Anatomy 1: PNS Revision

Question 1

How many pairs of spinal nerves are there?

Answer 1

31

Question 2

How many spinal nerves are in each section?

Answer 2

8 Cervical C1-C8
12 Thoracic T1-T12
5 Lumbar L1-L5
5 Sacral S1-S5
1 Coccygeal Co1 (not always present)

Question 3

Nerves are numbered according to the associated vertebrae, does the nerve exit the spine above or below the vertebrae?

Answer 3

C1-C7 above vertebrae

C8 onwards, below

Question 4

Generally a plexus is formed from anterior or posterior rami?

Answer 4

Anterior

Question 5

MOTOR axons pass from the __ horn of spinal cord into the __ rootlets then into the __ root then into the spinal nerve

Answer 5

Anterior

Question 6

SENSORY axons pass from the spinal nerve into the __ root then into the __ rootlets then into the __ horn of the spinal cord

Answer 6

Posterior

Question 7

What 3 things does a spinal nerve pair supply a body segment with?

Answer 7

General sensory supply to all structures
Somatic motor supply to skeletal muscles
Sympathetic nerve supply to skin and smooth muscle of arterioles

Question 8

Dermatome map is AKA

Answer 8

Foerster map

Question 9

T/F there is overlap of skin innervation by adjacent spinal nerves

Answer 9

True

Question 10

T/F a myotome deep to a dermatome will always be from the same spinal nerve

Answer 10

False

Question 11

Posterior scalp, neck and shoulder supplied by

Answer 11

C2-C4

Question 12

Upper limb supplied by

Answer 12

C5-T1

Question 13

Lower limb, gluteal region + perineum supplied by

Answer 13

L2-Co1

Question 14

C2-C4 cutaneous supply

Answer 14

Posterior scalp, neck and shoulder

Question 15

C5-T1 cutaneous supply

Answer 15

Upper limb

Question 16

L2-Co1 cutaneous supply

Answer 16

Lower limb, gluteal region + perineum

Question 17

Dermatome landmark: nipple supplied by

Answer 17

T4

Question 18

Dermatome landmark: bellybutton supplied by

Answer 18

T10

Question 19

C1-C4 forms the __ plexus

Answer 19

Cervical

Question 20

Which nerves form the cervical plexus?

Answer 20

C1-C4

Question 21

C5-T1 forms the __ plexus

Answer 21

Brachial

Question 22

Which nerves form the brachial plexus?

Answer 22

C5-T1

Question 23

L1-L4 forms the __ plexus

Answer 23

Lumbar

Question 24

Which nerves supply the lumbar plexus?

Answer 24

L1-L4

Question 25

L5-S4 form the __ plexus

Answer 25

Sacral

Question 26

Which nerves supply the sacral plexus?

Answer 26

L5-S4

Question 27

Two plexuses spanning from L1-S4 are often referred to as the __ plexus

Answer 27

Lumbosacral