A8 Forelimb 4

Question 1

Describe the main arterial supply and venous drainage to the forelimb

Answer 1

Right thoracic limb:
Brachiocephalic trunk → right subclavian a. → right axillary a.

Left thoracic limb:
Left subclavian a. → left axillary a.

Cranial & caudal vena cava

Question 2

Identify the main arteries and veins in the forelimb

Answer 2

Subclavian a. → axillary a. → brachial a. → median a.

Cephalic v. → accessory cephalic v. → median v.

Question 3

Describe the brachial plexus

Answer 3

• Cervical spinal nerves ( C5, C6, C7 & C8)
• thoracic spinal nerves (T1, & T2)
• spinal nerves merge together to contribute to 7 peripheral nerves of forelimb & thoracic & pectoral nn.

Question 4

Identify the nerves of the forelimb

Answer 4

• Supra scapular n. (C6-C7)
• subscapular n. (C6 - C7)
• axiIIary n. (C7 - C8)
• musculocutaneous n. (C7 - C8)
• radial n. (C7-T1)
• median n. (C8-T1)
• ulnar n. (C8-T1/2)

Question 5

Describe the motor & sensory supply to the forelimb

Answer 5

Suprascapular n.
motor: supraspinatus & infraspinatus mm.

subscapular n.
motor: subscapularis m.

axiIIary n.
motor: shoulder flexors teres major, teres minor & deltoids m.
sensory: craniolateral brachium, proximal antebrachium

musculocutaneous n.
motor: elbow flexors biceps brachii, brachialis, coracobrachialis m.
sensory: medial antebrachium

radial n.
motor: extensors of elbow, carpus, digits & supinator m.
sensory: cranial & lateral antebrachium & dorsal manus

median n.
motor: flexor carpi radialis, SDF & DDF, pronator teres & quadratus mm.
sensory: palmer manus

ulnar n.
motor: flexor carpi ulnaris & deep digital flexor m.
sensory: caudal antebrachium, lateral digit V, palmer manus