Development of the Muscular and Skeletal Systems

Question 1

all muscles come from myotome EXCEPT

Answer 1

iris muscles (constrictor/dilator pupile)

Question 2

sternum develops from the

Answer 2

somatic lateral plate mesoderm

Question 3

caudalization

Answer 3

gain of function

Question 4

cranialization

Answer 4

loss of function

Question 5

epaxial muscles

Answer 5

muscles of the back

Question 6

hypaxial muscles

Answer 6

muscles of the limbs, abdomen, chest, neck

Question 7

poland syndrome

Answer 7

absence of pec major and minor
syndactyly
ipsilateral breast hypoplasia
absence of 2 to 4 ribs
underlying problem? hypaxial part of myotome did not migrate appropriately

Question 8

prune-belly sydrome

Answer 8

partial or complete absence of abdominal muscles

hypaxial muscles fail to migrate to lateral plate