Lab: Muscle Actions

Question 1

Splenius Capitis

Answer 1

Laterally flex head and rotate face to side; bilaterally extend head

Question 2

Splenius Cervicis

Answer 2

Laterally flex and rotate neck; bilaterally extend neck

Question 3

Iliocostalis Lumborum

Answer 3

Extension, lateral flexion, rotation of L spine; lateral movement of pelvis

Question 4

Iliocostalis Thoracis

Answer 4

Extension, lateral flexion T spine

Question 5

Iliocostalis Cervicis

Answer 5

Extension, lateral flexion, rotation lower C spine

Question 6

Longissimus Thoracis

Answer 6

Lateral flexion T spine and ribs (L spine inadvertently); bilaterally act in extension of T and L spine, hold T and L spine erect (increases L lordosis); lateral movement of pelvis

Question 7

Longissimus Cervicis

Answer 7

Lateral flexion of neck; bilaterally extend neck

Question 8

Longissimus Capitis

Answer 8

Rotate and laterally flex head; bilaterally extend head

Question 9

Spinalis Thoracis

Answer 9

Extend T spine

Question 10

Spinalis Cervicis

Answer 10

Lateral flexion and rotation of head; bilaterally extend head

Question 11

Spinalis Capitis

Answer 11

Lateral flexion and rotation of head; bilaterally extend head

Question 12

Semispinalis Thoracis

Answer 12

Extension, rotation, and lateral flexion of upper T and lower C spine; bilaterally extend T spine

Question 13

Semispinalis Cervicis

Answer 13

Extension, rotation, and lateral flexion of C spine; bilaterally extend neck

Question 14

Semispinalis Capitis

Answer 14

Turns face to side; bilaterally extends head (neck inadvertently)

Question 15

Rectus Capitis Posterior Major

Answer 15

Turns face to side; bilaterally extends head

Question 16

Rectus Capitis Posterior Minor

Answer 16

Extends head

Question 17

Obliquus Capitis Superior

Answer 17

Lateral flexion of head; bilaterally extends head

Question 18

Obliquus Capitis Inferior

Answer 18

Turns face to side

Question 19

Quadratus Lumborum

Answer 19

Steadies origin of diaphragm; when pelvis is fixed, it will laterally flex L spine; bilaterally extends L spine; stabilizes and depresses 12th rib

Question 20

Serratus Posterior Superior

Answer 20

Elevate upper 5 ribs in inspiration

Question 21

Serratus Posterior Inferior

Answer 21

Draws lower 4 ribs down and back; forced inspiration

Question 22

Longus Colli

Answer 22

Flexion and extension of neck; rotation to contralateral side

Question 23

Longus Capitis, Rectus Capitis Anterior

Answer 23

Flex head

Question 24

Rectus Capitis Lateralis

Answer 24

Laterally flex head to ipsilateral side