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Neck Muscles
Antero-lateral neck:
Sternocleidomastoid
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Created by
Hiri P
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Cards (5)
O (origin):
Sternal head:
upper
surface
manubrium
Clavicular head:
upper
surface
medial
1
/3
clavicle
A)
sternocleidomastoid
1
R (direction):
Upwards
A)
sternocleidomastoid
1
I (insertions):
Mastoid process
of
skull
A)
sternocleidomastoid
1
A (actions):
Assists with
respiration
Bilateral action:
neck flexion
(posterior fibres may also
extend
head on neck at atlantooccipital joint)
Unilateral action:
ipsilateral
lateral flexion
and
contralateral rotation
A)
sternocleidomastoid
1
NS (nerve supply):
Motor:
Spinal
part of
accessory
nerve (
cranial
nerve
11
)
Sensory:
Ventral
rami
C2
,
C3
A)
sternocleidomastoid
1