Nerves of the Equine Forelimb.

Question 1

What is the major plexus that supplies the forelimb?

Answer 1

The brachial plexus.

Question 2

What nerves form the brachial plexus?

Answer 2

Cervical nerves 6, 7 and 8.

Thoracic nerves 1 and 2.

Question 3

Is the musculocutaneous nerve an independent structure in the equine forelimb?

Answer 3

No.

Question 4

What forms the musculocutaneous nerve in the equine forelimb?

Answer 4

Branches from the median nerve.

Question 5

What is innervated by the proximal branch of the musculocutaneous nerve?

Answer 5

The coracobrachialis and the biceps brachii muscles.

Question 6

The proximal branch of the musculocutaneous nerve branches off what nerve?

Answer 6

The median nerve.

Question 7

The distal branch of the muculocutaneous nerve is a branch of what nerve?

Answer 7

The median nerve.

Question 8

Where does the distal branch of the muculocutaneous nerve emerge from on the limb?

Answer 8

Just distal to the elbow.

Question 9

What innervated by the distal branch of the musculocutaneous nerve?

Answer 9

The brachialis muscle.

Question 10

The nerves at the level of the scapula tend to be what nerve?

Answer 10

The suprascapular nerve, the subscapular nerve.

Question 11

The nerves at the level of the shoulder tend to be what nerves?

Answer 11

The axillary nerves and the radial nerve.

Question 12

The nerves at the level of the brachium tend to be what nerve?

Answer 12

The ulna nerve.

Question 13

Where is the ulna nerve found on the brachium?

Answer 13

On the caudal border of the long head of the triceps.

Question 14

What are the 2 major nerves of the distal forelimb in the horse?

Answer 14

The median nerve.

The ulnar nerve.

Question 15

Are there any independent dorsal nerves in the distal forelimb in the horse?

Answer 15

No.

Question 16

What are perissodactiles?

Answer 16

Odd toed ungulates.

Question 17

What are pentadactiles?

Answer 17

Animals with an even number of toes.

Question 18

What is the manus region of the forelimb/.

Answer 18

The carpus and the area distal to the carpus.

Question 19

In pentadactiles the axial and abaxial dorsal digital nerves are the terminal branches of what nerves?

Answer 19

Digits 1-4 are supplied by the radial nerve.

Digit 5 is supplied by the ulnar nerve.

Question 20

In pentadactiles the axial and abaxial palmar digital nerves are the terminal branches of what nerves?

Answer 20

Digits 1 and 2 are supplied by the median nerve.

Digits 3, 4 and 5 are supplied by the ulnar nerve.

Question 21

What nerves innervate the dorsal aspect of the distal limb of the horse?

Answer 21

The dorsal branches of the ulnar nerve.

The medial cutaneous antebrachial nerve.

The dorsal branches of the medial and lateral branches of the palmar digital nerve.

Question 22

The medial cutaneous antebrachial nerve is a branch of what nerve?

Answer 22

The musculocutaneous nerve.

Question 23

What 2 nerves give innervation to the mannus?

Answer 23

The median nerve.

The ulnar nerve.

Question 24

The median nerve is mainly responsible for innervating what structures of the forelimb?

Answer 24

The distal forelimb (the mannus).

Question 25

What nerves are formed by the median nerve at the level of the carpus?

Answer 25

It bifurcates at the level of the carpus to form the medial and lateral palmar nerves.

Question 26

Does the ulnar nerve provide a lot of innervation to the mannus?

Answer 26

No.

It provides little innervation to the mannus.

Question 27

What happens as the ulnar nerve reaches the mannus?

Answer 27

It overlaps with the median nerve.

Question 28

What are the 2 major branches of the ulnar nerve?

Answer 28

The ulnar nerve gives off the dorsal branch just above the carpus.

It then continues as the palmar branch which joins up with the lateral palmar branch of the median nerve.

Question 29

What area of the forelimb is supplied by the deep branch of the ulnar nerve?

Answer 29

The interosseus muscle.

Question 30

The medial nerve is on what aspect of the forelimb?

Answer 30

The medial aspect.

Question 31

The ulnar nerve is on what aspect of the forelimb?

Answer 31

The lateral aspect.

Question 32

What nerves branch off the deep branch of the ulnar nerve?

Answer 32

The lateral and medial palmar metacarpal nerves.

Question 33

Where are the medial and lateral palmar nerves in relation to the metacarpal bone?

Answer 33

They are palmar to the metacarpal bone.

Question 34

Where can the medial and lateral palmar nerves be found in the carpus?

Answer 34

In the metacarpal grooves on both sides.

Question 35

The medial palmar nerve follows what path within the carpus?

Answer 35

It runs past the carpus between the interosseus muscle and the flexor tendons.

Question 36

What branches off the medial palmar nerve at the mid metacarpal region?

Answer 36

A communicating branch that crosses over the SDFT and attaches to the lateral palmar nerve.

Question 37

The median palmar nerve originates from what nerve?

Answer 37

The median nerve.

Question 38

What aspect of the metacarpal bone are the median and lateral palmar nerves found on?

Answer 38

On the palmar aspect.

Question 39

What is the origin of the lateral palmar nerve?

Answer 39

It has a dual origin and it originates from the ulnar nerve via the palmar branch and from the median nerve.

Question 40

The lateral palmar nerve travels along what part of the carpus?

Answer 40

Along the axial surfaces of the splint bones and they terminate before the fetlock at the buttons.

Question 41

What do the medial and lateral palmar nerves become at the level of the fetlock?

Answer 41

The medial and lateral digital nerves.

Question 42

What is the path of the medial and lateral digital nerves?

Answer 42

The both pass palmar to the digital artery and over the abaxial aspect of the proximal sesamoid bones.

Question 43

What branches off the medial and lateral digital nerves at P1 and P2?

Answer 43

Dorsal branches.