ZOOL 2403 Boros Exam 3 TTU Questions With 100% Correct Answers.

5 cranial senses - Answer-olfaction, taste, vision, hearing and equilibrium Olfactory pathway - Answer-odor-olfactory receptors-olfactory nerves-olfactory bulbs-olfactory tractsolfactory cortex Gustatory Pathway - Answer-Taste buds are on the dorsal surface of the tongue taste-receptors- cranial nerves-medulla-gustatory cortex 6 primary taste sensations - Answer-sweet salty bitter sour umami water Cranial Nerves - Answer-Facial nerve(CN VII)- anterior 2/3s on tongue Glossopharyngeal (CN IX)- posterior 1/3 on tongue 3 Layers of the eyeball - Answer-Outer layer Middle Layer Inner Layer Outer Layer of the Eye - Answer-Dense connective tissue 1. The Sclera- White sheath protecting eyeball. 2. The Cornea- Transparent anterior continuation of the sclera that protects the lens. The cornea is avascular and can be transplanted.Middle Layer of the Eye - Answer-Loose connective tissue 1. Choroid- Contains blood vessels that supply oxygenated nutrients to the tissue of the eye. 2. Ciliary Body- Anterior continuation of the choroid, contains smooth muscle called ciliary muscles to control the shape of the lens for focusing on an object 3. Iris- Gives the eye color, it is composed of smooth muscle which change the size of the pupil to regulate the amount of light entering the eye. Inner Layer - Answer-Nervous tissue layer 1. Retina- contains photoreceptors associated with optic nerve(CN II) Rods and Cones are here Rods - Answer-Receptors activated by dim light Used for night vision Black and White vision Used for peripheral vision Cones - Answer-Receipts activated by bright light Used for daylight vision Color Vision Used for central vision Posterior Cavity - Answer-Transparent Gel(99% Water) Fills 80% of the eyeball Helps keep the retina in place Not produced until you are 4-5 Yrs old Only 1/2 full by the time you're 70 Yrs old It is not replaced. Visual Pathways - Answer-Light-Optic Receptors-Optic Nerves- Optic Chiasm-Thalamus-Visual CortexInferior Rectus - Answer-Eye looking down- Oculomotor nerve(III) Medial Rectus - Answer-Eye looking medially- Oculomotor nerve (III)