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Senses (Sensory receptors based on type of stimulus (Chemoreceptor-…
Senses
Sensory Receptors
- Structures sensitive to stimuli, from their surroundings
Travel via axon of a neuron
Specialized sensory cells
Send signals to cetral nervous system
Ex. Spinal Cord
Ex. Brain
Free nerve endings
Not all sensory receptors are the same
Sensory Receptor based on stimulus origin
Interoceptors-
Sensitivity to stimuli from internal organs
*Proprioceptors
-
Sensitive to stimuli from muscle tendons , ligaments , joints
Examples
Helps coordinate your next move
Location
Deep in the muscle
Exteroceptors-
Sensory receptors that are picking up stimuli from environment .
Location
Skin
Special Senses
Sight
Smell
Hearing
Taste
Gross and microscopic anatomy of the eye
1B.Vascular layer-Choroid-
Absorbs light, prevent scattering of the light
Vascular- provides nutrition to other layers around , especially the retina
Ciliary body- Continues with choroid
Muscle-Smooth
Change shape of lens to help focus on distant or near objects
Color black very dark
1A.
Fibrous layer**
Sclera-
Dense connective tissue
White part of the eye, all around the eye
Protected
Gives shape to eye bowl( Sphere)
Anchor extrinsic eye muscle
Cornea-
Different from sclera because its transparent.
Allows light to pass through the eye
Focus light back of the eye on the retina
1C.Inner Layer- Retina*
Very thin
Location- Photoreceptors
Color- Tan
Axons from retina converge to form the optic nerve
3- Function of Iris & Lens
Iris
Color part of eye
Smooth muscle
Allow light to enter the eye
Pupil- hole in middle of eye, black
Allow light to enter eye
Dilate & constrict
Lens
Focus light on the retina by help of ciliary body
2. Functions
Rods +Cones
Rods- Most abundant ,
Sensitiv e to light
Not sensitive to color
Cones
Good in dim lights
Sensitive to color
Sensory receptors based on type of stimulus
Chemoreceptor
- Sensitivity to chemicals.
Smell
Ex.Smelling coffee
Taste
Blood vessel
Measures al the chemicals in blood
Calcium
Nociceptor
- Dangerous life threatening, sensitive to pain
Photorecepto
r- Sensitive to light
Mechanoreceptor
- Sensitive to tough , pressure, physical things, vibration , stretch
Thermoreceptor-
Different receptor for each
sensitive toCold
Hot
Baroreceptor
- Mechanoreceptors ,measure pressure blood pressure