with Epicardial Ridge Thus, 2nd, 3rd, 4th clefts are buried forming the cervical sinus.
Discuss the development of the falciform ligament and lesser omentum Liver grows out of the septum transversum, the mesoderm that is pulled out then becomes lesser omentum and falciform ligaments.
Discuss the rotational movements of the STOMACH. 90 Degress clockwise on vertical axis & clockwise on Anteroposterior (A to P) axis
Draw 2 diagrams (x-sections through the gut loop) showing positional changes of the proximal (cephalic) limb of the primary intestinal loop during REDUCTION (return) of the midgut hernia ONLY. Draw Diagrams
Exactly where does the midgut end in the ADULT? Junction of Right 2/3 and left 1/3 transverse colon
Explain why the right recurrent laryngeal n. loops under the right subclavian a. but the left loops under the arch of the aorta. BE SPECIFIC AND COMPLETE! Distal part of Right 6th arch drops out allowing the right recurrent laryngeal to move up underneath the right 4th aortic arch.
From what embryonic components do the following parts of the liver develop? Be sure to also mention the germ layer in your answer. a) parenchyma (functional part) b) Connective tissue a) Gut Endoderm b) Mesodermal partition of septum transversum
Give the derivatives if any of : (BE SPECIFIC) a) distal part of right 6th aortic arch- b) left 4th aortic arch- c) 3rd aortic arch- a) regresses b) Part of Aortic Arch between left common carotid & left subclavian artery c)Common carotid arteries and proximal 1/3 of internal carotid arteries
Give the derivatives if any of : (BE SPECIFIC) a) right 4th aortic arch- b) left 1st aortic arch- a) Proximal Part of Subclavian Artery b) regresses
Give the embryonic component that forms: a) the left subclavian artery b)the portion of the right subclavian IMMEDIATELY proximal to the vertebral artery a) Left 7th Intersegmental artery b) Right 4th aortic arch & some of right dorsal aorta
Give the embryonic derivation of the INTERNAL carotid a. Proximal 1/3 - 3rd Aortic Arch & Distal 2/3 - Anterior Extensions of dorsal aortae
Give two structures derived from the CAUDAL limb of the primary intestinal loop. Ascending Colon, Cecum (distal 2-3 feet of ileum & proximal right 2/3 transverse colon)
In detail, how does a left- sided cecum develop? Only the 1st 90 degree counter-clockwise rotation occurs instead of the 270 degree counter-clockwise rotation.
List the degrees and direction of rotation of the gut during its RETURN to the abdominal cavity ONLY. 180 Degrees counter-clockwise
List the EMBRYONIC components that collectively form the definitive ARCH of the AORTA 1. Aortic sac 2. Left 4th Arch 3. Left Dorsal Aorta
Name two derivatives of the CAUDAL limb of the primary intestinal loop Distal 2-3 feet of ileum, cecum, ascending colon, proximal right 2/3 of transverse colon
Name the ADULT derivatives of the following: a) 2nd cleft b) 2nd pouch c) Ventral 3rd pouch d) Copula (hypobranchial eminence) a) No derivatives b) tonsilar fossa & palatine tonsils c)Thymus d)Posterior 1/3 of tongue
Name the ADULT derivatives of the following: a) dorsal fourth pouch b) third cleft a)Superior Parathyroid b) Regresses - No Derivatives (2,3,4 can produce cervical sinus)
Name the ADULT derivatives of the following: a) Dorsal third pouch b) Ventral 4th pouch a) Inferior Parathyroid b) Ultimobranchial body
Name the ADULT derivatives of the following a) dorsal 3rd pouch b) first pouch a) Inferior Parathyroid b) tubotympanic recess containing, typanic cavity, auditory tube & tympanic membrane
Name the primordium (NOT arches) responsible for each part of the tongue listed below: a) Anterior 2/3rds b) Posterior 1/3rd a) Lateral Lingual Swellings B) Copula (Hypobranchial Eminence)
Name two derivatives of the CEPHALIC limb of the primary intestinal loop Distal part of the duodenum, jejunum, jejunum and most of ileum
Name two FETAL vessels which carry highly oxygenated blood and close at birth. What adult structures do they form? Umbilical Vein - Ligamentum Teres Hepatis & Ductus Arteriosus - Ligamentum Arteriosum
SPECIFICALLY, how does a structure become secondarily retroperitoneal? A structure becomes retroperitoneal when its mesentery fuses with the posterior wall of the abdomen.
Specifically, where does the midgut end in the adult? Between the Right 2/3 and Left 1/3 of transverse colon
Specifically, where does the hindgut end in the adult? Pectinate Line of Anal Canal
The brachiocephalic artery specifically develops from what embryonic component? Aortic Sac of the Truncus Arteriosus
What develops from the: a) right 4th aortic arch b) left 2nd aortic arch a) Proximal Part of Right Subclavian b) Regresses except for small stapedial and hyoid arteries
What happens to: a) 2nd aortic arch b) Distal left 6th arch a) Regresses b) Forms ductus arteriosus
When (week) and why does the midgut undergo physiological umbilical herniation? 6th week, due to rapid growth of cephalic limb the abdominal cavity is temporarily too small
Created by: Brooke Breitbach Brooke Breitbach on 2011-06-19



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