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Sternocleidomastoid O
Sternum and clavicle
Sternocleidomastoid I
Mastoid process
Sternocleidomastoid A
Bilateral: Head and neck flexion
Unilateral: lateral neck flexion to same side & rotation of head to opposite side + accessory muscle of ventilation
Sternocleidomastoid N
Accessory nerve (cranial XI); 2nd and 3rd cervical nerves
Sternocleidomastoid summary
O on sternum and clavicle
I on mastoid process
A bilateral: head & neck flexion, unilateral: lateral neck flexion to same side + rotation of head to opposite side, accessory muscle of ventilation
N: accessory nerve (cranial XI); 2nd and 34: cervical nerves
Scalenes O
Transverse process of the cervical vertebrae
Scalenes I
First and second ribs
Scalenes A
Bilateral: Neck flexion
Unilateral: lateral neck flexion to same side
accessory muscle of ventilation
Scalenes N
Third through eighth cervical nerves
Scalenes summary
O: transverse process of the cervical vertebrae
I: first and second ribs
A: bilateral: neck flexion, unilateral: lateral neck flexion to same side, accessory muscle of ventilation
N: 3rd-8th cervical nerves
Splenius capitis O
Lower half of nuchal ligament; spinous processes of C7-T3
Splenius capitis I
Lateral occipital bone, mastoid process
Splenius capitis A
Bilateral: head and neck extension, Unilateral: lateral flexion & rotation of head to same side
Splenius capitis N
Middle and lower cervical nerves
Splenius capitis summary
O: lower half of nuchal ligament; spinous processes of C7-T3
I: lateral occipital bone, mastoid process
A: bilateral: head and neck extension, unilateral; lateral flexion & rotation of head to same side
N: Middle and lower cervical nerves
Prevertebral muscles (name them)
A - rectus capitis lateralis
B - rectus capitis anterior
C - longus capitis
D - longus colli
Prevertebral muscles o
Collectively from bodies and transverse processes of C2 to T2
Prevertebral muscles A
Flex head and neck (as in tuck the chin); assists in lateral flexion of head on neck
Prevertebral muscles N
Branches of C1-C7
Prevertebral muscles summary
O - collectively from bodies and transverse processes of C2-T2
I - collectively to occipital and transverse processes and bodies of C1-C6
A - Flex head and neck (as in tucking the chin), assists in lateral flexion of head on neck
N - branches of C1-C7