The Arm

Free Web Hosting Provider - Web Hosting - E-commerce - High Speed Internet - Free Web Page

The Arm

Trapezius:

Origin- occipital between cervical and thoracic vertebrae
Insertion- clavicle spine and scapula
Function- moves sholder blades

Pectoralis major:

Origin- clavicle, sternum, upper ribs
Insertion- humerus
Function- push up muscle

Latissimus dorsi:

Origin- sacral vertebrae and iliac crest
Insertion- humerus
Function- pulls the sholder back and down

Deltoid:

Origin- scapula and clavicle
Insertion- humerus
Function- abduct the upper arm

Biceps brachii:

Origin- scapula
Insertion- radius
Function- synergist; flex the arm at the elbow, rotate the hand

Brachioradialis:

Origin- distal lateral humerus
Insertion- radius above the styloid process
Function- primary mover;flexes the arm at the elbow

Brachialis:

Origin- humerus
Insertion- ulna
Function- synergist; flexes the arm at the elbow

Triceps brachii:

Origin- laterial, medial humerus
Insertion- ulna
Function- antagonist; extends the arm at the elbow

Flexor carpi radialis/ulnaris:

Origin- humerus and olecranal
Insertion- carpal and metacarpal
Function- flexes, adducts/abducts the wrist

Flexor digitorum:

Origin- humerus, ulna, radius
Insertion- bases of distal phalanges tendons (fingers)
Function- flexes fingers

Extensor carpi radialis/ulnaris:

Origin- humerus
Insertion- metacarpals
Function- extends and abducts the wrist

Extensor digitorum:

Origin- humerus
Insertion- phalanges
Function- extends fingers