Lab 5 AOIs BIOL 319

Dr. Lee Summer 2025

Pectoralis major; Action

Adducts, flexes, and medially rotates arm

Pectoralis major; Origin

Clavicle, sternum, and ribs

Pectoralis major; Insertion

Intertubercular sulcus of the humerus

Latissimus dorsi; Action

Adducts, extends, and medially rotates arm

Latissimus Dorsi; Origin

Scapula, vertebral column, and iliac crest

Latissimus Dorsi; Insertion

Intertubercular sulcus of the humerus

Deltoid; Action

Abducts, flexes, and rotates arm medially and laterally

Deltoid; Origin

Clavicle and scapula

Deltoid; Insertion

Deltoid tuberosity of humerus

Trapezius; Action

Adducts and rotates scapula; elevation and depression of the scapula

Trapezius; Origin

Superior nuchal line of the occipital bone and vertebral column

Trapezius; Insertion

Lateral clavicle and scapular spine and acromion

Levator scapulae; Action

Elevation of scapula, lateral neck flexion

Levator scapulae; Origin

Transverse processes of cervical vertebrae (C1-C4)

Levator scapulae; Insertion

Medial border of the scapula

Pectoralis minor; Action

Stabilizes, abducts, and rotates scapula

Pectoralis minor; Origin

Ribs 3-5

Pectoralis minor; Insertion

coracoid process of the scapula

Subscapularis; Action

Medial rotation of arm, stabilizes humerus head in glenoid cavity

Subscapularis; Origin

subscapular fossa of the scapula

Subscapularis; Insertion

Lesser tubercle of the humerus

Infraspinatus; Action

Lateral rotation of the arm, stabilizes the humerus head in the glenoid cavity

Infraspinatus; Origin

infraspinous fossa of the scapula

Infraspinatus; Insertion

Greater tubercle of the humerus

Supraspinatus; Action

Abduction of the arm, stabilizes head of humerus in glenoid cavity

Supraspinatus; Origin

Supraspinous fossa of the scapula

Supraspinatus; Insertion

Greater tubercle of the humerus

Teres Minor; Action

Lateral rotation and adduction of arm, stabilizes head of humerus in glenoid cavity

Teres Minor; Origin

Lateral border of the scapula

Teres Minor; Insertion

Greater tubercle of the humerus

Teres Major; Action

medial rotation, adduction and extension of arm

Teres Major; Origin

Inferior angle and lateral border of scapula

Teres Major; Insertion

Intertubercular sulcus of humerus

Coracobrachialis; Action

Flexion and adduction of arm

Coracobrachialis; Origin

Coracoid process of scapula

Coracobrachialis; Insertion

Mid-shaft of humerus

Biceps brachii (long and short head); Action

Supination and flexion of forearm

Biceps brachii (long and short head); Origin

Supraglenoid tubercle and coracoid process of scapula

Biceps Brachii (long and short head); Insertion

Radial tuberosity

Brachialis; Action

Flexion of forearm

Brachialis; Origin

Anterior distal shaft of humerus

Brachialis; Insertion

Ulnar tuberosity and coranoid process of ulna

Triceps brachii (long, lateral, medial head); Action

Extension of forearm; stabilizes shoulder joint

Triceps brachii (long, lateral, medial head); Origin

Infraglenoid tubercle (scapula) and proximal posterior shaft of humerus

Triceps brachii (long, lateral, medial head); Insertion

Olecranon process of ulna

Brachioradialis; Action

Flexion of forearm; pronation of forearm (when supinated); supination of forearm (when pronated)

Brachioradialis; Origin

Distal shaft of humerus

Brachioradialis; Insertion

Styloid process of radius

Flexor carpi radialis; Action

Wrist flexion and hand abduction

Flexor carpi radialis; Origin

Medial epicondyle of the humerus

Flexor carpi radialis; Insertion

Metacarpals II and III

Palmaris longus; Action

Wrist flexion (weak)

Palmaris longus; Origin

Medial epicondyle pf the humerus

Palmaris longus; Insertion

Palmar aponeurosis (sheet-like tendon)

Flexor carpi ulnaris; Action

Wrist flexion and hand adduction

Flexor carpi ulnaris; Origin

Medial epicondyle of humerus and olecranon process and posterior border of ulna

Flexor carpi ulnaris; Insertion

Pisiform and hamate

Pronator teres; Action

Forearm pronation

Pronator Teres; Origin

Medial epicondyle of humerus and the coronoid process of the ulna

Pronator Teres; Insertion

Lateral mid-shaft of the radius

Flexor pollicis longus; Action

Flexion of the thumb

Flexor pollicis longus; Origin

Mid-shaft of radius; coronoid process of ulna

Flexor pollicis longus; Insertion

Distal phalanx of I (thumb)

Flexor digitorum profundus; Action

Flexion of wrist and fingers (2-5)

Flexor digitorum profundus; Origin

Proximal shaft of ulna

Flexor digitorum profundus; Insertion

Distal phalanges II-V

Supinator; Action

Supination of forearm

Supinator; Origin

Ulna (posterior proximal shaft); lateral epicondyle of humerus

Supinator; Insertion

Radius (lateral proximal shaft)

Extensor carpi radialis longus; Action

Extension of wrist and abduction of hand

Extensor carpi radialis longus; Origin

Supracondylar ridge of the humerus

Extensor carpi radialis longus; Insertion

Metacarpal II

Extensor carpi radialis brevis; Action

Extension of wrist and abduction of hand

Extensor carpi radialis brevis; Origin

Lateral epicondyle (humerus)

Extensor carpi radialis brevis; Insertion

Metacarpal III

Extensor digitorum; Action

Extension of wrist and fingers 2-5

Extensor digitorum; Origin

Lateral epicondyle of humerus

Extensor digitorum; Insertion

Phalanges II-V

Extensor carpi ulnaris; Action

Extension of wrist; adduction of wrist

Extensor carpi ulnaris; Origin

Lateral epicondyle of humerus and ulna

Extensor carpi ulnaris; Insertion

Metacarpal V

Abductor pollicis longus; Action

Abduction and extension of thumb

Abductor pollicis longus; Origin

Radius and ulna (both proximal posterior); interosseous membrane

Abductor pollicis longus; Insertion

Metacarpal I (base)

Extensor pollicis longus; Action

Extension of the thumb

Extensor pollicis longus; Origin

posterior mid-shaft of ulna; interosseous membrane

Extensor pollicis longus; Insertion

Distal phalanx of thumb