Canine Pelvic Limb Nerves

Question 1

The obturator n. innervates __________.

Answer 1

The obturator n. innervates external obturator, pectineus m, adductor m.

Question 2

The femoral n. innervates __________.

Answer 2

The femoral n. innervates sartorius m, quadriceps mm.

Question 3

The **saphenous n. **innervates __________.

Answer 3

The saphenous n. innervates sartorius m.

Question 4

The pudendal n. innervates __________.

Answer 4

The **pudendal n. **innervates internal reproductive structures.

Question 5

The caudal rectal n. innervates __________.

Answer 5

The caudal rectal n. innervates external anal sphincter.

Question 6

The **perineal n. **innervates __________.

Answer 6

The **perineal n. **innervates muscles of penis or vestibule/vagina.

Question 7

The caudal gluteal n. innervates __________.

Answer 7

The **caudal gluteal n. **innervates superficial gluteal m.

Question 8

The cranial gluteal n. innervates __________.

Answer 8

The **cranial gluteal n. **innervates middle & deep gluteal muscles, tensor fasciae latae m.

Question 9

The sciatic n. innervates __________.

Answer 9

The sciatic n. innervates internal obturator m, gemelli m, quadratis femoris m.

Question 10

The **common peroneal n. **innervates __________.

Answer 10

The common peroneal n. innervates cranial tibial m, peroneus longus m, long digital extensor m.

Question 11

The **superficial peroneal n. **innervates __________.

Answer 11

The superficial peroneal n. innervates cutaneous zone to dorsal paw.

Question 12

The lateral cutaneous sural n. innervates __________.

Answer 12

The **lateral cutaneous sural n. **innervates cutaneous zone of lateral crus.

Question 13

The **tibial n. **innervates __________.

Answer 13

The tibial n. innervates gastrocnemius m, superficial digital flexor m, popliteus m, deep digital flexor m, sensory to plantar surface of paw.

Question 14

The caudal cutaneous sural n. innervates __________.

Answer 14

The caudal cutaneous sural n. innervates cutaneous zone of caudal surface of crus.

Question 15

Common peroneal n. and **tibial n. **are both branches of the __________ nerve

Answer 15

sciatic nerve

Question 16

The internal obturator muscle is innervated by which nerve?

Answer 16

sciatic nerve

Question 17

The external obturator muscle is innervated by which nerve?

Answer 17

obturator n.

Question 18

The cranial tibial m. is innervated by which nerve?

Answer 18

common peroneal n.

Question 19

The **internal reproductive structures **are innervated by which branch of the lumbosacral plexus?

Answer 19

pudendal nerve

Question 20

Which branch of the lumbosacral plexus innervates the sartorius m.?

Answer 20

femoral n.

Question 21

Cutaneous innervation to the dorsal paw is provided by which nerve(s)?

Answer 21

superficial & deep peroneal nerves

Question 22

Which nerves would be anesthetized in a pudendal nerve block?

Answer 22

• caudal rectal n: motor to anal sphincter
• perineal n: skin of perineum, scrotum/labium, penile m.m.
• dorsal nerve of the penis: dorsal penis, glans of the penis

Question 23

Which three nerves innervate the stifle?

Answer 23

Saphenous n. (by way of the femoral n.)

**Common peroneal n. **and tibial n. (by way of the sciatic n.)

Question 24

Where would you commonly inject for an epidural in a small animal?

Answer 24

the lumbosacral junction

Question 25

It is important to know where the phrenic nerve originates when performing epidural blocks in the lumbosacral space….

…where does the phrenic nerve originate?

Answer 25

The phrenic nerve originates at cervical nerves 5, 6, & sometimes 7.

C5, C6, C7

If the volume of epidural is too large, you may push the anesthetic cranially, along the spinal column, to affect these cervical nerves, leading to paralysis of the diaphragm and respiratory paralysis