Chapter 16 - Chapter 16 Special Senses Vision and Light 0....

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Chapter 16 Special Senses Vision and Light 0. Vision – Visible light 0. electromagnetic radiation with wavelengths from _______ nm 1. must cause a photochemical reaction to produce a nerve signal 0. radiation below 400 nm; energetic, kills cells 1. radiation above 750 nm; too little energy to cause photochemical reaction External Anatomy of Eye Eyebrows and Eyelids 1. Eyebrows provide facial expression 2. Eyelids (palpebrae) 2. block foreign objects, help with sleep, blink to moisten 3. meet at corners (commissures) 4. consist of orbicularis oculi muscle and tarsal plate covered with skin outside and conjunctiva inside 5. tarsal glands secrete oil that reduces tear evaporation 6. eyelashes help keep debris from eye Conjunctiva 0. Transparent mucous membrane lines eyelids and covers anterior surface of eyeball except cornea 1. Richly innervated and vascular (heals quickly) Lacrimal Apparatus 2. Tears flow across eyeball help to wash away foreign particles, help with diffusion of O 2 and CO 2 and contain bactericidal enzyme Extrinsic Eyes Muscles 3. 6 muscles inserting on eyeball
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0. 1. Innervated by cranial nerves III, IV and VI Tunics of the Eyeball 0. Fibrous layer - 1. Vascular layer – Internal layer – Optical Components 3. Structures refract light to focus on retina
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Chapter 16 - Chapter 16 Special Senses Vision and Light 0....

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