Question 1

Which embryonic structure is primarily responsible for forming the abdominal wall and peritoneal cavity during lateral folding?

Accepted Answer

Somatic lateral plate mesoderm

Question 2

During embryonic folding, which process results in the incorporation of part of the umbilical vesicle into the embryo to form the foregut?

Accepted Answer

Head fold

Question 3

The intraembryonic coelom eventually partitions to form which of the following body cavities?

Accepted Answer

Pericardial, pleural, and peritoneal cavities

Question 4

Which of the following best describes the fate of the sclerotome during vertebral development?

Accepted Answer

Migrates around the neural tube and notochord to form vertebrae and ribs

Question 5

Which equation best represents the rate of somite formation during embryogenesis?

Accepted Answer

$$N = 1 + 3(t - 21)$$, where $$N is $$the number of somite pairs and $$t is $$the day after fertilization$

Question 6

A mutation disrupts the migration of neural crest cells during cranial development. Which structure is most likely to be affected?

Accepted Answer

Facial bones (viscerocranium)

Question 7

Which of the following statements about the differentiation of the somite is correct?

Accepted Answer

The myotome forms most of the skeletal muscles

Question 8

During musculoskeletal development, which embryonic tissue gives rise to the majority of limb bones?

Accepted Answer

Lateral plate mesoderm

Question 9

Which of the following is TRUE regarding the innervation of epaxial and hypaxial muscles?

Accepted Answer

Epaxial muscles are innervated by dorsal rami; hypaxial by ventral rami

Question 10

Which real-life clinical anomaly results from the failure of vertebral arches to fuse dorsally during development?

Accepted Answer

Spina bifida

Question 11

Which embryonic event is responsible for the formation of the cloaca?

Accepted Answer

Tail fold incorporating the hindgut and allantois

Question 12

Which type of ossification is responsible for the formation of most flat bones of the skull?

Accepted Answer

Intramembranous ossification

Question 13

A patient presents with a patch of skin on the lateral thigh that has lost sensation. Which embryological concept explains the segmental innervation of this skin region?

Accepted Answer

Dermatome

Question 14

Which of the following best describes the role of the apical ectodermal ridge (AER) in limb development?

Accepted Answer

Induces adjacent mesenchyme to proliferate and form limb structures

Question 15

Which of the following is a correct sequence of events in limb bone development?

Accepted Answer

Mesenchymal condensation → chondrification → endochondral ossification

Question 16

Which of the following best explains why vertebral bodies are intersegmental in origin?

Accepted Answer

They are formed from the fusion of cranial and caudal portions of adjacent sclerotomes

Question 17

Which embryonic tissue forms the serous membrane lining the pericardial, pleural, and peritoneal cavities?

Accepted Answer

Mesothelium derived from mesenchyme

Question 18

Which of the following is TRUE regarding the development of the sternum?

Accepted Answer

It develops from mesenchymal condensation of the lateral plate mesoderm ventral to the developing ribs

Question 19

Which process allows the skull to change shape during birth and grow with the brain?

Accepted Answer

Formation of fontanelles and sutures

Question 20

Which of the following is a consequence of premature closure of cranial sutures?

Accepted Answer

Craniosynostosis

Embryonic Folding and Musculoskeletal System Development: Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards