Peripheral and spinal nerves

Question 1

What is included in peripheral nerves?

Answer 1

All cranial and spinal nerves

Question 2

How many pairs of spinal nerves do we have?

Answer 2

31

Question 3

Name the 31 pairs of cranial nerves

Answer 3

C1-8
T1-12
L1-5
S1-5
Co1

Question 4

Describe the path of nerves from the SC out

Answer 4

Grey matter -> Rootlets -> Roots -> Spinal nerve - Rami (anterior and posterior)

Question 5

What kind of fibres do ventral roots etc carry?

Answer 5

Motor

Question 6

What kind of fibres do dorsal roots etc carry?

Answer 6

Sensory

Question 7

Where are spinal nerves located?

Answer 7

Intervertebral foramen only

Question 8

What does the anterior rami supply?

Answer 8

Anterolateral

Question 9

What does the posterior rami supply?

Answer 9

Posterior

Question 10

What modalities do spinal nerves do?

Answer 10

General sensory to all structures
Somatic motor to skeletal muscle
Sympathetics

Question 11

What is a dermatome?

Answer 11

The area of the skin supplied by a single spinal nerve

Question 12

What is a myotome?

Answer 12

The skeletal muscle supplied by a single spinal nerve

Question 13

Name two important T spinal nerve dermatomes

Answer 13

T4- Nipple

T10- Umbilicus

Question 14

Which dermatomes supply the posterior scalp, neck and shoulders?

Answer 14

C2-C4

Question 15

Which dermatomes supply the upper limb?

Answer 15

C5-T1

Question 16

Which dermatomes supply the lower limb?

Answer 16

L2-Co1

Question 17

What is a plexus?

Answer 17

Intermingling of anterior rami from adjacent spinal nerves

Question 18

What are the four plexuses?

Answer 18

Cervical (C1-4)
Brachial (C5-T1)
Lumbar (L1-4)
Sacral (L5-S4)

Question 19

Which spinal levels have sympathetic output/bodies?

Answer 19

T1-L2

Question 20

Which spinal nerves have sympathetic output?

Answer 20

All

Question 21

How is the discrepancy between spinal levels and spinal nerves with sympathetic output explained?

Answer 21

Sympathetic chain