Lecture 39 - Innervation of the Limbs

Question 1

what does the brachial plexus include

Answer 1

C6 - T2 (ventral branches)

Question 2

what innervates:

supraspinatus and infraspinatus

Answer 2

suprascapular n.

Question 3

what innervates:

subscapularis

Answer 3

subscapular n.

Question 4

what innervates:

deltoideus, teres major, teres minor

Answer 4

axillary n.

Question 5

what innervates:

biceps brachii
brachialis

Answer 5

musculocutaneous n.

Question 6

what arises from the musculocutaneous n.? What is the function?

Answer 6

medial cutaneous antebrachial n.; sensory

Question 7

what innervates:

triceps brachii, tensor fascia antebrachii

Answer 7

radial n

Question 8

why is the radial nerve particularly important

Answer 8

if the radial nerve is nonfunctional then the triceps is non-functioning = no elbow extension = can’t bear weight on limb

Question 9

if the radial nerve terminates deep then its function is:

Answer 9

motor

Question 10

if the radial nerve terminates superficially then its function is:

Answer 10

sensory

Question 11

what two nerves arise from a common trunk in the antebrachium

Answer 11

median and ulnar nerve

Question 12

T/F: the median nerve passes through the supracondylar foramen in cats

Answer 12

TRUE

Question 13

what does the lumbosacral plexus include

Answer 13

L4 - S3

Question 14

what are the 4 major branches of the lumbosacral plexus

Answer 14

1. femoral nerve
2. cranial gluteal nerve
3. caudal gluteal nerve
4. sciatic nerve

Question 15

what is innervated by the caudal gluteal n.

Answer 15

superficial gluteal

Question 16

what is innervated by the cranial gluteal n.

Answer 16

middle and deep gluteal m. and tensor fascia latae

Question 17

what nerve is all about stifle extension? what muscles does it innervate?

Answer 17

femoral nerve; quadriceps femoris, sartorius, iliopsoas

Question 18

what arises from the femoral nerve? what is its function?

Answer 18

saphenous n; sensory

Question 19

what is innervated by the sciatic nerve?

Answer 19

internal obturator
quadratus femoris
gemelli
biceps femoris
semitendinosus
semimembranosus

Question 20

what two branches does the sciatic nerve terminate in

Answer 20

1. tibial n.
2. common fibular n.

Question 21

what 3 sites should IM injections be given in to avoid major nerves

Answer 21

1. epaxial
2. quadriceps femoris
3. semimembranosus and semitendinosus

Question 22

what nerve innervates the caudal crus m. (gastrocnemius, extensors of tarsus)

Answer 22

tibial n.

Question 23

what nerve innervates the cranial crus m. (cranial tibial m., flexors of tarsus)

Answer 23

common fibular

Question 24

T/F: areas of sensory innervation are supplied by at least two nerves

Answer 24

FALSE - only one

Question 25

what 5 nerves in the pelvic limb have autonomous zones

Answer 25

1. sciatic 2. common fibular 3. tibial 4. saphenous 5. caudal cutaneous femoral

Question 26

what is the AZ of the caudal cutaneous femoral n.

Answer 26

caudolateral proximal thigh; branches of S1/2

Question 27

what is the AZ of the saphenous n.

Answer 27

medial crus and tarsus

Question 28

what is the AZ of the tibial and common fibular n.

Answer 28

plantar and dorsal pes respectively

Question 29

what is the AZ of the sciatic n.

Answer 29

caudal curs, common fibular, and tibial n.

Question 30

what 3 nerves in the thoracic limb have autonomous zones

Answer 30

1. radial 2. ulnar 3. musculocutaneous

Question 31

what are the divisions of the radial nerve

Answer 31

lateral cutaneous antebrachial medial and lateral branches

Question 32

what are the divisions of the ulnar nerve

Answer 32

caudal cutaneous antebrachial dorsal ulnar branch

Question 33

what is different about the palmar nerves in cats compared to dogs

Answer 33

the branches of the ulnar and median n. do not anastomose there is an AZ for the median n. on digits I-III