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Senses (Anatomy of eye (Three tunics (layers) (Outer tunic (Cornea -…

- - - - Cornea - Transparent, thick layer that allows light to pass through
      - Sclera - white covering, allows extrinsic muscle attachment
      - Optic nerve - Cranial nerve II, that carries retinal ganglionic cell axons to brain
    - - Choriod coat - between sclera and retina, covers entire posterior part of eye, dark pigments that help absorb light
        
        Dark pigments do not detect very well
      - Ciliary body - composed of muscles, processes, and ligaments arranged in a ring around the lens
        
        Muscles pull on lens via suspension ligaments, changing the shape of the lens to a rounded or oval shape
        
        Accommodation - how our eyes see up close and far away
      - Iris - colored part of the eye
        
        Pupil - black center of the eye. ANS controls dilation and constriction of pupils
    - - Retina - responsible for vision
  - - - Conjunctiva - outermost layer of eyelid, continuous through sclera, to edge pf cornea. Thin membrane that contains secretory epithelium Lubricate eye for eyelid closure
        
        Pink eye
    - - Made of lacrimal gland, lacrimal ducts, and lacrimal sac. purpose is to produce tears
        
        In eye secretion the enzyme lysosome is important for fighting off bacterial infections
      - Located superior and lateral to eye and secretes tears, which are released into sclera of eye
- - - - The slower the wavelength the more towards the red end of the wavelength
        
        Light can be reflected and bent (refraction is bent light, refraction occurs when light hits your cornea)
  - - - Light goes through this first, because of the dark pigment. The AP travels through neurons to front layer of retina
    - - Rods contain pigment called rhodopsin (molecule affected by light
        
        Light -- rhodopsin -- opsin & retinal
- - - - We are displacing the air around us with sound and air
    - - Waves travel through ear to tympanic membrane, moving through ear bones, as mallecus, incus, and stapes.
        
        Stapes is covering a membrane on the cochles called the oval window
        
        Have receptors called hair cells
    - - Sound waves to tympanum
        
        Vibration moves to ossicles
        
        Stapes hits oval window sending pressure waves through vestibular duct
        
        Distort the basilar membrane
        
        Vibration of basilar membrane causes vibration of hair cells against tectoral membrane which stimulates sensory neurons
        
        Relayed to CNS via cranial nerve VIII
- - - - Bulb takes info to and convertes chemical to smell