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Beatrice Mwachugu Senses (Sensory receptors based on stimulus…
Beatrice Mwachugu Senses
Sensory Receptors based on stimulus origin
Interoceptors
Stimulus is from internal organs
Proprioceptors
Stimulus is from muscles,tendons, ligaments and joints
sensitive to stretch
Informs CNS about movement
Exteroceptors
Outside stimulus like skin and special senses
Sensory receptors based on stimulus
Chemoreceptor
Sensitive to chemical like smelling a bad smell
Nociceptor
Sensitive to pain and danger
Photoreceptor
Sensitive to light
Mechanoreceptor
sensitive to touch, pressure,vibration , stretch
Thermoreceptors
Sensitive to cold and warm temperatures
Baroreceptor
Nerve ending sensitive to blood pressure
Anatomy of the eye
Has 3 layers
Vascular layer
Middle layer that nourishes other layers of the eye
Deeply pigmanted
choroid
Absorbs light
Iris
Pigmented giving color to the eye
Controls size of the pupil
Located between cornea and lens
Ciliary body
changes shape of lens
Inner layer
Retina
Has photo receptors which are sensitive to light
Photo receptors
Cons
Responsible for color vision
Rods
Provides vision in dim light
Fibrous layer
Outermost layer
Sclera
White part of the eye
Made of dense connective tissue
Functions
Anchor extrinsic eye muscles
protective
Gives shape to the eye ball
Cornea
its transparent
Functions
Allows light to pass
focus light on retina
Lens
Focusing of light by changing shape
Located behind the iris
Optic disc
No photo receptors
Blindspot
Macula lutea
Provides sharp vision
Located on the posterior of the eye
Fovea centralis
Provide clear vision
Located at the center of macula lutea
Segments of the eye
Anterior segment
Filled with aqueous humor
Nourishes cornea and lens
maintains pressure in the eye
Posterior segment
Filled with vitreous humor
Supports retina and lens
Transmits light because its transparent
Maintains pressure in the eye
Segments of the eye
Anterior
has anterior chamber and posterior
Filled with aqueous humor
Aqueous humor nourishes lens and cons
Maintain intraocular pressure
Posterior
Filled with vitreous humor