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Embryo 3
| Question | Answer |
|---|---|
| Mesenchyme immediately peripheral to the dentin of the root of a developing tooth forms what two components? | 1. Periodontal membrane 2. Cementum |
| Give the name of the embryonic component (not germ layer or cell) that specifically forms: a) enamel b) dental cuticle | a)Inner dental epithelium b) stellate reticulum |
| The trachea develops from: a. endoderm b. ectoderm c. mesoderm d. ectoderm AND endoderm e. endoderm AND mesoderm f. ectoderm AND mesoderm | e. Endoderm AND mesoderm |
| Which one of the following statements is false? a. The primitive choanae are located behind the primary palate b. paranasal sinuses are formed when bones are excavated c. surfactant is produced at 7 months of fetal development | SEE NEXT CARD |
| d. in tracheoesophageal fistula, rarely do both the proximal and distal parts of the esophagus open into the trachea e. by the time the lung reaches adult maturity, a total of 17 generations of subdivisions form the bronchial tree | e. By the time the lung reaches adult maturity, a total of 17 generations of subdivisions form the bronchial tree |
| Specifically, how and where does the omental bursa begin its development? | As clefts in the right side of mesogastrium |
| In detail, discuss how the pancreas becomes retroperitoneal. | When the left side of dorsal mesogastrium and right side of dorsal mesoduodenum fuse with the dorsal body wall, the pancreas becomes secondarily retroperitoneal. |
| During the development of the arteries within the limb bud, a main central ________ vessel develops by enlargement and consolidation of the capillary plexus vessels. | Axial |
| Name the ADULT arteries which develop from the vitellines | 1. Celiac 2. Superior and Inferior Mesenteric |
| Besides the medial umbilical ligaments, give the derivatives of the embryonic umbilical arteries. | 1. Internal Iliac aa. 2. Umbilical aa. 3. Superior and middle vesical aa. |
| What specific embryonic vessels give rise to: a) hepatic sinusoids b) suprarenal veins | a) Vitelline vv. b) Subcardinal vv. |
| Name the adult components formed from the primary head vein. | 1. Superficial layer -> Dural Venous Sinuses 2. Deep layer -> Cerebral Veins |
| What specific embryonic vessels give rise to: a) oblique v. of Marshall b) gonadal vv. | a) L. common cardinal b) Subcardinal vv. |
| Using the terms “Regresses” and “Persists”, give the fate of right and left proximal and distal segments of umbilical veins. a) left umbilical b) Right umbilical | Persists- L. Distal Umbilical Regresses- L/R Proximal Umbilical, R Distal Umbilical |
| What specific embryonic vessels give rise to: a) right renal vein b) proximal left renal vein | a) Intersubcardinal anastomosis b) Intersubcardinal anastomosis |
| What specific embryonic vessels give rise to: a) internal jugular vein b) distal left renal vein | a) Cranial parts of L. & R. precardinals b) Left sub-supracardinal anastomosis |
| Briefly discuss the formation of the left brachiocephalic vein | Formed from the oblique anastomosis between L. & R. precardinals |
| Print the word true or false in front of each statement 1._______ Ectopic lung lobes arise from the trachea or esophagus 2._______ At birth the tracheal bifurcation lies at T4 | 1. True 2. True |
| 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 mesenchyme of dental papilla →the cells that form the pulp b) Outer mesenchyme of dental papilla →Dentin (odontoblasts) |
| In detail, why does the stomach rotate clockwise around its vertical axis? | The dorsal mesentery of the omental bursa grows in length and moves to the left due to clefts on the right side of dorsal mesentery and causes the stomach to rotate 90⁰ clockwise. |
| Specifically, from what does the infracardiac bursa develop? Specifically, where is it located? | -The upper part of the superior recess of the omental bursa. - It can form a cystic structure posterior to the root of the lung above the diaphragm |
| Discuss the development of the vertebral artery | Form from anastomosis of the dorsal rami 1-7 |
| Discuss the development of the inferior vena cava. Include segments and embryonic vessels responsible. Use right or left if necessary. Both segment and embryonic vessels must be correct to receive ANY credit. | 1. Common hepatic vein & some hepatic sinusoids → Hepatic 2. Right subcardinal→ Prerenal 3. Right sub-supracardinal anastomosis→ Renal 4. Right supracardinal→ Postrenal |
| What specific embryonic vessels form: a) hepatic veins b) left brachiocephalic vein c) renal segment of the IVC d) superior vena cava e) hemiazygos, accessory hemiazygos and most of azygos | a) R. proximal vitelline→ hepatic vv. b) Oblique anastamosis → L. brachiocephalic v. c) R. sub-supracardinal anastomosis →renal segment of IVC d) R. common cardinal & R. precardinal (Up to oblique anastomosis) → SVC |
| E on next slide | e) Supracardinals →hemiazygos, accessory hemiazygous, most of azygos |
| Name the components which comprise the ventral mesentery. | 1. Falciform ligament 2. Lesser omentum |
| Concerning development of the portal vein: a) What embryonic veins are responsible for its formation? b) What specific parts of the veins remain to form the portal? | a) R. & L. vitelline vv. b) The right leg of the crainial ring and the middle (dorsal) anastomosis |
| Discuss in detail the development of the ductus venosus. Be detailed and specific. | The liver grows laterally to contact the umbilical vv. and allows for a more direct route to the heart. The connection between the L. umbilical v. and R. vitelline v. in the liver becomes the ductus venosus |
| For each below, name two ADULT arteries which develop from: a) lateral segmentals b) ventral segmentals | a) Lateral segmentals→ Inferior phrenic arteries, suprarenal arteries, renal arteries, testicular or ovarian arteries b) Ventral segmentals→ Internal iliac aa., umbilical aa., Sup. & Middle vesical aa. |
| Name the ADULT arteries which develop from the VENTRAL rami of dorsal intersegmentals | Ventral rami of dorsal intersegmentals→ 1. Intercostal aa. 2. Lumbar aa. 3. Common illiac aa. |
| Draw a simple diagram showing the “bell” stage of tooth development. Now, label only the embryonic layers that have adult crown derivatives. Lastly, include in parenthesis the adult derivative. | SEE NOTES |
| Print the word “true” or “false” in front of each statement: 1. __ The oronasal membrane lies just behind the secondary palate 2. __ Endoderm forms the epithelium of the paranasal sinuses | 1. False- Primary palate 2. False- Ectoderm |
| 3. __ Surfactant is produced at seven months of fetal development 4. __ The primitive choanae are located behind the primary palate | 3. True 4. True |
| What lymphatic sacs may be responsible for: a) deep cervical nodes b) lumbar nodes | a) Jugular Sacs b) Retroperitoneal Sacs (*Could not find answers in notes) |
Created by:
ejjohnson
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