Temporalis:

Origin: along temporal lines of skull

Insertion: Coronoid process of

mandible

Action: Elevates mandible

Masseter:

Origin: Zygomatic arch

Insertion: Lateral surface of

mandibular ramus

Action: Elevates mandible and closes

the jaw

Sternocleidomastoid:

Origin: Sternal end of clavicle,

manubrium

Insertion: Mastoid region of skull

Action: Flexes the neck

Pectoralis Major:

Origin: Cartilage of ribs 2-6, ribs of

sternum, and inferior medial portion

of clavicle

Insertion: Greater tubercle of the

humerus

Action: Flexion, adduction, medial

rotation of the shoulder

Pectoralis Minor:

Origin: Anterior surface of ribs2-4

and 5 or 3-5

Insertion: Coracoid process of the

scapula

Action: Depresses and protects

shoulder

Bicep Brachii:

Origin: Scapula

Insertion: Tuberosity of radius

Action: Flexion at elbow and

shoulder, supination

Brachioradialis:

Origin: Lateral/distal humerus

Insertion: Distal/lateral radius

Action: Flexes forearm

Flexor Carpi Radialis:

Origin: Medial epicondyle of

humerus

Insertion: Base of 2nd-3rd metacarpal

bones

Action: Flexion and abduction of the

wrist

Flexor Carpi Ulnaris:

Origin: Medial epicondyle of the

humerus

Insertion: Pisiform, hamate, and 5th

metacarpal bone

Action: Flexion and adduction of the

wrist

Rectus Abdominus:

Origin: Superior surface of pubis

around symphysis

Insertion: Inferior surfaces of costal

cartilage (Ribs 5-7) and xiphoid

process

Action: Depresses ribs, compresses

abdomen, flexes vertebral column

Iliacus:

Origin: Iliac fossa of the ilium

Insertion: Femur distal to lesser

trochanter

Action: flexion at hip

Psoas Major:

Origin: Anterior surfaces and

transverse process of vertebrae (T12-

L5)

Insertion: Lesser trochanter with

iliacus

Action: Flexion at hip

Origin/Insertion/Action

Human Anatomy and Physiology II (BIO-202)

Grand Canyon University

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