Nerves and Vessels of the Thoracic limb

Which spinal nerves make up the brachial plexus?

C6-T2

What are the named nerves of the brachial plexus?

Suprascapular n.

Axillary n.

Musculocutaneous n.

Radial n.

Median & Ulnar n.

Lateral Thoracic n.

Subscapular n.

Which nerves have an autonomous zone?

Musculocutaneous, Radial, Ulnar

The suprascapular nerve innervates which muscles?

Supraspinatus m. and Infraspinatus m.

What would damage to the suprascapular nerve look like?

lateral instability of the shoulder joint

The axillary nerve innervates which muscles?

Deltoideus m., Teres major m., Teres minor m.

The musculocutaneous nerve innervates which muscle group?

Cranial arm muscle group

What would damage to the musculocutaneous nerve present as?

Inability to flex cubital joint

Does the musculocutaneous nerve have an AZ zone? If so, where?

medial forearm

The radial nerve innervates which muscle group?

caudal arm muscle group

craniolateral forearm muscle group

What would damage to the radial nerve just proximal to the humeral joint present as?

inability to bear weight and knuckling of the manus, inability to extend the cubital, carpal, and digital joints

What would damage to the radial nerve just proximal to the cubital joint present as?

manus is knuckled over, inability to extend carpal or digital joints

Does the radial nerve have an AZ zone? If so, where?

cranial and lateral forearm, dorsal manus excluding the 5th digit

What is damage to the radial nerve called when it occurs proximal to all of its motor branches?

High radial paralysis

What is damage to the radial nerve called when it occurs proximal to the cubital joint, before its motor branches to the antebrachium?

Low radial paralysis

High radial paralysis can present clinically similar to which condition?

Brachial Plexus Avulsion (BPA)

The median and ulnar nerve innervates which muscle group?

caudomedial forearm muscle group

What would damage to the median and ulnar nerve present as?

carpus may appear "sagged", inability to flex the carpal or digital joints

Does the ulnar nerve have an AZ zone? If so, where?

caudal forearm and lateral aspect of manus including the 5th digit

The lateral thoracic nerve innervates which muscle?

cutaneous trunci

The subscapular nerve innervates which muscle?

Subscapularis m.

What would damage to the subscapular nerve look like?

medial instability of the shoulder joint

The radial nerve is formed by which spinal nerves?

C7-T2

Trace a drop of blood from the aorta to the palmar aspect of the left manus using only the main arterial trunks.

Aortic arch- left subclavian artery - left axillary artery - left brachial artery - left median artery - superficial palmar arch - palmar common digital artery of # digit

The median artery gives rise to which structure after coursing through the carpal canal on the palmar aspect?

superficial palmar arch

What are the relevant branches of the subclavian artery?

superficial cervical artery

internal thoracic artery

costocervical artery

vertebral artery

What are the relevant branches of the axillary artery?

subscapular artery -> caudal circumflex humeral artery

cranial circumflex humeral artery

What are the relevant branches of the brachial artery?

collateral ulnar artery

transverse cubital artery

common interosseous artery

What are the relevant branches of the median artery?

radial artery

deep antebrachial artery

In the cat, which artery is the primary supplier of blood to the antebrachium and manus?

radial artery

In the dog, which artery is the primary supplier of blood to the antebrachium and manus?

median artery

The supraspinatus and infraspinatus receive their blood supply from which artery/arteries?

superficial cervical artery

The detoideus, teres major, & teres minor receive their blood supply from which artery/arteries?

subscapular artery

The cranial muscles of the brachium receive their blood supply from which artery/arteries?

superficial cervical, axillary and brachial arteries

The caudal muscles of the brachium receive their blood supply from which artery/arteries?

axillary and brachial arteries

The craniolateral muscles of the forearm receive their blood supply from which artery/arteries?

brachial and median arteries

The caudomedial muscles of the forearm receive their blood supply from which artery/arteries?

brachial artery

The dorsal surface of the paw is innervated by the?

radial nerve

The palmar surface of the paw is innervated by the?

median and ulnar nerve

The accessory cephalic vein runs on the ___________ side of the manus

dorsal

The cephalic vein runs on the ___________ side of the manus

palmar