LEcture 4 : PNS

Question 1

Sensory receptors

Answer 1

Merchanorecptors
thermoreceptors
photoreceptors
chemoreceptors
noriceptors

Question 2

merchanoreceptors

Answer 2

• physical change to receptor

Question 3

thermoreceptor

Answer 3

change in temp

Question 4

photrecpetor

Answer 4

change in light

Question 5

chemoreceptor

Answer 5

change in chemicals

Question 6

noriceptors

Answer 6

pain receptor

Question 7

Proprioceptors

Answer 7

• feed back regarding degree of stretch
• found in skeltal muscles, joints, ligaments and CT coverings of bones and muscles.
• constantly advises the brain of ones movement

Question 8

Connective Tissue coverings include :

Answer 8

endoneurium
perineurium
epineurim

Question 9

Endoneurium

Answer 9

CT around a single myleniated axon

Question 10

perineurium

Answer 10

CT around a group of axons

Question 11

Epineurium

Answer 11

CT around a nerve proper

Question 12

Spinal nerves

Answer 12

31 pairs of mixed nerves arise from the spinal cord and supply all parts of the body except the head

Question 13

8 cervical

Answer 13

C1- C8

Question 14

12 thoracic

Answer 14

T1-T12

Question 15

5 Lumbar

Answer 15

L1- L5

Question 16

3 sacral

Answer 16

S1-S5

Question 17

1 coccygeal

Answer 17

C0

Question 18

Nerve plexuses

Answer 18

plexuses are found in the cervical, brachial, lumbar, and sacral regions.
T2-T12 does not have plexues

Question 19

Cervical plexus

Answer 19

-C1-C5
- cutaneous nerves of the neck, ear back of head and shoulders.
Phrenic nerve (most important) -from C3-C5
extends to the diaphragm.

Question 20

Brachial Plexus

Answer 20

C5-C8 and T1

• nerves of the upper limb
• major nerves are : musculocutaneous, median, axillary , ulnar and radial.

Question 21

Lumbar Plexus

Answer 21

L1-L4
- the thigh, abdominal wall and psoas muscle
major nerves are femoral and the obturator nerve.

Question 22

Sacral plexus

Answer 22

L4-S4
- serves the buttocks, lower limb, pelvic structures and the perineum ( genital organs)
major nerve- sciatic nerve- the longest and thickest nerve of the body.
sciatic nerve has two nerves : tibial nerve and common fibular nerve.