Specific Muscles and Features

Origin of orbicularis oculi

Frontal and maxillary bones

insertion of orbicularis oculi

tissue of eyelid

action of oricularis oculi

closes eyelid

innervation of orbicularis oculi

facial nerve (VII)

origin of sternocleidomastoid

manubrium of sternum, medial end of clavicle

insertion of sternocleidomastoid

mastoid process

action of sternocleidomastoid

flexes neck, rotates head

innervation of sternocleidomastoid

spinal accessory nerve (XI)

origin of masseter

zygomatic arch, zygomatic bone

insertion of masseter

angle and ramus of mandible

action of masseter

closes jaw

innervation of masseter

trigeminal nerve (V)

origin of temporalis

temporal fossa

insertion of temporalis

coronoid process of mandible

action of temporalis

closes jaw

innervation of temporalis

trigeminal nerve (V)

origin of deltoid

lateral 1/3rd of calvicle, acromion, and spine of scapula

insertion of deltoid

deltoid tuberosity

action of deltoid

abducts arm

innervation of deltoid

axillary nerve

origin of supraspinatus

supraspinous fossa

insertion of suprapsinatus

greater tubercle of the humerus

action of supraspinatus

abducts arm

innervation of supraspinatus

suprascapular nerve

origin of infraspinatus

infraspinous fossa

insertion of infraspinatus

greater tubercle of the humerus

action of the infraspinatus

externally rotates the arm

innervation of the infraspinatus

suprascapular nerve