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51 terms

Intrinsic muscles of antebrachium

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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