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Nervous System (Senses (Sense Receptors Based on Stimulus TYPE…

- - - - Fibrous Layer: SCLERA. D.R.C.T. Anchor for extrinsic eye muscles
      - Transparent Layer: CORNEA. Transparent fibrous layer. Allows light into eye. Focuses light.
      - Vascular Layer: CHOROID. Nourishes other layers. Pigment absorbs light and prevents scattering. Continuous with ciliary body: a muscle that changes shape of the lens
      - Inner Layer: RETINA. Photoreceptors. Axons from photoreceptors converge to form optic nerve. Rods detect light and dark (dim lighting). Cones detect color, best in bright light.
      - Lens: focus light
      - Iris: Colored part. Intrinsic muscle dilates/constricts pupil
    - - Anterior Segment: Cornea to Iris. Filled with Aqueous Humor to nourish lens and cornea, maintain pressure
      - Posterior Segment: Iris to Lens
    - - Filled with Vitreous Humor. Gel-like and transmits light, supports retina and lens. Maintains pressure.
  - - - Chemoreceptors found in roof of nasal cavity
      - Pseudostratified Columnar Epithelium
    - - Olfactory Sensory Neurons > Olfactory Bulb > Olfactory Tract > Limbic Region OR Primary Olfactory Cortex (temporal lobe)
  - - - Taste buds (chemoreceptors) on Tongue, Inner Cheeks, Pharynx, Palate, and Epiglottis
      - CRANIAL NERVES: 1) Facial Nerve
        2) Glossopharangeal Nerve 3) Vagus Nerve
  - - - Auricle (pinna): Gathers & funnel sound waves, amplify
      - Tymponic Membrane: Vibrates, transmits vibrations.
      - Middle Ear: Auditory ossicles here and transmit vibrations to Cochlea
      - Cochlea: Fluid Filled and has mechanoreceptors.