Sensory Organs and Tissues
This chapter presents the medical terminologies which are used to describe sensory organs and tissues. It discusses three types of sensory organs and tissues: the ears; the ears; and the skin. The eyes are made up of three layers. These include: the outer supporting fibres called the sclera, including the transparent cornea over the front of the eye; and the inner retina from which the optic nerve transmits visual stimuli to the brain. These also include: the pigmented choroid coat, including the ciliary body whose muscle controls the amount of light entering the pupil and the iris which gives the eye its colour. In ear, sound waves are conveyed from the external ear to the drum, the tympanic membrane, at the entrance to the middle ear. Nerve endings create the sense of touch via the skin, which also protects underlying tissues against pressure and pain, and regulates body temperature. The skin consists of: epidermis; dermis; and subcutaneous tissue.