Lab Practical 1 Muscle Actions

Question 1

Splenius Capitis

Answer 1

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

Question 2

Splenius Cervicis

Answer 2

Laterally flex & 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 & ribs (L spine inadvertently); bilaterally act in extension of T & L spine, hold T & 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 & laterally flex head; bilaterally extend head

Question 9

Spinalis Thoracis

Answer 9

extend T spine

Question 10

Spinalis Cervicis

Answer 10

lateral flexion & rotation of C spine; bilaterally extend neck

Question 11

Spinalis Capitis

Answer 11

lateral flexion & rotation of head; bilaterally extend head

Question 12

Semispinalis Thoracis

Answer 12

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

Question 13

Semispinalis Cervicis

Answer 13

Extension, rotation, & 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 the L spine; bilaterally extends the L spine; stabilizes & depresses the 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 & back; forced inspiration

Question 22

Longus Colli

Answer 22

flexion & extension of neck; rotation to the contralateral side

Question 23

Longus Capitis

Answer 23

flex the head

Question 24

Rectus Capitis Anterior

Answer 24

flex the head

Question 25

Rectus Capitis Lateralis

Answer 25

laterally flex the head to ipsilateral side