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Warm Up

Warm Up. Name the outer, middle and inner coats of the eye. Explain briefly how concave glasses corrects nearsighted vision. Explain why your eyes may get puffy and watery during allergy season. Notes. Lectures posted on Blackboard Ms. Ewing under “anatomy”.

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Warm Up

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  1. Warm Up • Name the outer, middle and inner coats of the eye. • Explain briefly how concave glasses corrects nearsighted vision. • Explain why your eyes may get puffy and watery during allergy season.

  2. Notes • Lectures posted on Blackboard Ms. Ewing under “anatomy”. • Quiz Monday or Tuesday on anatomy and physiology of Eye, ear and what ever we finish. Also depends if I can get the equipment sorted for the eye lab. • Going to circle back on Nervous system.

  3. After the Eyeball • Optic Chiasma contains axons carrying impulses to brain. • Each eye processes by opposite brain half

  4. Visual Fields • Each eye sees slightly different view. • Visual perception overlaps • Binocular vision provides depth perception. • Predators have eyes in this style, facing forward to locate prey. • Prey often have eyes to the side to increase visual field

  5. Loss of binocular vision • Hemianopia is the condition where only one side is damaged. • Loss of stereoscopic vision • Fail to see objects on one side. • Food left on one side of the plate. • Partial blindness in one eye can be compensated for.

  6. Eye Muscles • Three major muscles control vision • Internal (controlled by autonomic nervous system) • Ciliary • Alters lens • Radial and circular muscles of iris • Controls pupil size • External • Control eyeball movement

  7. Pupils • Two functions • Restrict Light • Sharpen Focus • Photopupillary reflex • Restrict light from damaging photoreceptors • Accommodation pupillary reflex • Provided to provide more acute vision.

  8. Reading produces eyestrain • Ciliary muscles contract • Iris constricts • Extrinsic muscles must converge the eyes. • RESULT: eye strain • Look up and stare into the distance • Warm compresses from a warm washcloth relax muscles

  9. The Ear Second most complex sense

  10. Animals have different hearing designs • Ears with muscles to direct hearing. • Stationary ears

  11. Major parts of the ear

  12. Outer Ear • Auricle – shell shaped structure called the “ear” • External Auditory Canal • Ceruminous glands produce cerumen • Sound waves hit tympanic membrane or eardrum

  13. Middle Ear • Tympanic cavity contains air • Know the three bones or Ossicles • Malleus (Hammer) • Incus (Anvil) • Stapes (Stirrup) • Transmits vibrations from Tympanic Membrane to Oval Window

  14. Ear Health

  15. Inner Ear • Protected behind the eye socket • Bony chambers • Cochlea • Vestibule • Semicircular canals • Filled with perilymph fluid • Membranous labyrinth sacs inside the labyrinth

  16. Work on Study Sheet for ear

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