Lumbosacral Plexus

Question 1

What area of the spinal cord make up the lumbosacral plexus

Answer 1

L1 to S3

Question 2

Cranial gluteal nerve

Answer 2

Middle gluteal, deep gluteal, tensor fascia latae

Question 3

Caudal gluteal nerve

Answer 3

Superficial gluteal

Question 4

Sciatic nerve

Answer 4

Gemelli, internal and external obturators, biceps femoris, semimembranosus, semitendinosus

Question 5

Tibial nerve

Answer 5

Gastrocnemius, superficial digital flexor, popliteus, deep digital flexor

Question 6

Superficial fibular nerve

Answer 6

Lateral digital extensor
Fibularis longus

Question 7

Common fibular nerve

Answer 7

Fibularis longus

Question 8

Deep fibular nerve

Answer 8

Cranial tibial
Long digital extensor

Question 9

What does the sciatic nerve branch into

Answer 9

Tibial nerve caudally and common fibular nerve cranially

Question 10

Femoral nerve

Answer 10

Iliopsoas
Quadriceps femoris

Question 11

Saphenous nerve

Answer 11

Sartorius

Question 12

Obturator nerve

Answer 12

External obturator
Adductor longus
Pectineus
Adductor
Gracilis

Question 13

Genitofemoral nerve

Answer 13

Motor to the cremator muscle in the male an sensory to inguinal regions in both sexes

Question 14

What nerve exits the inguinal canal

Answer 14

Genitofemoral

Question 15

Pudendal nerve

Answer 15

Innervates the internal and external genitalia, rectum, and perineal area

Question 16

What forms the lumbosacral trunk

Answer 16

Ventral branches of L6-S2

Question 17

What nerves does the lumbosacral trunk give rise to

Answer 17

Caudal gluteal
Cranial gluteal
Sciatic

Question 18

What nerve innervates the muscles that extend the stifle

Answer 18

Femoral nerve

Question 19

What nerve innervates the muscles that adduct the pelvic limb

Answer 19

Obturator nerve

Question 20

What is the largest nerve of the body

Answer 20

Sciatic

Question 21

What does the autonomic nervous system innervate

Answer 21

Smooth muscle
Cardiac muscle
Glands

Question 22

What are the collateral ganglia

Answer 22

Large ganglion away from the vertebral column associated with unpaired arteries of the aorta

Celiac, cranial and caudal mesenteric ganglia

Question 23

What is the celiomesenteric ganglia

Answer 23

Both the celiac and cranial mesenteric ganglia referred to one region

Question 24

What has parasympathetic innervation to neck, thorax and abdomen

Answer 24

Vagus nerve

Question 25

Describe the pathway of the vagus nerve

Answer 25

Vagus nerve splits into ventral and dorsal branches which unite from either side into dorsal and ventral vagal trunks along the esophagus. Both trunks continue into the abdomen where the preganglionic fibers pass through the celiomesenteric ganglion and travel with the corresponding vessels toward target organs where they synapse with postganglionic neurons on the wall of the organ

Question 26

Describe sympathetic innervation from the lumbosacral plexus

Answer 26

Preganglionic fibers leave the sympathetic trunk to synapse with postganglionic fibers at the collateral ganglia Splanchnic nerves connect the sympathetic trunk with collateral ganglia The postganglionic fibers leave collateral ganglia to innervate target organs

Question 27

What is the enteric nervous system

Answer 27

Within the walls of the GI tract which allow it to function normally if the autonomic system is damaged

Question 28

What is the pelvic plexus

Answer 28

A network of nerve fibers that supply viscera of the pelvic cavity - hypogastric n - pelvic n

Question 29

What nerve innervates the muscles that adduct the pelvic limb

Answer 29

Obturator n

Question 30

What nerve has sympathetic innervation to the rectum

Answer 30

Hypogastric n

Question 31

What nerve innervates the perineal area

Answer 31

Pudendal n

Question 32

What nerve runs laterally to gastrocnemius

Answer 32

Common fibular nerve

Question 33

What innervates the tensor fascia latae

Answer 33

Cranial gluteal n

Question 34

What nerve innervates the muscles that extends the stifle

Answer 34

Femoral n

Question 35

What had parasympathetic innervation to the stomach

Answer 35

Vagus nerve

Question 36

What has cutaneous sensation to the plantar aspect of the paw

Answer 36

Tibial nerve

Question 37

What nerve has parasympathetic innervation to the uterus

Answer 37

Pelvic nerve

Question 38

What innervates the superficial gluteal muscle

Answer 38

Caudal gluteal n

Question 39

What nerve has cutaneous sensation to the medial thigh

Answer 39

Genitofemoral n

Question 40

What nerve has cutaneous sensation to the medial stifle to hock

Answer 40

Saphenous n

Question 41

What nerve has cutaneous sensation to the dorsal aspect of the paw

Answer 41

Fibular n

Question 42

What nerve has cutaneous sensation to the lateral caudal crus

Answer 42

Sciatic nerve