Download Anatomy Practice Lecture 2: This layer of intraembryonic mesoderm

Anatomy Practice
Lecture 2:
1. This layer of intraembryonic mesoderm organizes into somitomeres craniocaudally:
a. Lateral mesoderm
b. Neural groove
c. Intermediate mesoderm
d. Paraxial mesoderm
2. Regarding somites, which of the following is a false statement?
a. Somites differentiate into 3 primary components
b. Counting somites is one criteria used to determine embryonic age
c. While somitomeres will initially condense to form 42-44 pairs of somites, a final count of
about 35 is likely
d. Hypaxial mm are formed by the myotome component of the somites and innervated
by the dorsal primary rami
3. Intraembryonic coelem:
a. divides the somatopleure and the splanchnopleure in the intermediate mesoderm
b. comprises the spacing between somite pairs of paraxial mesoderm
c. is a dividing space associated bordered by a dorsal mesodermal layer that contributes
to the ventral body wall and limb buds
d. is a term for somitomeres 1-7
4. Which is not one of the tissue sources from which the diaphragm is formed?
a. Dorsal mesentery of esophagus
b. Pleuropericardial membranes
c. Pleuroperitoneal membranes
d. Body wall
e. Septum transversum
5. Of the diaphragmatic tissue sources, which ultimately forms the right and left
costodiaphragmatic recesses and establishes the dome-shaped configuration of the diaphragm?
a. Dorsal mesentery of esophagus
b. Pleuropericardial membranes
c. Pleuroperitoneal membranes
d. Body wall
e. Septum transversum
6. A 9 yo male presents to your rotation site’s ER with a suspected lung obstruction from a foreign
body. Based on your embryo knowledge, you know the obstruction is more likely to have
occurred in the right lung because:
a. There are 3 right and 2 left secondary bronchi
b. There are 3 left and 2 right secondary bronchi
c. The right primary bronchus is larger and more vertical than the left primary bronchi
d. The left primary bronchi is larger and more vertical than the right primary bronchi
7. Regarding pleural development:
a. Splanchnic mesoderm becomes visceral pleura
b. Somatic endoderm becomes parietal pleura
c. The space between the parietal pleura and the body wall is the pleural cavity
d. The pericardioperitoneal canals do not develop into the pleural cavities.
8. Which of the following is the correct lung development sequence:
a. Canalicular, glandular, alveolar, terminal sac
b. Glandular, canalicular, terminal sac, alveolar
c. Alveolar, glandular, canalicular, terminal sac
d. Glandular, terminal sac, canalicular, alveolar
9. This stage of lung development is significant because primitive alveoli develop along with
respiratory bronchioles and terminal sacs:
a. Terminal sac
b. Glandular
c. Alveolar
d. Canalicular
10. This lung development stage is clinically important because T1 and T2 cells develop and a blood
air barrier is established making respiration possible and premature birth survivable in the NICU:
a. Terminal sac
b. Glandular
c. Alveolar
d. Canalicular
11. A 33 yo woman gives birth to an infant in distress. She had come on hard times and was unable
to get proper prenatal healthcare in the months leading up to term. The infant was cyanotic
with severe dyspnea and an unusually flat abdomen. Upon auscultation, you hear what sounds
like peristalsis while trying to record heart sounds. What is the most likely root cause of this
infants’ disorder?
a. An abnormally large esophageal hiatus and incompetent esophogastric sphincter
b. Failure of bronchial buds to develop
c. Failure of the pleuroperitoneal membrane to fuse with the other diaphragmatic
components
d. Failure of the phrenic n. to supply diaphragmatic motor innervation