Anatomy 1: CNS Revision

Question 1

What are the main parts of a neuron

Answer 1

body (soma)
dendrite
myelin sheath
axon/nerve fibre

Question 2

what are the most common types of neurones

Answer 2

multipolar ( cell body in cns)

unipolar (body in PNS)

Question 3

what is a nerve cell body in the cns

Answer 3

nucleus

Question 4

what is a nerve cell body in the pns

Answer 4

ganglion

Question 5

what is a bundle of axons in the cns

Answer 5

tract

Question 6

what is a bundle of axons in the pns

Answer 6

nerve

Question 7

which cranial nerves are special sensory

Answer 7

I, II, VIII

Question 8

which cranial nerves are somatic motor

Answer 8

IV, VI, XI, XII

Question 9

where do spinal nerves supply

Answer 9

the soma

Question 10

where are spinal nerves located

Answer 10

the intervertebral foramina

Question 11

where do all sensory axons pass

Answer 11

from the spinal nerve to the posterior root and rootlets and then the posterior horn

Question 12

where do all motor axons pass

Answer 12

fromt he anterior horn of the spinal cord to the anterior rootlets then the anterior root then the spinal nerve

Question 13

which cranial nerves are mixed

Answer 13

oculomotor
trigeminal 
facial
glossopharyngeal
vagus

Question 14

what are nerve plexuses

Answer 14

intertwined ANTERIOR RAMI

Question 15

what is innervated by the cervical plexus

Answer 15

C1-4

posterior scalp, neck , diaphragm

Question 16

what plexus innervates the upper limb

Answer 16

brachial (C5-T1)

Question 17

what innervater the lower limb

Answer 17

lumbar plexus (L1-4)

Question 18

what is the sacral plexus and where does it innervate

Answer 18

L5-S4

lower limb, gluteal region, perimeun

Question 19

what is a dermatome

Answer 19

the dermatome of each spinal nerve is the area of skin supplied by both the anterior and posterior ramus of that spinal nerve

Question 20

what is a myotome

Answer 20

the myotome of each spinal nerve is the sketal muscles supplies with motor innervation by both the anterior and posterior ramus of that spinal nerve

Question 21

Where does the sympathetic outflow exit the spinal cord

Answer 21

T1-L2

Question 22

which segments of the spinal cord have lateral horns

Answer 22

T1-L2

Question 23

where do presynaptic sympathetic axons leave the spinal cord

Answer 23

the anterior rootlets/roots

Question 24

what are the signs of horners syndrome

Answer 24

ipsilateral ptosis
ipsilateral miosis (pinpoint pupil)
reduced sweating of ipsilateral facial skin

Question 25

where do all presynaptic parasympathetic axons leave the cns

Answer 25

via cranial nerves III, VII, IX, X and via sacral spinal nerves