A7 Forelimb 3

Question 1

Identify the intrinsic muscles of the brachium

Answer 1

Caudal group - extensors
• triceps brachii m. (long, lateral, medial, accessory)
• tensor fascia antebrachii m.
• anconeus m.

Cranial muscles - flexors
• biceps brachii m.
• brachialis m.

Question 2

Identify the intrinsic muscles of the antebrachium

Answer 2

Craniolateral group - extensors:
Extensors of the carpus = extensor carpi radialis, extensor carpi ulnaris
Extensors of the digits = common digital extensor, lateral digital extensor
Other actions= abductor pollicis longus, supinator m.

Caudomedial group - flexors:
Flexors of the carpus = flexor carpi radialis, flexor carpi ulnaris
Flexors of the digits = superficial digital flexor, deep digital flexor
Other actions = pronator teres, pronator quadratus

Question 3

Identify the intrinsic muscles of the manus

Answer 3

Interossi m.

Question 4

Describe the actions of the intrinsic muscles acting on the elbow

Answer 4

Caudal group = extensors
- triceps brachii
- tensor fascia antebrachii
- anconeus

Cranial group = flexors
- biceps brachii
- brachialis

Question 5

Describe the actions of the intrinsic muscles acting on the carpus

Answer 5

Extensors of the carpus:
- extensor carpi radialis
- extensor carpi uInaris

Flexors of the carpus:
- flexor carpi radialis
- flexor carpi ulnaris

Question 6

Describe the actions of the intrinsic muscles acting on the digits

Answer 6

Extensors of the digits =
- common digital extensor
- lateral digital extensor

Flexors of the digits =
- superficial digital flexor
- deep digital flexor

Question 7

State the innervation of the intrinsic muscles acting on the elbow

Answer 7

Caudal group extensors = innervated by radial nerve
- triceps brachii
- tensor fascia antebrachii
- anconeus

Cranial group flexors = innervated by musculocutaneous nerve
- biceps brachii
- brachialis

Question 8

State the innervation of the intrinsicmuscles acting on the carpus

Answer 8

Extensors of the carpus = innervated by radial nerve
- extensor carpi radialis
- extensor carpi ulnaris

Flexors of the carpus
- flexor carpi radialis = innervated by median nerve
- flexor carpi ulnas = innervated by ulnar nerve

Question 9

State the innervation of the intrinsic muscles acting on the digits

Answer 9

Extensors of the digits = innervated by radial nerve
- common digital extensor
- lateral digital extensor

Flexors of the digits
- superficial digital flexor = innervated by median nerve
- deep digital flexor = innervated by median & ulnar nerve