Axial Anatomy Muscles 1

Front 1

Nasalis (facial expression)

Back 1

Origin: Maxilla
Insertion: Bridge of Nose
Innervation: Facial
Action: Dilates Nostrils

Front 2

Occipitofrontalis (facial expression)

Back 2

Origin: Occipital bone
Insertion: skin of eye brows & nose
Innervation: facial
Action: moves scalp & elevates eyebrows

Front 3

Orbicularis Oculi (facial expression)

Back 3

Origin: Maxilla & Facial Bones
Insertion: circles of orbit & inserts near origin
Innervation: Facial
Action: closes eyes

Front 4

Orbicularis Oris (facial expression)

Back 4

Origin: nasal septum, maxilla & mandible
Insertion: Fascia & muscles of the lips
Innervation: Facial
Action: Closes Lips

Front 5

Temporalis (mastication)

Back 5

Origin: Temporal Bone
Insertion: anterior portion of ramus & coronoid of mandible
Innervation: trigeminal
Action: elevates, retracts mandible & some excursion

Front 6

Masseter (mastication)

Back 6

Origin: zygomatic arch
Insertion: lateral aspect of mandibular ramus
Innervation: trigeminal
Action: elevates, protracts mandible & some excursion

Front 7

Semispinals capitis (moving head & neck)

Back 7

Origin: cervical & thoracic vertebrae
Insertion: occipital bone
Innervation: C1
Action: extends & rotates head

Front 8

Splenius capitis (moving head & neck)

Back 8

Origin: cervical & thoracic vertebrae
Insertion: occipital bone & mastoid process
Innervation: cervical nerves
Action: extends, rotates & laterally flexes neck

Front 9

Trapezius (moving head & neck)

Back 9

Origin: occipital bone, cervical & thoracic vertebrae
Insertion: clavicle & scapula
Innervation: accessory
Action: extends & laterally flexes neck

Front 10

Sternocleidomastoid (moving head & neck)

Back 10

Origin: manubruim & clavicle
Insertion: mastoid process & superior nuchal line
Innervation: accessory
Action: 1 contracted alone: laterally flexes head & neck to same side & rotates head & neck. Both: flexes neck

*assists in deep breathing to lift diaphragm