NURS 3120 Chapter Notes - Chapter 10: Palpebral Fissure, Bony Labyrinth, Semicircular Canals
Document Summary
Chapter 10: head, eyes, ears, nose, and throat. Skull is a bony structure that protects the brain and upper spinal cord. Six bones form the skull and are fused together at sutures. External eye is composed of the eyebrows, upper and lower eyelids, eyelashes, conjunctiva, and lacrimal glands. Eyelash es curve outward from the lid margins, filtering out dirt. Two thin, transparent mucous membranes termed conjunctiva lie between the eyelids and the eyeballs. Bulbar conjunctiva covers the scleral surface of the eyeballs. Palpebral conjunctiva lines the eyelids and contains blood vessels, nerves, hair follicles, and sebaceous glands. Sclera - tough, fibrous outer layer commonly referred to as the white of the eye. Uvea - consists of the choroid posteriorly and the ciliary body and iris anteriorly. Retina - extension of the central nervous system. Vision occurs when rods and cones in the retina perceive images and color in response to varying light stimuli.
