Neck Muscles

Question 1

LEVATOR SCAPULAE

Answer 1

O: TVP's of C1-C4
I: medial border of scapula from root of spine to superior angle
N: dorsal scapular nerve
K:
1) Ipsilateral flexion of neck
2) Extension of neck
3) Elevation of the scapula
4) Downward rotation of the scapula
5) Ipsilateral rotation of the neck

Question 2

SPLENIUS CAPITIS

Answer 2

O: nuchal ligament from C3-C6 & SP’s of C7-T4
I: lateral 1/3 of superior nuchal line of occiput & mastoid process
N: dorsal rami of spinal nerves
K:
1) Extension of the head & neck @ spinal joints
2) Lateral flexion “ “
3) Ipsilateral rotation “ “

Question 3

SPLENIUS CERVICIS

Answer 3

O: SP's of T3-T6
I: TVP's of C1-C3
N: dorsal rami of spinal nerves
K:
1) Extension of the neck @ spinal joints
2) Lateral flexion " "
3) Ipsilateral rotation " "

Question 4

STERNOCLEIDOMASTOID

Answer 4

O: manubrium of the sternum & medial 1/3 of the clavicle
I: mastoid process & lateral 1/3 of superior nuchal line
N: spinal accessory nerve
K:
1) Flexion of the lower neck @ spinal joints
2) Extension of upper neck and head “ “
3) Lateral flexion of head and neck “ “
4) Contralateral rotation of neck and head “ “
5) Elevation of sternum and clavicle during forced inhalation

Question 5

SCALENES

Answer 5

for O’s & I’s:
Anterior: anterior tubercles on TP’s of C3-C6 –> rib 1 (scalene tubercle)
Middle: posterior tubercles on TP’s of C2-C7 –> rib 1 (superior surface)
Posterior: posterior tubercles on TP’s of C5-C7 –> rib 2 (external surface)

N:
Anterior: ventral rami of cervical nerves c4-c6
Middle: ventral rami of cervical nerves C3-C8
Posterior: ventral rami of cervical nerves C6-C8

K

Anterior & middle flex the neck @ spinal joints and elevate rib 1

Posterior elevates rib 2

All 3 do lateral flexion of the neck at spinal joints