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Embryo Mash 3 NWHSU
| Question | Answer |
|---|---|
| In detail, why does the stomach rotate clockwise around its vertical axis? | -Dorsal mesentary grows -rotation occurs because right mesentary breaks down |
| Specifically from what does the infracardiac bursa develop? Specifically where is it located? | from superior recesses of the omental bursa forming cycstic structure posterior and lung not above the diaphragm |
| Draw a simple diagram showing the bell stage of tooth development. Lable embryonic layers which have adult crown derivatives. include the adult derivatives | Inner dental epithelium of crown (enamel), outer mesenchymal cells of dental papill (dentin), inner messenchymal cells of dental papilla (pulp) |
| 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 |
| True or false Tracheoesophageal fistulas usually connect to trachea at the tracheas upper end | false |
| True or false at birth the tracheal bifurcation is at T6 | False |
| True or false The oronasal membrane lies just behind the secondary palate | false |
| True or false Endoderm forms the epithelium of the paranasal sinuses | False |
| What specific embryonic vessels (give right or left if necessary) give rise to: Oblique vein of Marshall | Left common cardinal |
| What specific embryonic vessels (give right or left if necessary) give rise to: gonadal veins | subcardinals |
| Discuss in detail the development of the ductus venosus. | The liver grows L to R over the umbillical and vitelline vein. The lumbilicus v and R vitelline Vein are connected to help blood flow of the heart and later become ductus venosus. |
| Concerning development of the portal vein: What embryonic veins are responsible for its formation? | The vitellines are responsible for formation |
| Concerning development of the portal vein: What specific part of the vein remains to form the portal? | R UG of cervical ring and the middle anatamosis remain |
| What specific embryonic vessels (give r or l if necessary) give rise to: Internal jugular vein | Cranial parts of precardinals |
| What specific embryonic vessels (give r or l if necessary) give rise to: Distal left renal vein | L sub-supracardinal anatamosis |
| Discuss the development of the inferior vena cava. Include segments and embryonic vessels responsible. Use r or l if necessary. Both segment and embryonic vessels must be correct. | Hepatic-Common Hepatics Pre Renal-R subcaridinal Renal-R sub-supracardinal anastamosis Post renal-R supracardinal |
| Name Adult arteries which develop from the vitellines | -celiac A -Superior mesenteric A -Inferior mesenteric A |
| Besides the umbilicals, name 2 different arteries that develop from the embryonic unbilical arteries. | -Internal Iliac -Superior and middle vesical |
| Specifically how and where does the omental bursa begin its development | -as clefts/cavities/spaces -on the doral mesogastrium |
| True or False Only about 1/6 of the adult alveoli are present at birth | True |
| True or false The laryngotracheal groove develops from the pharynx during the 4th week of development | True |
| True or false Endoderm gives rise to the epithelium, but not connective tissue of the larynx, bronchi, and lungs. | True |
| In tracheoesophageal fistula, there is usually an additional fibrous cord attached to the larynx. | False |
| The trachea develops from which Endoderm, ectoderm, mesoderm or mixture? | Endoderm and Mesoderm |
| True or false At birth the tracheal bifurcation lies at T4 | True |
| true or false Ectopic lung lobes arise from the trachea or esophagus | true |
| Using the terms regresses and persists, give the fate of the right and left proximal and distal segments (distal to that part toward the placenta) of the umbilical veins: (Left umbilical Prox ______ Dist ______) (Right umbilical Prox ____ Dist _____) | (Left Umbilical Proximal regresses, Distal Persists) (Right umbilical proximal regresses, Distal regresses) |
| Briefly discuss the formation of the left brachiocephalic vein. | anastomosis between precardinals |
| What specific embryonic vessels (l and r if necessary) give rise to: Hepatic sinusoids | Vitellines R and L |
| hat specific embryonic vessels (l and r if necessary) give rise to:hat specific embryonic vessels (l and r if necessary) give rise to: Suprarenal veins | Subcardinals R and L |
| What lymphatic sacs may be responsible for: Deep cervical nodes- Lumbar nodes- | deep cervical-jugular sacs lumbar nodes-retroperitoneal |
| What embryonic component of the bell stage of tooth development gives rise to: the cells that form the pulp | inner mesenchymal cells of dental papilla |
| t embryonic component of the bell stage of tooth development gives rise to: Dentin (odontoblasts) | outer mesenchymal cells of dental papilla |
| Mesenchyme imediately peripheral to the dentin of the root of a developing tooth forms what two components | cementum and peridontal membrane |
| What specific embryonic vessels (give l and r if necessary) gives rise to: Right renal vein | intersubcardinal anastomosis |
| What specific embryonic vessels (give l and r if necessary) gives rise to: Proximal left renal vein | intersubcardinal anastomosis |
| Name the adult components formed from the primary head vein. | Dural venous sinus Cerebral veins |
| Give the name of the embryonic component that specifically forms: Enamel Dental Cuticle | Enamal-inner dental epithelium Dental cuticle-stellate reticulum |
| In detail discuss how the pancreas becomes retroperitoneal. | Mesoduodenum on the right and mesogastrium on the left fuse together at the dorsal body wall |
| During development of the arteries within the limb bud, a main ventral ______ vessel develops by enlargement and consolidation of the capillary plexus vessels. | axial vessels |
| Discuss the development of the vertebral artery. | The dorsal ramus of the dorsal intersegment fuse via anastomosis between 1-7 forming the vertebral artery |
| What specific embryonic vessels form: hepatic veins | R vitelline |
| What specific embryonic vessels form: Superior vena cava | R common cardinal and R precardinal |
| What specific embryonic vessels form: hemiazygos, accessory hemiazyogos | supracardinal Vein |
| What components comprise the ventral mesentery? | falciform ligament, lesser omentum |
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T1NWHSU
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