Kinesiology - Unit 3 Muscles

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