05: Thoracic Limb Nerves

Ventral branch spinal nerves that make up the brachial plexus

C6, C7, C8, T1, T2

Plexus

Meshwork of something

How are nerves associated with multiple spinal sections

Nerves are made of recombined branches off multiple spinal cord segments. Ex: Suprascapular has parts from C5-7

All flexors of thoracic carpus and digits are fed by what nerves

Median and ulnar

What is the “key nerve of the forelimb”

Radial

Branches of the radial nerve

Superficial and deep

Superficial radial nerve branch function

Cutaneous innervation of the manus

Deep radial nerve branch function

Innervation of carpus and digital extensors

What dorsal manus sensory innervation does the radial nerve provide in the dog

Digits I-IV and axial V

What dorsal manus sensory innervation does the ulnar nerve provide in the dog

Abaxial V

What dorsal manus sensory innervation does the median nerve provide in the dog

None :)

What palmar manus sensory innervation does the radial nerve (sup and deep) provide in the dog

None :)

What palmar manus sensory innervation does the ulnar nerve provide in the dog

I-IV and V abaxial

What palmar manus sensory innervation does the median nerve provide in the dog

I-IV (with ulnar)

What dorsal manus sensory innervation does the radial nerve provide in the cat

I-III and axial IV

What dorsal manus sensory innervation does the ulnar nerve provide in the cat

Abaxial IV and all of V

What dorsal manus sensory innervation does the median nerve provide in the cat

None :)

What palmar manus sensory innervation does the radial nerve provide in the cat

None :)

What palmar manus sensory innervation does the median nerve provide in the cat

I-III and axial IV

What palmar manus sensory innervation does the ulnar nerve provide in the cat

Abaxial IV and all of V

Summary of how feline manus sensory innervation is different than canine

• On dorsal and medial aspects think -1 for cats

• On palmar aspect, the median and ulnar nerves don’t anastomose

Autonomous zone

A region of the skin that is innervated by a singe nerve

Structures supplied by the proximal division of radial nerve

Elbow extensors

Structures supplied by the distal division of the radial nerve

Craniolateral extensors and sensory for manus and craniolateral antebrachium

Symptoms of proximal radial nerve injury

Loss of elbow extension, manus extension, and sensation in manus

Symptoms of distal radial nerve injury

Can still use elbow extension (can walk!), but loss of manus extension and sensation

Avulsion of nerve

Nerve is torn from root, causes permanent paralysis

Lymph nodes of the thoracic limb

Superficial cervical and axillary