Nerves - Spinal Cord Origin And The Muscles They Innervate

Question 1

Spinal cord origin of the Musculocutaneous Nerve ?

Answer 1

C6-T1

Question 2

What 3 muscles are innervated by the Musculocutaneous Nerve?

Answer 2

Biceps brachii
Brachialis
Coracobrachialis
*sensory to the medial aspect of antebrachium

Question 3

Spinal cord origin of the Axillary nerve?

Answer 3

C7-C8

Question 4

What muscles are innervated by the Axillary Nerve? (Shoulder flexors/stabilizers)

Answer 4

Deltoideus
Teres mjr
Teres mnr

axillary n. Runs with the caudal circumflex humeral a.

Question 5

Spinal cord origin of the Suprascapular Nerve?

Answer 5

C6-C7

Question 6

What muscles are innervated by the Suprascapular Nerve (shoulder extenders)?

Answer 6

Supraspinatus

Infraspinatus

Question 7

Spinal cord origin of the Radial Nerve?

Answer 7

C6-T2

Question 8

What 5 muscles are innervated by the Radial Nerve?

Elbow, carpus, and digit extensors

Answer 8

Triceps brachii
Extensor carpi radialis 
Ulnaris lateralis 
Lateral digital extensor
Common digital extensor

deep and superficial branches of radial n. Superficial brr. Runs with Cephalic v., and gives off the lateral cutaneous antebrachial n.–autonomous inn.to dorsal manus

Question 9

Spinal cord origin of the Pudendal Nerve?

Answer 9

S1-S3

Question 10

What muscles are innervated by the Pudendal Nerve?

Answer 10

External anal sphincter

Striated urethral muscle

Question 11

Spinal cord origin of the Obturator Nerve?

Answer 11

L5-L6

Question 12

What muscles are innervated by the Obturator Nerve?

Hip adductors

Answer 12

External obturator
Pectineus
Gracilis
Adductor

Question 13

Spinal cord origin of the Femoral Nerve?

Answer 13

L4-L6

Question 14

What muscles (imperative to bearing weight on the pelvic limb) are innervated by the Femoral Nerve?
(Stifle extender, hip flexor, limb supporter)

Answer 14

Iliopsoas
Quadriceps
Sartorius

Question 15

Spinal cord origin of the Sciatic Nerve?

Answer 15

L6-S1

Question 16

What muscles are innervated by the Sciatic Nerve?

Stifle flexors and hip extensors

Answer 16

Biceps femoris
Semimembranosus
Semitendinosus

Sciatic n.passes over the greater trochanter medially, to the femur on lateral side of adductor muscle

Question 17

Spinal cord origin of the Median Nerve?

Answer 17

C7-T2

Question 18

What muscles are innervated by the Median Nerve?

Carpus and digit flexors

Answer 18

Flexor carpi radialis
Superficial digital flexor

shares common trunk w ulnar n.thru carpal canal; provides sensory to palmar aspect of the paw

Question 19

Spinal cord origin of the Common Peroneal Nerve?

Answer 19

L6-L7 (S1)

Question 20

What muscles are innervated by the Common Peroneal Nerve?

Hock flexors, digit extensors

Answer 20

Peroneus longus
Lateral digital extensor
Long digital extensor
Cranial tibial

CP Nerve is cranial brr.of Sciatic Nerve on lateral aspect of leg

Question 21

Spinal cord origin of the Ulnar Nerve?

Answer 21

C8-T2

Question 22

What muscles are innervated by the Ulnar Nerve?

Carpus and digit flexors

Answer 22

Flexor carpi ulnaris
Deep digital flexor

sensory innervation to lateral surface of metacarpus and 5th digit

Question 23

Spinal cord origin of Tibial Nerve?

Answer 23

(L6) L7-S1

Question 24

What muscles are innervated by the Tibial Nerve?

Hock extenders, digit flexors

Answer 24

Gastrocnemius
Popliteus
Deep digital flexor
Superficial digital flexor

Tibial n.provides caudal/plantar innervation of distal pelvic limb, esp. sensation over plantar surface of paw

Question 25

Spinal cord origin of Pelvic Nerve?

Answer 25

S1-S3

Question 26

What muscles are innervated by the Pelvic Nerve?

Answer 26

Smooth muscle of the bladder and rectum