topic 13

Question 1

what nerve perforate the subscapular muscle

Answer 1

C6/C7: n. subscapulare

Question 2

what nerve is located btw m. teres major and m. subscapularis

Answer 2

C6/7/8: n. axillaris

Question 3

what nerve is going to the triceps

Answer 3

C7/C8/Th1+2n. radialis

Question 4

how do you begin locating the different nerves of the brachial plexus

Answer 4

Count the first 4 from cervical and thoracic vertebrae caudal->cranial direction (TH1+2, C8, C7, C6)

Then count the next four branchings cranial->caudal

N. Suprascapularis, n. brachiocephalicus,
N. Subscapularis, N. Axillaris

Then count the next from Th1+2

N. Radialis, N. Ulnaris

Question 5

what nerve is located btw m. subscap and m. supraspinatus, and what nerve is coming out with it

Answer 5

C6/C7: N. Suprascapularis
ALSO
C6/C7: N. brachiocephalicus (going down to m. brachiocephalicus/m. omotransversarius (m. Sternocleidomastoideus)

Question 6

the most caudal of the nerves in brachial plexus

Answer 6

C8,Th1+2: N. ulnare and median fused together -> split round shoulder joint, here n. ulnare gives off a cutaneous ulna branch going caudally

Question 7

what to remember when reflecting the limb

Answer 7

keep a large chunk of latissimus dorsi and the pectorals on!

Question 8

where can you find the musculocutaneal nerve, and what does it innervate

Answer 8

MEDIAL VIEW

Runs btw the biceps muscle and medial head of tripecs. Supplies all the cranial muscles of the brachium

Question 9

where is ln. axillaris proprius found

Answer 9

btw v. subscapulare and v. thoracica lateralis (most cranial) by root to v. axillaris

Question 10

where is ln. axillaris accessorius found

Answer 10

at v. thoracica lateralis, ventrally to latiss

find the vein supf. btw deep pectoral and latissimus (with n/a): should be found along it laterally caud to the border of the two mm.

can trace the vein cranially towards it origin at v. axillaris to find the ln. ax proprius

Question 11

what parts of the scalenus mm. are found in dog

Answer 11

middle and dorsal

Question 12

name the branches of a. axillaris and what they supply

Answer 12

1. a.subscapularis - SUBSCAPULAR
2. a. circ. hum. cran. - BICEPS
3. a. thoracica externa - PECTORALS
4. a. thoracica lateralis - VENTRAL THORACIC WALL

Question 13

name the branches of the subscapular

Answer 13

1. a. circ hum caud
2. a. collateralis radialis (run with nerve)
3. a. thoracodorsalis (latisimus)
4. a. circ scapulae (supra/infraspinat)

Question 14

how many pairs of spinal nerves does the dog have

Answer 14

36

Question 15

functions of the spinal nerves of the plexus

Answer 15

originate from the ventral root which only have motor fibers, but later joined by nerves of other functions too, like sensory)

Question 16

describe the dorsal root of spinal nerve

Answer 16

bring information to CNS, and contain afferent fibers (arrive in the region), sensor fibers

ventr= efferent that exit the region

Question 17

the spinal nerves exit the vertebrae through which foramen

Answer 17

for. intervertebrale

Question 18

what is the only consistant lymph node in the forelimb

Answer 18

ln. ax proprius

Question 19

nerve not in brachial plexus originating from C5

Answer 19

n. phrenicus