Prevertebral muscles

Question 1

Longus colli
(Ant)

Answer 1

-Innervation: anterior rami of C2-C6
-Actions: Flexion of neck (lateral, anterior)

Question 2

Longus capitis
(Ant)

Answer 2

-Innervation: anterior rami of C1-C3
-Actions: Flexion of head on neck

Question 3

Rectus capitis anterior
(Ant)

Answer 3

-Innervation: Branches loop between C1 and C2
-Actions: Flexion of head on neck

Question 4

Anterior scalene
(Ant)

Answer 4

-Innervation: C4-C6
-Actions: Forced inspiration, elevates 1st rib

Question 5

Rectus capitis lateralis
(lateral)

Answer 5

-Innervation: Branches loop between C1 and C2
-Actions: Flexes head and helps stabilize it

Question 6

Splenius capitis
(lateral)

Answer 6

-Innervation: Posterior rami of middle cervical spinal nerves
-Actions: lateral flexion and rotation of head and neck to same side, extends head and neck

Question 7

Levator scapulae
(lateral)

Answer 7

-Innervation: Dorsal scapular nerve C5, Cervical spinal nerves C3 and C4
-Actions: Elevates scapula and tilts glenoid cavity inferiorly by rotating scapula

Question 8

Middle scalene
(lateral)

Answer 8

-Innervation: Anterior rami of cervical spinal nerves
-Actions: Flexes neck laterally; forced inspiration, elevates 1st rib

Question 9

Posterior scalene
(lateral)

Answer 9

-Innervation: Anterior rami of cervical spinal nerves C7 and C8
-Action: Flexes neck laterally; elevates 2nd rib during forced inspiration