Anatomy 231 upper limb/arm: Origin Insertion and Action

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Anatomy 231 upper limb/arm: Origin Insertion and Action
2014-11-16 16:33:06
Muscles upper limb arm

Origin, Insertion and Action of upper limb/arm
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  1. Triceps Brachii
    • Origin
    • - Long head: Infraglenoid tubercle of scapula
    • - Lateral head: Posterior shaft of humerus.
    • - Medial head: Posterior humeral shaft distal to radial groove.
    • Insertion= By common tendon into olecranon process of ulna.
    • Action= Forearm extensor. Prime mover, particularly medial head. antagonist of forearm flexors; Long & lateral head: extension against resistance; Long head tendon: arm adduction.
  2. Biceps Brachii
    • Origin=
    • - Short head: Coracoid process.
    • - Long head: Supraglenoid tubercle and lip of glenoid cavity.
    • Insertion= By common tendon into radial tuberosity.
    • Action= Flexes elbow joint and supinates forearm
  3. Brachialis (skip)
    • Origin= Front of distal humerus; embraces insertion of deltoid muscle.
    • Insertion= Coronoid process of ulna and capsule of elbow joint.
    • Action= forearm flexor.
  4. Flexor Carpi Radialis
    • origin= Medial epicoldyle of humerus
    • Insertion= Base of second and third metacarpals
    • Action= Flexor of wrist. Abducts hand. Weak synergist of elbow flexion.
  5. Flexor Carpi Ulnaris
    • Origin= Medial epicondyle of humerus; olecranon process and surface of ulna
    • Insertion= Pisiform and hamate bones and base of fifth metacarpal.
    • Action= Flexor of wrist; also adducts hand
  6. Flexor Digitorum superficialis
    • Origin= Medial epicondyle of humerus, coronoid process of ulna; shaft of radius.
    • Insertion= Bu four tendons into middle phalanges of fingers 2-5.
    • Action= Flexes wrist and middle phalanges 2-5.
  7. Flexor pollicis longus
    • Origin= Anterior surface of radius and interosseous membrane.
    • Insertion= Distal Phalanx of thumb. 
    • Action= Flexes distal phalanx of thumb.
  8. Extensor Carpi Radialis Longus
    • Origin= Lateral supracondylar ridge of humerus.
    • Insertion= Base of second metacarpal.
    • Action= Extend wrist with extensor carpi ulnaris and abducts wrist with flexor carpi raialis.
  9. Extensor Digitorium
    • Origin= Lateral epicondyle of humerus
    • Insertion= By four tendons into extensor expansions and distal phalanges of fingers 2-5.
    • Action= Finger extensor; extends wrist; abduct fingers
  10. Extensor carpi ulnaris
    • Origin= lateral epicondyle of humerus and posterior border of ulna.
    • Insertion= Base of fifth metacarpal.
    • Action= Extends wrist with extensor carpi radialis, adducts wrist with flexor carpi ulnaris.
  11. Extensor pollicis longus
    • Origin= Dorsal shaft of radius and ulna; interosseous membrane.
    • Insertion= base of proximal and and distal phalanx of thumb.
    • Action= Extends thumb.