origin

insertion

action

Medial aspect of bony orbit

Skin around eyelids

Closes eyelid; acts during squinting and blinking

Maxillary bone; mandible

Lips

Closes and protrudes lips as in speaking, kissing, and whistling

Zygomatic arch

Lateral surface of mandibular ramus

Elevates mandible to close jaw; protrudes mandible

Temporal bone

Coronoid process of mandible

Elevates mandible to close jaw; retrudes mandible

insertion?

Mastoid process; occipital bone near mastoid process

Flexion and lateral flexion of neck; rotates head so that face is turned superiorly and to the opposite side

Transverse processes of superior four cervical vertebrae

Medial border of scapula near superior angle

Elevates scapula; inferior rotation of scapula

Inferior border of superior rib

Superior border of inferior rib

Elevates the ribs during normal inspiration

Superior border of inferior rib

Inferior border of superior rib

Depresses the ribs during forced expiration

External surfaces of inferior eight ribs

Linea alba; pubic crest; pubic tubercle; iliac crest

Rotation and lateral flexion of trunk; increases intraabdominal pressure during forced expiration

Thoracolumbar fascia; iliac crest; inguinal ligament

Linea alba; pubic crest; inferior three or four ribs

Rotation and lateral flexion of trunk; increases intraabdominal pressure during forced expiration

Medial half of clavicle; sternum; costal cartilages of ribs 1-6

Lateral lip of intertubercular groove on humerus

Flexion, medial rotation, and adduction of the arm

External surfaces of ribs 3-5

Coracoid process of scapula

Depression and inferior rotation of scapula

External surfaces of ribs 1-8

Medial border of scapula

Protraction and superior rotation of scapula; holds scapula against thoracic wall

Spinous processes of vertebrae T6-T12; thoracolumbar fascia; iliac crest; inferior three ribs

Intertubercular groove of humerus

Extension, adduction, and medial rotation of arm

Posterior surface of occipital bone; ligamentum nuchae; spinous processes of thoracic vertebrae

Lateral third of clavicle; acromion process; spine of scapula

scapula    Middle fibers: retract scapula Inferior fibers: depress scapula

Lateral third of clavicle; acromion process; spine of scapula

Deltoid tuberosity of humerus

and flexion of arm Middle fibers: abduction of arm Posterior fibers: lateral rotation and extension of arm

ligamentum nuchae; spinous processes of vertebrae C7 and T1

Medial border of scapula

Elevates scapula; acts with pectoralis minor to inferiorly rotate scapula; also retracts scapula

Scapula, near inferior angle

Medial lip of intertubercular groove

Extension, adduction, and medial rotation of arm

Supraspinous fossa of scapula

Greater tubercle of humerus

Abduction of arm

Infraspinous fossa of scapula

Greater tubercle of humerus

Lateral rotation of arm

Lateral border of scapula

Greater tubercle of humerus

Lateral rotation of arm

Subscapular fossa of scapula

Greater tubercle of humerus

Adduction and medial rotation of arm

Long head : superior margin of glenoid fossa of scapula Short head : coracoid process of scapula

Radial tuberosity of radius; fascia of medial forearm via bicipital aponeurosis

Flexion and supination of forearm; flexion of arm

Anterior surface of humerus

Coronoid process of ulna

Flexion of forearm

Coracoid process of scapula

Medial surface of humerus

Flexion and adduction of arm

Long Head :    inferior margin of glenoid fossa of scapula Lateral Head :    posterior surface of humerus
Medial Head :    posterior surface of humerus, inferior to origin of lateral head

Olecranon process of ulna

Extension of forearm; long head extends and adducts arm

Medial epicondyle of humerus; coronoid process of ulna

Lateral surface of radius

Pronation and flexion of the forearm

Lateral supracondylar ridge of humerus

Lateral surface of distal radius

Flexion of forearm

Lateral epicondyle of humerus; proximal ulna

Posterior, lateral, and anterior surfaces of proximal radius

Supination of the forearm