Neuro: Lecture Review Block 1

Which part of the adult nervous system least

resembles the neural tube?

The PNS, which is derived from neural crest and, unlike CNS, not neural tube

List the elements of the CNS in a rostro-caudal sequence. What’s above, and what’s below?

1. Telencephalon

2. diencephalon

3. mesencephalon

4. metencephalon

5. myelencephalon

6. cord

What structures juxtapose the CNS?

the spinal roots next to cord, and root entry of CNs next to brainstem

Where do the two main parts of the CNS juxtapose one another?

The brain and cord meet at the foramen magnum and the spinal canal at the C1 vertebra

List the proximo-distal structures of the PNS:

• nerves

• the plexuses

• the roots

How is the PNS subcategorised by nerve cross sectional view:

• axons

• myelin sheath

• endoneurium, fasicles (perineurium), epineurium

How is the PNS subcategorised by function?

sensory

motor

How is the PNS subcategorised by sensoru structures?

• dorsal root ganglion neurons

• sensory axons

• cutaneous receptor, other sense organs