Lab 9 – Senses and sensory systems.docx

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University of Toronto Scarborough
Biological Sciences
Connie Boudens

Lab 9 – Senses and sensory systems The eye  Vitreous humor (posterior cavity): Gel-like semisolid substance found between the lens and retina  Retina: Very thing whitish layer at the back and sides of the eye. Contains photoreceptors that detect light  Cornea: transparent structure which light enters at the front of the eyeball. Powerful lens, focuses light on the retina  Iris: Pigmented muscle at the front of the eye. Surrounds the pupil and changes shape to change the size of the pupil, regulating the amount of light entering the pupil  Pupil: hole in the iris, which light enters the eye  Lens: Transparent and helps focus light on the retina. Lens can change shape to be able to focus on things at different distances  Suspensory ligaments: lens is held in place by this  Ciliary body: attachment point for the suspensory ligaments. Control the tension on the suspensory ligaments. Produce a watery fluid know as aqueous humor, fills the anterior cavity of the eye (space between the lens and cornea)  Eye muscles: six extrinsic eye muscles that help move eyeball  Sclera: white proctective outer covering of the eye and made up of strong white fibrous connective tissue  Choroid: thin layer found just outside the retina (between the retina and sclera). It absorbs light that is not absorbed by the retina  Optic disk: point of entry of the optic nerve, lacking visual receptors and creates a blind spot  Optic nerve: relays visual information from the retina to the brain Smell  Nasal cavity: either of the two cavaties lying between the floor of the cranium and the roof of the mouth and extending from the face to the face of the pharynx  Nasal conchae: responsible for forcing inhalled air to flow in a steady regular pattern around the cilia and climate-control tissue  Olfactory epithelium: specialized epithelial tissue inside the nasal cavity that is involved in smell, lies on the roof of the nasal cavity  Olfactory gland (Bowman’s gland): lie in the lamina propria of the mucosa, secret a thick pigmented mucus that trap and dissolve odiferous substances (gland located in the olfactory epithelium) Gustation (Taste)  Tongue: used for tasting, licking, swallowing, and articular speech
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