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Senses (Gross and Microscopic Anatomy of eye (Fibrous Layer- white of eyes…
Senses
Gross and Microscopic Anatomy of eye
Fibrous Layer- white of eyes include Cornea, Sclera, and extrinsic eye muscles.
Sclera- Dense connective tissue, protective, anchor for extrinsic eye muscles, gives shape.
Cornea- Transparent- allows light into the eye. Helps focus light onto retina.
Vascular Layer- Choroid or black of eye. Absorbs light and prevents it from scattering. Nourishes the layers next to it particularly retina.
Ciliary Body-black, smooth muscle continuous with choroid. Can change shape of lens to help focus on distant or near objects.
Inner Layer- Retina-Tan, very thin, location of photoreceptors, axons from retina converge to form optic nerve.
Rods- Photoreceptors, most abundant, sensitive to light.
Cones- Sensitive to colors
Lens- to focus light onto the retina
Iris- smooth muscle anterior to iris, "eye color". Can dilate or constrict pupil to allow more or less light to enter eye.
Sensory Receptors based on type of stimulus
Thermoreceptor- Sensitive to temperature
Photoreceptor- sensitive to light
Chemoreceptor- sensitive to chemicals-blood vessels
Nociceptor- Sensitive to pain
Mechanoreceptor- Sensitive to mechanical or physical things touch, pressure,vibration,stretch.
Baroreceptor- Blood pressure
Sensory Receptors based on stimulus origin
Exteroceptors- External stimuli- sensitive from skin, special senses.
Interoceptors- Internal stimuli- sensitive from internal organs
Proprioceptors- Sensitive to stimuli from muscle, ligaments, tendons, joints.- Stretch, tells CNS about movement
Sensory Receptor- Structures that are sensitive to stimuli from their surroundings