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Muscles

Muscles of the forelimb

TermDefinition
Muscle root terms Myo- Mys- My- Sarco-
Ligaments attach bones to other bones
Tendons Attach muscles to bones
Deltoid overlays shoulder laterally
Origin of deltoid spine of the scapula
Insertion of deltoid deltoid ridge of humerus
Action of deltoid Flexion of humerus and lateral rotation of humerus
Supraspinatus located in supraspinous fossa of scapula
Origin of Supraspinatus scapular spine
Insertion of Supraspinatus greater tubercle of humerus
Action of Supraspinatus extends shoulder and counteracts deltoid
Infraspinatus Fills infraspinous fossa
Origin of Infraspinatus scapular spine
Insertion of Infraspinatus lateral surface of greater tubercle of the humerus
Action of Infraspinatus lateral rotation of humerus
Triceps Brachii comprised of three heads and is the caudal aspect of humerus
Origin of Triceps Brachii mostly proximal humerus
insertion of Triceps Brachii olecranon process of ulna
Action of Triceps Brachii extends elbow
Biceps Brachii Cranial aspect of humerus
Origin of Biceps Brachii supraglenoid tubercle of scapula
Insertion of Biceps Brachii Radial and ulnar tuberosities
Action of Biceps Brachii flex elbow
Brachialis lateral muscle that runs around cranial humerus
Origin of Brachialis lateral humerus
Insertion of Brachialis lateral ulna
Action of Brachialis flex elbow
Brachioradialis in carnivores, runs with cephalic vein and often mistaken for vein during venipuncture, cranial aspect of radius
Action of Brachioradialis rotates forearm
Extensor Carpi Radialis Largest extensor muscle of forearm
Origin of Extensor Carpi Radialis Lateral epicondyle of humerus
Insertion of Extensor Carpi Radialis Proximal aspect of second and third metacarpal bones
Action of Extensor Carpi Radialis extends carpus and flexes elbow
Origin of Common Digital Extensor Lateral epicondyle of humerus
Insertion of Common Digital Extensor Dorsal aspect of distal phalanges II-V (2-4)
Action of Common Digital Extensor Extends digits & carpus
Origin of Lateral Digital Extensor Lateral epicondyle of humerus
Insertion of Lateral Digital Extensor Middle phalanges II-V (2-4)
Action of Lateral Digital Extensor extends the digits
Lateral Ulnar is also called Extensor Carpi Ulnaris
Extensor Carpi Ulnaris/Lateral Ulnar longest muscle and thickest tendon
Origin of Extensor Carpi Ulnaris/Lateral Ulnar lateral epicondyle of humerus
Insertion of Extensor Carpi Ulnaris/Lateral Ulnar Proximal aspect of metacarpal V
Action of Extensor Carpi Ulnaris/Lateral Ulnar flexes carpal joint
Origin of Abductor Pollicis Longus lateral border of ulna
Insertion of Abductor Pollicis Longus proximal end of metacarpals I and II (1 and 2)
Action of Abductor Pollicis Longus Extends carpal joint and abducts digit
Origin of Flexor Carpi Radialis medial epicondyle of humerus
Insertion of Flexor Carpi Radialis Palmar aspect of metacarpals II and III (2 and 3)
Action of Flexor Carpi Radialis flex carpus
Flexor Carpi Ulnaris two heads proximally
Origin of Flexor Carpi Ulnaris medial epicondyle of the olecranon
Insertion of Flexor Carpi Ulnaris accessory carpal bone
Action of Flexor Carpi Ulnaris flex carpus
Origin of Superficial Digital Flexor medial epicondyle of humerus
Insertion of Superficial Digital Flexor palmar surface of middle phalanges II-V (2-5)
Action of Superficial Digital Flexor flexes digits and flexes carpus (less so than digits)
Deep Digital Flexor Greatest effect on digits, three headed muscle, deep on ventral aspect of antebrachium
Origin of Deep Digital Flexor humerus, radius, and ulna
Insertion of Deep Digital Flexor Palmar aspect of distal phalanges
Action of Deep Digital Flexor flex digits and flex carpus (small extent)
Extensor Retinaculum transverse carpal ligaments and holds down tendons
Created by: kenziev47
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