G3 Back Muscles

Question 1

What muscles come from epaxial mesoderm and what rami innervates them? And what about Hpaxial mesoderm?

Answer 1

Epaxial: intrinsic back muscles, posterior rami

Hypaxial: Limb and trunck muscles, anterior rami

Question 2

What are the three divisions of the semispinalis group?

Answer 2

Thoracis, cervicis, and capitis
The cervicis are deep to the capitis and only go up to C2
Capitis is deep to splenius

Question 3

What kind of rotation is produced by unilateral contraction of transversospinal group muscles?

Answer 3

Contralateral rotation

Question 4

What are levator costarum muscles?

Answer 4

Respiratory muscles. They go from transverse processes inferiorly to ribs. Longus skips a rib.

Question 5

What are the segmented muscles between the spinous processes and the transverse processes?

Answer 5

Intertransversarii

Interspinalis

Question 6

What are the functions of the suboccipital and greater occipital nerves?

Answer 6

Suboccipital only does motor function

Greater occipital only does sensory