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Sensory Receptors & Anatomy of the Eye (Sensory Receptors based on…
Sensory Receptors & Anatomy of the Eye
Sensory Receptors based on Stimulus
Interoceptors
Stimuli from the inside/interior body
Located in internal organs
Not consciously aware of
Proprioceptors
Stimuli from muscles, tendons, ligaments, joints
Consciously aware of these muscle movements and location
When stretching/moving these receptors can plan next move
Exteroceptors
Stimuli from environment
Located in skin and special senses (hear, sight)
Major Parts of Eye
Iris
Dilates or constricts to allow more or less light into eye
Pupil
: Openning
Posterior to cornea
Optic Disc
Axons converge to form optic nerve
No photoreceptors "blind-spot"
Macula Lutea
Place of sharpest vision
Only cones
Posterior pole (where light goes through iris)
Fovea Centralis
Center of macula lutea
Lens
Posterior to iris (colored part)
Focus light on retina
Sensory Receptors based on Type of Stimulus
Nociceptor
Sensitive to pain (tells us we're in danger)
Mechanoreceptor
Sensitive to pressure, touch, vibration, stretch
Chemoreceptor
Sensitive to chemicals (smell)
Photoreceptor
Sensitive to light
Baroreceptor
Type of mechanoreceptor, sensitive to blood pressure
Thermoreceptor
Sensitive to cold & heat
3 Tunics of the Eye
Vascular Layer
Choroid
Gives black pigment
Absorbs light and prevents it from scattering
Nourishes other tunics
Continuous with ciliary body - muscle that changes shape of lens
Inner Layer
Retina
Contains photoreceptprs
Axons from photoreceptors converge to become optic nerve
Fibrous Layer
Sclera
Dense connective tissue
Anchor for muscles and tendons (so we can move eye)
Outter layer, protective, and gives shape
Cornea
Window that allows light into eye
Helps focus light
Rods & Cones
Rods
Sensitive to light, and shades of lightness & darkness
Used in dim lighting
We have more rods than cones
Cones
Sensitive to color
Used better in bright lighting
Posterior Segment
Maintain pressure & shape
Supports lens & cornea
Transmit light
Filled with vitreous humor - viscous liquid (thick)
Anterior Segment
Transmit light
Maintain pressure & shape
Filled with aqueous humor (more like water)
Nourishes lens & cornea