Quiz 3 Practice Questions

Question 1

Someone with piebaldism might have been a mosaic or chimera who had a recessive gene for __________ migration.

Answer 1

Neural crest cell

Question 2

The periderm:

a. Creates basal layer
b. Forms intermediate layer
c. Forms root sheath
d. Sloughs off before birth

Answer 2

d. Sloughs off before birth

Question 3

Tendons and aponeuroses largely form from:

a. Lateral plate mesoderm
b. Intermediate mesoderm
c. Adjacent mesoderm
d. Paraxial mesoderm

Answer 3

d. Paraxial mesoderm

Question 4

When babies are first born, they are very good at remaining in the fetal position and keeping their hands clenched. This means which division is strongest at birth?

a. Epaxial
b. Hypaxial
c. Preaxial
d. Postaxial

Answer 4

b. Hypaxial

Question 5

In what order from earliest to latest do the fontanels close?

a. posterior and anterolateral, posterolateral, anterior
b. posterolateral, anterior, frontal, posterior
c. anterior, posterolateral, posterior and anterolateral
d. frontal, anterolateral, posterior, posterolateral

Answer 5

a. posterior and anterolateral, posterolateral, anterior

Question 6

Which of the following statements about cranial vault malformations is TRUE?

a. Trigonocephaly results from premature closure of the sagittal suture.
b. Brachycephaly results in a wedge-shaped cranium
c. Plagiocephaly results from unilateral closure of a coronal suture.
d. Microcephaly results in a twisted cranium.

Answer 6

c. Plagiocephaly results from unilateral closure of a coronal suture.

Question 7

Rim 4 is a gene that when mutated causes duplication of part or all of the ZPA. Which of the following would be the most likely phenotype of such an embryo?

a. Polydactyly
b. Syndactyly
c. Meromelia
d. Amelia

Answer 7

a. Polydactyly

Question 8

Thalidomide is a potent teratogen that caused a very large percentage of affected children to present with which defect?

a. polydactyly
b. syndactyly
c. meromelia
d. clefting

Answer 8

c. meromelia

Question 9

Which of these is derived from neural crest?

a. pharyngeal arch muscle
b. pharyngeal arch cartilage
c. pharyngeal pouch
d. pharyngeal arch artery

Answer 9

b. pharyngeal arch cartilage

Question 10

The recurrent laryngeal nerve loops differently around the subclavian arteries on the left vs. the right side of the body. The development of which arch is the cause of that difference?

a. Arch 2
b. Arch 3
c. Arch 5
d. Arch 6

Answer 10

d. Arch 6