Thoracic Limb Innervation

Question 1

What does the musculocutaneous nerve innervate?

What is the dysfunction of this nerve

Answer 1

Innervates: corocobrachialis, biceps brachii, and brachialis m.

The cutaneous part- medial cutaneous antebrachii

Dysfunction: animal cannot offer paw, no gait abnormality

Question 2

What does the axillary nerve innervate?

Is there a dysfunction ?

Answer 2

Teres major and minor m. , deltoideus, and subscapularis muscles

Question 3

Radial nerve innervate ?

Answer 3

Extensors of elbow, carpus, digits (triceps muscles)
The deep branch is motor - carpal extensors
Superficial branch- sensory-gives lateral and medial cutaneous antebrachial that innervates the skin over the cranial and lateral surface of forearm

Question 4

If injury occurs to proximal division of the radial nerve?

Distal end ?

Answer 4

Animal would not be able to bear weight because triceps m is the main weight bearing muscle , knuckling over, loss of sensation on cranio-lateral aspect of limb distal to elbow

Paralysis of carpal and extensors , flicking of paw to compensate

Question 5

Patients with parasthesia (burning, itching, tingling) from radial nerve injuries often:

Answer 5

Chew on paw, especially over dorsal aspect

Question 6

Ulnar nerve innervates

Motor and cutaneous Innervation

Answer 6

Motor Innervation to carpal and digital flexors

Cutaneous Innervation
Caudal cutaneous antebrachii , dorsal branch, palmar branch

Question 7

The median nerve innervates

Answer 7

Pronator quadratus and pronator teres
Flexor carpi radialis
SDF/DDF

Question 8

The suprascapular nerve innervates what muscle and what happens if injury occurs

Answer 8

Supraspinatus and infraspinatus m.

Leads to muscle atrophy, shoulder slip