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Embryo for Exam 3
| Question | Answer |
|---|---|
| Mesenchyme immediately peripheral to the dentin of the ROOT of a developing tooth forms what two components | Periodontal membrane Cementum |
| Give the name of the embryonic component (not germ layer or cells) that specifically forms: a) enamel b) dental cuticle | a) inner dental epithelium b) stellate reticulum |
| True or False? The PRIMITIVE choanae are located behind the primary palate | TRUE |
| True or False? Paranasal sinuses are formed when bones are excavated | TRUE |
| True or False? Surfactant is produced at 7 months of fetal development | TRUE |
| True or False? In tracheoesophageal fistula, rarely do both the proximal and distal parts of the esophagus open into the trachea | TRUE |
| True or False? By the time the lung reaches adult maturity, a total of 17 generations of subdivisions form the bronchial tree | FALSE. 6 more added |
| IN DETAIL, discuss how the pancreas becomes retroperitoneal | Dorsal mesoduodenum on the right and dorsal mesogastrium on the left fuse together at the dorsal body wall |
| During the development of the arteries within the limb bud, a main ventral _______(?) vessel develops by enlargement and consolidation of the capillary plexus vessels | Axial |
| Name the ADULT arteries which develop from the vitellines | Celiac, Superior Mesenteric, Inferior Mesenteric |
| Besides the medial umbilical ligaments, give the derivatives of the embryonic umbilical arteries | Umbilical arteries, superior and middle vesicle arteries, internal iliac arteries |
| What specific embryonic vessels (give right or left if necessary) give rise to: a) hepatic sinusoids b) suprarenal veins c) hepatic veins | a) vitelline veins b) subcardinal veins c) Right proximal vitelline vein |
| Name the adult components formed from the primary head vein | Superficial layer- dural venous sinuses Deep layer- cerebral veins |
| What specific embryonic vessels (give right or left if necessary) give rise to: a) oblique vein of Marshall b) gonadal veins | a) left common cardinal b) subcardinal veins |
| Using the terms REGRESSES and PERSISTS, give the fate of the right and left proximal and distal segments (distal=that part toward the placenta) of umbilical veins. a) left umbilical b) right umbilical | (Proximal) (Distal) a) Left umbilical regresses persists b) Right umbilical regresses regresse |
| What specific embryonic vessels (give right or left if necessary) give rise to: a) right renal vein b) proximal left renal vein | a) intersubcardinal vein anastomosis b) intersubcardinal vein anastomosis |
| What specific embryonic vessels (give right or left if necessary) give rise to: a) internal jugular vein b) distal left renal vein | a) cranial parts of Right and Left precardinal b) sub-supracardinal vein anastomosis |
| Briefly discuss the formation of the left brachiocephalic vein | oblique anastomosis of Right and Left precardinal veins |
| PRINT the WORD true or false in front of each statement ______ ectopic lung lobes arise from the trachea or esophagus ______ at birth the tracheal bifurcation lies at T4 | TRUE TRUE |
| T/F only about 1/6 of the adult alveoli are present at birth | TRUE |
| T/F the laryngotracheal groove develops from the pharynx during the 4th week of development | TRUE |
| T/F Surfactant is produced at 7 months of fetal development | TRUE |
| T/F Endoderm gives rise to the epithelium, but not connective tissue of the larynx, bronchi, and lungs | TRUE |
| T/F in tracheoesophageal fistula, there is usually an additional fibrous cord attached to the larynx | FALSE |
| What embryonic component of the 'bell' stage of tooth development gives rise to: BE SPECIFIC and COMPLETE a) the cells that form the pulp- b) dentin(odontoblasts)- | a) inner mesenchyme of dental papilla b) outer mesenchyme of dental papilla |
| IN DETAIL. Why does the stomach rotate clockwise around its vertical axis? | The dorsal mesentery of the omental bursa grows and lengthens and is pushed to the left due to clefts on the right of the dorsal mesentary |
| SPECIFICALLY from what does the infracardiac bursa develop? SPECIFICALLY, where is it located? | The superior recess of the omental bursa above diaphragm, cyst can develop posterior to root of lung |
| IN DETAIL, discuss how the pancreas becomes retroperitoneal. BE SPECIFIC | The right side of the dorsal mesoduodenum and the left side of the dorsal mesogastrium fuse with the dorsal body wall |
| Discuss the development of the vertebral artery | The dorsal ramus of the dorsal intersegment fuse via anastomosis between #1-7 forming the vertebral artery |
| Discuss the development of the inferior vena cava. Include segments and embryonic vessels responsible. (Use right or left if necessary) | Right sub cardinal-pre renal Rght supracardinal- post renal Right sub-supracardinal anastomosis- Renal Common Hepatic- Hepatic portal |
| What specific embryonic vessels (give right or left if needed) form: a) hepatic veins b) left brachiocephalic vein c) segment of the inferior vena cava d) superior vena cava e) hemiazygos, accessory hemiazygos, and most of azygos | a) Right vitelline b) oblique anastomosis, between Left and Right pre cardinals c) right sub-supracardinal anastomosis d) right common cardinal and right precardinal up to oblique e) supracardinal vein |
| Name the components which comprise the ventral mesentery | Falciform ligament, lesser omentum |
| SPECIFICALLY from what does the infracardiac bursa develop? SPECIFICALLY, where is it located? | Superior recesses of the omental bursa grow cranially, to the right lung bud, this becomes the infracardiac bursa. - It is located above the diaphragm |
| Name the ADULT arteries which develop from the VENTRAL rami of dorsal intersegmentals | Intercostal arteries, lumbar arteries, common iliac arteries |
| Concerning development of the portal vein: a) what embryonic vein(s) are responsible for its formation? b) what specific part(s) of the vein(s) remain to form the portal? | a) Right and left vitelline veins b) The right limb of the cranial ring and middle(dorsal) anastomosis |
| Discuss in DETAIL the development of the ductus venous. Be complete and specific. | The liver grows laterally to the umbilical veins and allows for a more direct route to the heart. The left umbilical vein and the right vitelline vein eventually form the ductus venosus |
| For EACH below, name two ADULT arteries which develop: a) lateral segmentals b) ventral segmentals | a) inferior phrenic artery, suprarenal artery, renal artery, and testicular artery/ovarian b) internal iliac arteries, umbilical arteries, superior and middle vesical arteries |
| Specifically, how and where does the omental bursa BEGIN its development? | Intracellular clefts from the right of the dorsal mesogastrium |
| T/F at birth the tracheal bifurcation lies at T4 | True |
| T/F the oronasal membrane lies just behind the secondary palate | False |
| T/F endoderm forms the epithelium of the paranasal sinuses | False |
| T/F Ectopic lung lobes arise from the trachea or esophagus | True |
| T/F surfactant is produced at seven months of fetal development | True |
| T/F the primitive choanae are located behind the primary palate | True |
| Discuss in detail the development of the ductus venous. Be complete and specific | -liver expands laterally and contacts umbilical vein -diagonal blood flow between lumbillar vein and right vitelline vein becomes ductus venosus |
| Name the components that comprise the ventral mesentery | Falciform ligament Lesser omentum |
| T/F at birth the tracheal bifurcation lies at T4 | True |
| T/F the oronasal membrane lies just behind the secondary palate | False. it lies behind the primary palate |
| T/F endoderm forms the epithelium of the paranasal sinuses | False. the ectoderm does |
| T/F ectopic lung lobes arise from the trachea or esophagus | True |
| T/F surfactant is produced at 7 months of fetal development | True |
| T/F the PRIMITIVE chonae are located behind the primary palate | True |
| What lymphatic sacs may be responsible for: a) deep cervical nodes b) lumbar nodes | a) Jugular sacs b) Retroperitoneal sacs |
| What embryonic component of the "bell" stage of tooth development gives rise to a) the cells that form the pulp b) Dentin(odontoblasts) | a) inner mesenchymal cells of the dental papilla b) the outer mesenchymal cells of the dental papilla |
| Mesenchyme immediately peripheral to the dentin of the ROOT of a developing tooth forms what two components | Periodental membrane Cementin |
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