CNS

Question 1

Divergence vs. Convergence

Answer 1

Receiving signals from a bunch of neurons for summation vs. sending them to a bunch of neurons for amplification

Question 2

Callostomy

Answer 2

Treat non-drug-responsive epilepsy with significant divergence which spreads across the hemisphere

Question 3

Definition of EPSP and IPSP

Answer 3

If it brings the cell to a value above threshold, it is excitatory. If not, it is inhibitory.

Question 4

Spatial vs. Temporal Summation

Answer 4

Lots of terminals activated at different sites to add up to threshold and AP according to length constant vs. one terminal activated in succession to reach before decay can take effect according to time constant

Question 5

Postsynaptic Inhibition in Spinal Cord

Answer 5

Tendon tap reflex sends sensory signals that excite motoneuron for quadriceps and excite the inhibitory neuron for the hamstring motoneuron

Question 6

Presynaptic Inhibition in Spinal Cord

Answer 6

Self induced movements cause self induced sensory input from stretch and shit that inhibits motoneuron, but descending commands cause an inhibitory interneuron to presynaptically inhibit this sensory one

Question 7

3 Differences b/w Non-NMDA and NMDA Rs

Answer 7

Fast, open at RP, and only let in Na, K, and Ca vs. Long term, require depol, and also let in Ca