Neuroscience- Dr Amici-Dargan

Question 1

Where are the somata of sensory neurons located?

Answer 1

Dorsal root ganglia

Question 2

In which nervous system are interneurons found?

Answer 2

CNS

Question 3

What is the basic cell type of nervous systems?

Answer 3

Neurone

Question 4

What are the parts of a neurone?

Answer 4

Cell body (axon)
Dendrites
Axon
Synaptic terminals
Synaptic transmission

Question 5

Describe the nervous system of Hydra.

Answer 5

A simple nerve net with no controlling centre that permits movement of the body and tentacles in the water
Action potentials can be conducted in all directions

Question 6

Describe the nervous system of sea anemones and corals (coelenterates).

Answer 6

Slow but coordinated movements of the tentacles and body

Tentacles much more sensitive than the body

Question 7

Describe the nervous system of jellyfish (coelenterates).

Answer 7

More complex nerve nets can initiate spontaneous rhythmic activity
Contractions to produce propulsive force
Swimming, probably not in a particular direction

Question 8

Describe the radial nervous systems in Echinoderms.

Answer 8

A modified nerve net with control of limb movements coordinated by the neural ring
No ganglia
Radial nerves can control the movements of each limb individually and the tube feet for movement and feeding

Question 9

What does evolution of bilateral symmetry lead to?

Answer 9

Cephalisation
(Having a head)
Eventually, development of a brain

Question 10

What are the consequences of segmentation?

Answer 10

Development of segmental ganglia

Coordination of movement

Question 11

What is an interneurone?

Answer 11

Neurone located between and forms a connection between other neurones