Nerves of the Thoracic Limb Flashcards
Cranial pectoral nerves
Superficial pectoral muscle
Caudal pectoral nerves
Deep pectoral muscle
Lateral thoracic nerve
Cutaneous trunci muscle
[Panniculus reflex]
Suprascapular nerve
Lateral stabilizers of the glenohumeral joint
Subscapular nerve
Subscapular muscle
Musculocutaneous nerve
Extensors of the shoulder
Flexors of the elbow
In the dog, at the level of the proximal brachium, what two nerves communicate (have a communicating branch)?
Median nerve
Musculocutaneous nerve
Axillary nerve
Stabilizers of the glenohumeral joint
Thoracodorsal nerve
Latissimus dorsi muscle
Radial nerve
Extensors of the elbow
Extensors of the carpus
Extensors of the digits
Median nerve
Pronators of the antebrachium
Ulnar nerve
Flexors of the carpus and digits
Damage to the radial nerve at the level of the proximal brachium. Clinical signs?
Inability to extend elbow
Inability to extend carpus
Inability to extend digits
[Unable to bear weight on the limb]
Damage to the radial nerve at the level of the distal brachium. Clinical signs?
Inability to extend carpus
Inability to extend digits
Loss of feeling on dorsal aspect of manus
[knuckling over]
Cutaneous zone of musculocutaneous nerve
Medial brachium and antebrachium to the level of the carpus
Cutaneous zone of ulnar nerve
Caudolateral brachium and antebrachium, fifth digit
Cutaneous zone of radial nerve
Lateral and dorsal antebrachium and manus
Cutaneous zone of brachiocephalic nerve
Cranial brachium
Cutaneous zone of axillary nerve
Caudal brachium and scapula
What forms the brachial plexus?
The ventral roots of spinal nerves C6-T2
Brachial plexus avulsion C7-T1.
Which nerve’s roots have been disturbed?
What are expected clinical signs?
Radial nerve roots damaged, animal will be unable to bear weight on the affected side
Brachial plexus avulsion C6 and C7.
Which nerve’s roots have been disturbed?
What are expected clinical signs?
Suprascapular and subscapular nerve roots
Animal will have instability in the shoulder and have difficulty advancing the limb
Brachial plexus avulsion C6-C8.
Which nerve’s roots have been disturbed?
What are expected clinical signs?
Musculocutaneous nerve roots damaged
Animal will have difficulty lifting the limb off the floor and will be unable to flex the elbow
Unilateral mieosis indicates damage to which nerve(s)?
Damage to T1, may accompany brachial plexus injury
The Panniculus reflex tests what?
Evaluates ascending pathways of C8-T1 (especially the lateral thoracic nerve)
Which two nerves pass through the carpal canal?
Ulnar nerve and median nerve
Which nerves supply the glenohumeral joint?
Axillary nerve
Suprascapular nerve
Which nerves supply the cubital (elbow) joint?
Radial nerve
Ulnar nerve
Median nerve
Musculocutaneous nerve
Which nerves supply the carpal and digital joints?
Radial nerve
Ulnar nerve
Median nerve
Damage to what nerve causes the spine of the scapula to be visible on a living animal? What species does this occur in?
Suprascapular nerve
Equine
Why are horses especially prone to Sweeney?
Horses do not have an acromion
Which two nerves share a common trunk in the canine?
Median nerve and ulnar nerve
Which two nerves share a common trunk in the equine?
Median nerve and musculocutaneous nerve
In the equine forelimb, which nerve sends a branch to join the lateral palmar nerve? Which branch is it?
Ulnar nerve, palmar branch
A canine presents to your clinic with a markedly over extended carpus, what nerve(s) do you expect to be damaged? What cutaneous zone(s) would you test?
Median and ulnar nerves
Palmar aspect of paw and lateral aspect of paw (5th digit)
