Sensory I- EXAM 2 (WS 12)

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created 3 years ago by sh7606
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1

Types of Senses

1. Somatic senses
touch, temperature, pain, and proprioception at surface and position
Communicates body information to CNS
2. Special senses
Taste, smell, hearing, equilibrium, and vision

2

Sensory Pathway

Includes receptor, sensory neuron(s), and CNS

Receptors transduce mechanical, chemical, or photon energy of signal into graded potentials
GP's-AP's, to CNS
integration into perception

3

Image detection

reflected light translated into mental image
eye converts visible light to action potentials of optic nerve

4

Photoreceptors

Photoreceptors- Two types
1. Retinal rods: for low light
2. Cones: for bright light and colors

5

Parts of eye

1. Cornea
2. Pupil/ Iris
3. Lens

6

Cornea

Function- to pass light with precision
Pupil size change to adjust amount of light passing

7

Pupil/Iris

Pupil- limits quantity of light entering eye
Impacts depth of field (focused area)
Is controlled by the iris

Iris- pigmented muscle
color of eyes depends on pigment of iris
Contraction of radial muscles: dilation
also sympathetic division
Contraction of circular muscles: constriction
also parasympathetic division

8

Lens

Projects an image onto the rods and retina
Lens adapts for DISTANT objects by flattening its shape and changing the focal point of the image
adapts by ciliary muscles
Accommodation- the process of lens adaptation
Ciliary muscle- relaxes when the lens is flattened
contracted (rounded) when focusing on a near object
projects image upside down, right to left shifted
our brain corrects its perception

9

Problems of Focus

1. Hyperopia- "far sightedness"
The eyeball is too short
the image would focus behind the retina
Corrected with convex lenses
2. Myopia- "near sightedness"
The eyeball is too long
the image would focus in front of the retina
Corrected with concave lenses