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Deltoideus

P: The spine and acromial process of the scapula [distal-lateral]
D: Deltoid tuberosity [humerus proximal-lateral]

Deltoideus action

ACTION: To flex the shoulder joint

infraspinatus

P: infraspinous fossa of Scapula
D: greater tubercle of Humerus

infraspinatus action

stabilize shoulder joint

Teres minor

P: The infraglenoid tubercle and distal third of the caudal border of the scapula [caudal distal]
D: The teres minor tuberosity of the humerus [proximal lateral]

Teres minor action

ACTION: To flex the shoulder joint, rotate the shoulder laterally, and prevent medial rotation when bearing weight

supraspinatus

P: The supraspinous fossa
D: The greater tubercle of the Humerus [proximal - lateral]

supraspinatus

ACTION: To extend and laterally stabilize the shoulder joint

Subscapularis

P: subscapular fossa [medial - distal 2/3rds of scapula]
D: lesser tubercule of humerus [medial proximal]

Subscapularis action

ACTION: stabilize the shoulder joint

Teres Major

PROXIMAL: Caudal angle, border of scapula and caudal surface of subscapularis
DISTAL: Teres major tuberosity of humerus (proximal - medial)

Teres major action

ACTION: flex shoulder, rotate the shoulder medially, and prevent lateral rotation when weight bearing
*closely associated with Latissimus dorsi

coracobrachialis

P: coracoid process of scapula [cranial distal]
D: lesser tubercle of humerus [medial-proximal]

coracobrachialis

ACTION: flex shoulder, rotate the shoulder medially, and prevent lateral rotation when weight bearing

Tensor fasciae antebrachii

P: fascia covering lateral side of latissimus dorsi
D: olecranon [caudal proximal ulna]

tensor fasciae antebrachii action

ACTION: extend elbow

4 heads of triceps brachii

long head
lateral head
medial head
accessory head

triceps brachii long head

P: caudal border of scapula
D: Olecranon

triceps brachii long head action

extend elbow/flex shoulder

triceps brachii lateral head

P: tricipital line of humerus [proximal lateral]
D: Olecranon
ACTION: extend elbow

Accessory head

P: neck of humerus [proximal caudal]
D: Olecranon [caudal proximal ulna]
ACTION: extend elbow

Medial head

P: proximal medial humerus
D: Olecranon [caudal proximal ulna]
ACTION: extend elbow

Anconeus

P: lateral supracondylar crest and the lateral and medial epicondyles of the humerus
D: olecranon of ulna [lateral proximal]
ACTION: extend elbow

biceps brachii

P: supraglenoid tubercle [distal cranial scapula]
D: ulnar and radial tuberosities [medial-proximal radius and ulna]

biceps brachii action

flex elbow

Brachialis

P: proximal third of the lateral surface of the humerus
D: ulnar and radial tuberosities [medial-proximal radius and ulna]
ACTION: flex elbow

Extensor carpi radialis

P: lateral supracondylar crest [lateral- distal humerus]
D: metacarpals II and III [dorsal proximal]

Extensor carpi radialis

ACTION: extend carpus

Common digital extensor

P: lateral epicondyle of humerus
D: distal phalanges (P3) of digits II, III, IV and V.

Common digital extensor

ACTION: extend joints of the 4 principle digits and the carpus

Lateral digital extensor

P: lateral epicondyle of humerus [distal proximal]
D: P1, P2 and P3 of digits III, IV and V.

Lateral digital extensor

ACTION: extend the carpus and joints of digits III, IV and V

Ulnaris lateralis

P: lateral epicondyle of humerus [distal proximal]
D: lateral/proximal metacarpal V and the accessory carpal bone

ulnaris lateralis

ACTION: abduct the manus. flex and support carpus when extended
*only flexor to arise on the lateral epicondyle.

supinator

P: lateral epicondyle of humerus [distal proximal]
D: proximal lateral radius

supinator

ACTION: rotate the forearm laterally so that the palmar side of the paw faces medially; flex elbow.

abductor digiti I longus (abductor pollicis longus)

P: lateral border and cranial surface of ulna; interosseous membrane
D: proximal end of metacarpal I

abductor pollicis longus

ACTION: abduct first digit or pollex and extend the carpal joints

Pronator teres

PROXIMAL: medial epicondyle of humerus
DISTAL: proximal medial border of the radius
ACTION: rotate forearm medially so that the palmar side of the paw faces the ground; flex elbow

Pronator teres

ACTION: rotate forearm medially so that the palmar side of the paw faces the ground; flex elbow

Flexor carpi radialis

PROXIMAL: medial epicondyle of the humerus and medial border of the radius
DISTAL: palmar side of the base of metacarpals II and III

flexor carpi radialis

ACTION: flex carpus.

Superficial digital flexor

PROXIMAL: medial epicondyle of humerus
DISTAL: palmar of the middle phalanges of digits II, III, IV and V

Superficial digital flexor

ACTION: flex carpal, metacarpohalangeal and proximal interphalangeal joints of digits II, III, IV and V

flexor carpi ulnaris heads

ulnar head
humeral head

flexor carpi ulnaris

PROXIMAL: caudal border of the proximal end of the ulna
DISTAL: accessory carpal bone

flexor carpi ulnaris action

ACTION: flex carpus

deep digital flexor

• humeral head
• ulnar head
• radial head

deep digital flexor

PROXIMAL: humeral head - medial epicondule of the humerus; ulnar head - the proximal three fourths of the caudal border of the ulna; radial head - middle third of the medial border of the radius
DISTAL: flexor tubercle on palmar surface of distal phalanx of each digit

deep digital flexor

ACTION: flex carpal and metacarpophalangeal joints and the proximal and distal interphalangeal joints of the digits.

pronator quadratus

ATTACHMENTS: apposed surfaces of radius and ulna
ACTION: pronate paw

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