Senses Flashcards

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0
Q

Which photoreceptors are responsible for colour vision?

Where are the majority of these photoreceptors located?

A

Cone cells

Fovea

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1
Q

What part of the retina is a blind spot?

A

Optic disc

Where optic axons leave eye

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2
Q

Which cells from the DIRECT pathway from photoreceptors to ganglion cells?

Which cells form the INDIRECT pathway?

A

DIRECT: Bipolar cells

INDIRECT: horizontal/amacrine cells

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3
Q

Describe the state of photoreceptors in the dark.

What happens in light?

A
  • Depolarized. Releasing NT

* cGMP decreases, Na channels close. NT no longer released.

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4
Q

What is the retinofugal projection ?

A

Retinofugal projection

Retina –> lateral geniculate nucleus
–> primary visual cortex

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5
Q

What is the primary visual cortex arranged into?

A
Cortical module 
(Orientation columns, ocular dominance columns, blobs)
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6
Q

What the the 3 ossicles?

A

Mallius, incus, stapes

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7
Q

Which ossicle hits oval window of cochlea?

A

Stapes

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8
Q

Where are the organ of corti and inner hair cells located?

A

Scarla media (cochlea)

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9
Q

What structure distorts cilia of inner hair cells?

A

Tectoral membrane

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10
Q

Where is the auditory complex located?

A

Superior temporal gyrus

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11
Q

Which ion causes depolarization in the mechanoelectrical transduction of sound?

A

K+ (moves IN to cilia)

K+ channels opened by flexion of cilia

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12
Q

What cranial nerve conveys auditory info to brain?

A

8

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13
Q

Where are olfactory signals sent after the olfactory bulb?

A

Pyriform cortex

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14
Q

What cranial nerve is the olfactory nerve?

A

Cranial nerve 1

Olfactory nerve = axons of olfactory cells that project into olfactory bulb

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15
Q

What kind of receptors do odorants bind to on cilia?

A

GPCRs

16
Q

What 2nd messenger is activated in olfactory transduction?

A

cAMP

opens Na and Ca channels

17
Q

Where does the pyriform cortex project onto?

A

Orbitofrontal cortex

18
Q

Which are the largest taste-sensitive structures?

A

Circumvalate papillae

19
Q

Which are the smallest papillae?

A

Fungiform

20
Q

What papillae are elongated and located at posterior lateral edge of tongue?

A

Foliate

21
Q

What is the gustatory pathway?

A

Medulla –> thalamus –> gustatory cortex

22
Q

What are the 2 substructures of the gustatory cortex?

A

Insula + operculum