Anatomy

Question 1

What does a cell body contain?

Answer 1

Contains nucleus and all the things needed to sustain the metabolic activity of the neuron.

Question 2

What is a nucleus?

Answer 2

Cluster of cell bodies with similar functions.

Question 3

What is a tract?

Answer 3

Cluster of axons with similar functions.

Question 4

What is funiculus?

Answer 4

Bundle of axons forming a raised bump on the surface of the CNS (esp. in spinal cord).

Question 5

What is fasciculus?

Answer 5

Cluster of axons forming a recognisable bundle.

Question 6

What is ganglion?

Answer 6

Collection of cell bodies.

Question 7

What are dendrites?

Answer 7

• Processes of cell membrane radiating from cell body in various directions.
• Predominantly receive information & send it to the cell body.

Question 8

What are axons?

Answer 8

• Long tubular extension of the cell membrane & cytoplasm.
• Extends towards atarget.
• Sends information away from the cell body.

Question 9

What is plasmalemma?

Answer 9

Semipermeable membrane of the neuron.

Question 10

What is nerve fibre?

Answer 10

The axon & surrounding Schwann cell.

Question 11

What are Nodes of Ranvier?

Answer 11

Junctions between Schwann cells.

Question 12

What are oligodendrocytes?

Answer 12

Specialist cells that perform myelination in the CNS.

Question 13

What are Schwann cells?

Answer 13

Specialist cells that perform myelination in the PNS.

Question 14

What are neurons?

Answer 14

Convey information by conducting electrical signals (action potentials).
– but use chemical information to pass messages from one neuron to the next (synapse).

Question 15

What is myelin?

Answer 15

Lipid (fatty) sheath that wraps around axons.

Question 16

What are interneurones?

Answer 16

Small nerves linking to other nerves.

Question 17

What is White Matter?

Answer 17

Areas of the CNS that are a large collection of neuron processes.
(Can be wrapped in white insulating layers).

Question 18

What is Gray Matter?

Answer 18

Areas of the CNS that are a large collection of cell bodies.

Question 19

What is the Circle of Willis?

Answer 19

A circular vascular anatomy the brain has evolved to limit the possibility of loss of blood supply.

Question 20

What is the conus medullaris?

Answer 20

The terminal end of the spinal cord.

Question 21

Where does the conus medullaris typically occur in the average adult?

Answer 21

L1 vertebral level.