Anatomy - Nervous system

Question 1

Name all the cranial nerves

Answer 1

• CN I olfactory nerve sensory
• CN II optic nerve sensory
• CN III oculomotor nerve motor
• CN IV trochlear nerve motor
• CN V trigeminal nerve both
• CN VI abducent nerve motor
• CN VII facial nerve both
• CN VIII vestibulocochlear nerve sensory
• CN IX glossopharyngeal nerve both
• CN X vagus nerve both
• CN XI spinal accessory nerve motor
• CN XII hypoglossal nerve

Question 2

What travels through the cribriform plate of the ethmoid bone?

Answer 2

CN I olfactory nerve sensory

Question 3

What travels through the optic canal?

Answer 3

CN II optic nerve sensory

Question 4

What travels through the superior orbital fissure?

Answer 4

CN III oculomotor nerve motor
CN IV trochlear nerve motor
CN V1 trigeminal nerve both
CN VI abducent nerve motor

Question 5

What travels through foramen rotundum?

Answer 5

CN V2 trigeminal nerve both

Question 6

What travels through foramen ovale?

Answer 6

CN V3 trigeminal nerve both

Question 7

What travels through internal acoustic

meatus?

Answer 7

CN VII facial nerve both

CN VIII vestibulocochlear nerve sensory

Question 8

What travels through jugular foramen?

Answer 8

CN IX glossopharyngeal nerve both
CN X vagus nerve both
CN XI spinal accessory nerve motor

Question 9

What travels through hypoglossal canal?

Answer 9

CN XII hypoglossal nerve

Question 10

Spinal cord ends at..

Answer 10

L1/L2 IV disc level - conus medullaris

Question 11

Lumbar and sacral spinal nerve roots descend to..

Answer 11

Cauda equina (horse’s tail)

Question 12

ALL sensory axons pass from..

Answer 12

The spinal nerve into the posterior root then

into the posterior rootlets then into the posterior horn of the spinal cord

Question 13

ALL motor axons pass from..

Answer 13

Anterior horn of the spinal cord into the anterior rootlets then into the anterior root then into the spinal nerve

Question 14

What does posterior rami supply?

Answer 14

Supply small posterior strip

Question 15

What does anterior rami supply?

Answer 15

Supply the remainder of the posterior part, the lateral and the anterior parts of the strips

Supply all of the limbs

Question 16

Define dermatome

Answer 16

Area (strip) of skin supplied by both the

anterior and posterior rami of a spinal nerve

Question 17

Nipple dermatome

Answer 17

T4

Question 18

Umbillicus dermatome

Answer 18

T10

Question 19

Cervical plexus

Answer 19

C1-C4 anterior rami

Posterior scalp, neck wall …..and diaphragm

Question 20

Brachial plexus

Answer 20

C5-T1 anterior rami

Upper limb

Question 21

Lumbar plexus

Answer 21

L1-L4 anterior rami

Lower limb

Question 22

Sacral plexus

Answer 22

L5-S4 anterior rami

Lower limb, gluteal region and perineum

Question 23

What are the body wall organs?

Answer 23

Sweat glands, arrector smooth muscles, arterioles

Question 24

Sympathetic outflow

Answer 24

Passes down spinal cord

Exits spinal cord with T1-L2 spinal nerves

Travel to sympathetic chains running the length of
vertebral column
- Pass into all spinal nerves
- Anterior & posterior rami

To supply body wall structures (skin, sweat glands,
arterioles)

‘Hitch a ride’ with arteries to all head and neck organs
and skin
Travel via splanchnic nerves to reach organs

Question 25

Parasympathetic Outflow

Answer 25

All parasympathetic axons leave the CNS via
cranial nerves III, VII, IX & X and via sacral
spinal nerves