Lab 5 AOIs

Pectoralis Major

A: Adducts, flexes and medically rotates arm

O: clavicle, sternum, and ribs

I: humerus (intertubercular sulcus)

Latissimus dorsi

A: adducts, extends and medially rotates arm

O: scapula, vertebral column, and iliac crest

I: humerus (intertubercular sulcus)

Deltoid

A: abducts, flexes, and rotates arm medially and laterally

O: clavicle and scapula

I: deltoid tuberosity of humerus

Trapezius

A: adducts and rotates scapula; elevation and depression of scapula

O: superior nuchal line of occipital bone and vertebral column

I: lateral clavicle and scapular spine and acromion

Levator scapulae

A: elevation of scapula, lateral neck flexion

O: transverse processes of cervical vertebrae (C1-C4)

I: medial border (scapula)

Pectoralis minor

A: stabilizes, abducts, and rotates scapula

O: ribs 3-5

I: scapula (coracoid process)

Subscapularis

A: medial rotation of arm, stabilizes humerus head in glenoid cavity

O: subscapular fossa of scapula

I: lesser tubercle of humerus

Infraspinatus

A: lateral rotation of arm, stabilizes humerus head in glenoid cavity

O: infraspinous fossa of scapula

I: greater tubercle of humerus

Supraspinatus

A: abduction of arm, stabilizes humerus head in glenoid cavity

O: supraspinous fossa of scapula

I: greater tubercle of humerus

Teres minor

A: lateral rotation and adduction of arm, stabilizes humerus head in glenoid cavity

O: lateral boarder of scapula

I: greater tubercle of humerus

Teres major

A: medial rotation, adduction and extension of arm

O: inferior angle and lateral border of scapula

I: intertubercular sulcus of humerus

Coracobrachialis

A: flexion and adduction of arm

O: coracoid process of scapula

I: mid-shaft of humerus

Biceps brachii (long and short head)

A: supination and flextion of forearm

O: supraglenoid tubercle and coracoid process of scapula

I: radial tuberosity

Brachialis

A: flexion of forearm

O: anterior distal shaft of humerus

I: ulnar tuberosity and coranoid process of ulna

Triceps brachii (long, lateral, and medial head)

A: extension of forearm; stabilizes shoulder joint

O: infraglenoid tubercle (scapula) and proximal posterior shaft of humerus

I: olecraonon process (ulna)

Brachioradialis

A: flexion of forearm; pronation of forearm (when supinated); supination of forearm (when pronated)

O: distal shaft of humerus

I: styloid process of radius

Flexor carpi radialis

A: wrist flexion and hand abduction

O: medial epicondyle (humerus)

I: metacarpals II and III

Palmaris longus

A: wrist flexion (weak)

O: medial epicondyle (humerus)

I: palmar aponeurosis (sheet-like tendon)

Flexor carpi ulnaris

A: wrist flexion and hand adduction

O: medial epicondyle of humerus and olecranon process and posterior border (ulna)

I: pisiform and hamate (carpal bones)

Pronator teres

A: forearm pronation

O: medial epicondyle (humerus) and coronoid process of ulna

I: lateral mid-shaft of radius

Flexor pollicis longus

A: flexion of thumb

O: mid-shaft of radius; coronoid process (ulna)

I: distal phalanx of 1 (thumb)

Flexor digitorum profundus

A: flexion of wrist and fingers (2-5)

O: proximal shaft of ulna

I: distal phalanges 2-5

Flexor carpi radialis

A: Wrist flexion and hand abduction

O: medial epicondyle (humerus)

I: metacarpals II and III

Palmaris longus

A: wrist flexion (weak)

O: medial epicondyle (humerus)

I: palmar aponeurosis (sheet-like tendon)

Flexor carpi ulnaris

A: Wrist flexion and hand adduction

O: medial epicondyle of humerus and olecranon process and posterior border (ulna)

I: pisiform and hamate (carpal bones)

Pronator teres

A: forearm pronation

O: medial epicondyle (humerus) and coronoid process of ulna

I: lateral mid-shaft of radius

Extensor carpi radialis longus

A: Extension of wrist and abduction of hand

O: supracondylar ridge (humerus)

I: metacarpal II

Extensor carpi radialis brevis

A: extension of wrist and abduction of hand

O: lateral epicondyle (humerus)

I: metacarpals III

Extensor digitorum

A: extension of wrist and fingers (2-5)

O: lateral epicondyle (humerus)

I: phalanges II-V

Extensor carpi ulnaris

A: extension of wrist; adduction of wrist

O: lateral epicondyle (humerus) and ulna

I: metacarpal V

Abductor pollicis longus

A: abduction and extension of thumb

O: radius and ulna (both proximal posterior); interosseous membrane

I: metacarpal I (base)

Extensor pollicis longus

A: extension of thumb

O: ulna (posterior mid-shaft); interosseous membrane

I: distal phalanx of thumb

Supinator

A: supination of forearm

O: ulna (posterior proximal shaft); lateral epicondyle of humerus

I: radius (lateral proximal shaft)