Nerves and vessels

Question 1

True or false: The ulnar and median nerves have a common trunk.

Answer 1

True. they start together at the brachial plexus; these two work together

Question 2

True or false: The cranial pectoral nerve supplies the deep pectorals and the caudal pectoral nerve supplies the superficial pectorals.

Answer 2

False, the CRANIAL pectoral n. supplies the superficial pectorals and the CAUDAL pectoral n. supplies the deep pectorals

Question 3

If the lateral thoracic nerve is cut, what cutaneous innervation is compromised?

Answer 3

The ability to twitch the cutaneous trunci is compromised, because the lateral thoracic n. is the sole innervator of the cutaneous trunci.

Question 4

Which two muscles are supplies by the suprascapular nerve? What common clinical sign would you see if this nerve were compromised?

Answer 4

The supraspinatus and infraspinatus muscles; there would be noticeable muscle atrophy of both, allowing for the spine of the scapula to become clearly visible.

Question 5

What muscle is innervated by the subscapular nerve? If the nerve were injured, would the animal be capable of bearing weight?

Answer 5

…. The subscapularIS…. obviously. The animal could still bear weight because the subscapularis is not the only muscle responsible for adduction of the limb (ie. superficial pectorals)

Question 6

Which muscles are supplied by the axillary nerve?

Answer 6

Teres major
Teres minor
Deltoideus
Subscapularis

Question 7

True or false: the Thoracodorsal nerve supplies more than one muscle.

Answer 7

False, it only supplies the latissmus dorsi, which is solely responsible for the “digging motion” of drawing the thoracic limbs caudally.

Question 8

What action is compromised if the musculocutaneous nerve is damaged?

Answer 8

The animal cannot flex the elbow “Shake hands”

The musculocutaneous nerve supplies the biceps brachii, brachialis, and the coracobrachialis

Question 9

Where does the musculocutaneous nerve supply cutaneous innervation?

Answer 9

Autonomous zone: The medial antebrachium

Question 10

The radial nerve is damaged, what clinical signs do you see?

Answer 10

Loss of extension of all joints other than the shoulder, INABILITY to bear weight. (the radial nerve supplies all extensor muscles of the elbow, carpus, and joints)

Question 11

What cutaneous zone is supplied by the radial nerve?

Answer 11

The cranial-lateral antebrachium and dorsal paw/manus

Question 12

What cutaneous zone does the median nerve supply?

Answer 12

Palmer manus

Question 13

The median nerve supplies which muscles?

Answer 13

SDF
FCR
DDF (part of it)
Pronator teres
Pronator quadratus

Question 14

True or false: The ulnar nerve only supplies the flexor carpi ulnaris.

Answer 14

False, it also supplies part of the DDF in conjunction with the median nerve.

Question 15

Is any sensation lost if the ulnar nerve is severed?

Answer 15

Yes, sensation to lateral aspect of the front limb (antebrachial and metacarpus) and fifth digit are compromised.

Question 16

What spinal nerves supply the brachial plexus?

Answer 16

Cervical nerves 6, 7, 8

Thoracic nerves 1, 2

Question 17

What two bony prominences does the ulnar nerve pass between?

Answer 17

The medial epicondyle and the tuber olecranon

Question 18

Describe the flow of blood from within the thoracic cavity starting with the subclavian artery.

Answer 18

Subclavian—- axillary (after the first rib)—- Brachial (after caudal circumflex humeral)—- Median (after deep antebrachial)

Question 19

True or false: The Bicipital artery supplies the triceps and the deep brachial artery supplies the biceps.

Answer 19

False, the BIcipital supplies the BIceps and the deep brachial supplies the triceps.

Question 20

What is the principal source of blood flow to the palmar paw in the thoracic limb?

Answer 20

The median artery

Question 21

Which vein does the superficial branch off of the radial nerve run with?

Answer 21

The cephalic vein

Question 22

In counterclockwise motion, name the branches of the brachial plexus.

Answer 22

"Some Silly Asses Really Can Move"
Suprascapular
Subscapular
Axillary
Radial
Common trunk (median and ulnar)
Musculocutaneous

Question 23

This artery passes across the axillary lymph node, a good indicator for which artery you are looking at.

Answer 23

The lateral thoracic artery (supplies deep pectorals, latissmus, cutaneous trunci)

Question 24

Superficial pectorals are supplied by which artery?

Answer 24

The external thoracic artery.

Question 25

Why is the transverse cubital named as such?

Answer 25

Because it TRANSVERSES the CUBIT joint…. think 90 degree angle at the elbow