1.8 Intrinsic Muscles of the Thoracic Limb: Caudomedial Muscles of the Forearm

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Caudomedial Muscles of the Forearm

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7 Terms

1
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Pronator teres

Flexor carpi radialis

Superficial digital flexor (SDF)

Flexor carpi ulnaris

Deep digital flexor (DDF)

Pronator quadratus

name the caudomedial muscles of the forearm (6)

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Pronator teres

  • Origin: arises from the medial epicondyle of humerus

  • Insertion: converges on the insertion of the supinator on the radius/ medial border of the radius

  • Action: to rotate the forearm medially

  • Innervation: Median nerve

3
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Flexor carpi radialis

  • most medial and runs directly caudal to the subcutaneous border of the radius. It ends on the upper end of 2nd MC bone

  • Origin: medial epicondyle of the radius

  • Insertion: base of metacarpals 2 and 3

  • Action: to flex the carpal joint

  • Innervation: Median nerve

4
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Superficial digital flexor (SDF)

  • Origin: arises from the medial epicondyle of the humerus

  • Insertion: inserts on the middle phalanx of digit 2 to 5

  • Action: to flex the carpal, metacarpopharyngeal, and proximal interpharyngeal joint of digits 2-5

  • Innervation: Median nerve

5
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Flexor carpi ulnaris

  • two-headed muscle (ulnar head and humeral head) inserting on the accessory carpal bone

  • Origin: ulnar head- caudal border and medial surface of the olecranon, humeral head- medial epicondyle of the humerus

  • Insertion: accessory carpal bone

  • Action: to flex the forepaw with abduction

  • Innervation: Ulnar nerve

6
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Deep digital flexor (DDF)

  • three-headed muscle arising from the humerus , radius, and ulna.

  • It inserts on the distal phalanx.

  • Origin: humeral head-medial epicondyle, ulnar head-caudal border of ulna, radial head-medial border of the radius

  • Insertion: flexor tubercle of the distal phalanx on each digit

  • Action: to flex the forepaw

  • Innervation: Ulnar nerve and Median nerve

7
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Pronator quadratus

  • Found only in carnivores

  • It passes from the shaft of the ulna to that of the radius , bridging the medial aspect of the interosseous space of the forearm

  • Supplied by median nerve

  • Origin: apposed surfaces of the radius and ulna

  • Insertion: apposed surfaces of the radius and ulna

  • Action: to pronate the paw

  • Innervation: Median nerve