Visual Pathway/Signal Traveling

Question 1

Optic Nerve

Answer 1

1st order neurons

Question 2

Optic Chiasm

Answer 2

Fibers from nasal retina decussate

Question 3

Optic tract

Answer 3

Carries both nasal and temporal fibers

Question 4

Lateral Nucleus

Answer 4

2nd order neurons

Question 5

Optic Radiation

Answer 5

To visual cortex

Question 6

Optic Nerve Injury

Answer 6

Blind in one eye

Question 7

Optic Chiasm Injury

Answer 7

Bitemporal hemianopia

Question 8

Optic Track Injury

Answer 8

Homonymous hemianopia

Question 9

Signal through Chemical Synapse

Answer 9

Signal on presnaptic neuron reaches axon terminal
Signal trigger Ca++ ion channels open, Ca++ influx;
Elevated Ca++ causes presynaptic vesicles undergo exocytosis, neurotransmitters released into snaptic cleft
Neurotransmitters bind to postsynaptic membrane receptors, trigger postsynaptic neuron response (excitatory or inhibitory)
Neurotransmitters destroyed in cleft or retaken to presynaptic neuron