SDL1: Muscles of the Back

Question 1

Name the superficial extrinsic back muscles.

Answer 1

Rhomboid major
Rhomboid minor
Levator scapula
Trapezius
Latissimus dorsi

Question 2

Name the intermediate extrinsic back muscles.

Answer 2

Serratus posterior superior

Serratus posterior inferior

Question 3

Describe the innervation of the extrinsic back muscles.

Answer 3

Dorsal rami of spinal nerve and the accessory nerve (trapezius).

Question 4

Name the superficial deep back muscles.

Answer 4

Splenius capitus

Splenius cervicis

Question 5

Describe the attachments of splenius capitus.

Answer 5

Origin: Lower half of ligamentum nuchae, spinous processes of CVII to TIV

Insertion: Mastoid process, skull below lateral one third of superior nuchal line

Question 6

What is the function of splenius capitus

Answer 6

Together—draw head backward, extending neck; individually—draw and rotate head to one side (turn face to same side).

Question 7

Describe the innervation of splenius capitus.

Answer 7

Posterior rami of middle cervical nerves.

Question 8

Describe the attachments of splenius cervicis.

Answer 8

Origin: Spinous processes of TIII to TVI

Insertion: Transverse processes of CI to CIII

Question 9

Describe the function of splenius cervicis.

Answer 9

Together—extend neck; individually—draw and rotate head to one side (turn face to same side).

Question 10

Describe the innervation of splenius cervicis.

Answer 10

Posterior rami of lower cervical nerves.

Question 11

Name the intermediate group of deep back muscles.

Answer 11

Spinalis
Longissimus
Iliocostalis

Question 12

Name the deep group of the deep back muscles.

Answer 12

Semispinalis
Multifidis
Rotares