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Chapter 18 - The Nervous System General and Special...

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The Nervous System - General and Special Senses (494) Eye Anatomy - 3 Layers: 1. fibrous tunic (sclera & cornea) - epithelium tissue 2. vascular tunic (choroid) - layer under tunica fibrosa - connective tissue ciliary body - GVE attached to lens by suspensory ligaments (strings) connects anterior to lens forming the iris (color part of eye) suspensory ligaments in the ciliary body pull & flatten lens for focus as you get older they start to sag (prespiopia) pupil (opening) - GVE constricts by smooth muscle iris - same size since the day you were born 3. nervous tunic (retina) optic nerve - from the eye cavity through the optic canal optic chiasm When you see a picture: -the eye takes a picture - image is sent to thalamus - from thalamus to superior collicus - then to occipital lobe (478) Tongue - It is a viscera (organ) CN (V) trigeminal, (VII) facial, (IX) glossopharyngeal, (X) vegas Circumvallate papilla: circles that divide the tongue into anterior 2/3 & posterior 1/3 General Sensation -both are GVA
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