Structure of the eye and ear :: essays research papers

Structures of the eye and earWe give our ears for the hearing sense, and we use our eyes for vision.Both be very important senses and would be hard to get along without. We rely on hearing for communication, navigation, entertainment and manyother purposesNow for our eyes we use them for vision, their like our own personal cameras, both have and use lens to focus on images.The eyes respond to the visible spectrum, this spectrum is made up of wavelengths of different sizes. The shorter waves produce a purple color, while Longer wavelengths produce blue, yellow, green and orange, and the longestWaves are red. Saturation, brightness, and hue all are components used in the Visible spectrum.More than half of the sensory receptors in the body happen to belocated in the eyes, also the cerebral cortex plays a volumed role in processing Visual information.Some accessory organises of the eye are the eyelids, eyelashes, eyebrows, Lacrimal apparatus, and the extrinsic eye muscles. The eyelid s or (palpebrae) Are used for shade, whether its for sleeping or from excessive light, or from foreign objects that dont belong in the eye. While the eyelids are protecting The eye it also military services at the same time by spreading lubricates over the eyeballs.The eyelashes help protect from foreign objects and perspiration, as well do the Eyebrows . The Lacrimal apparatus is a convention of small structures, when humans Express emotions with tears, the Lacrimal apparatus helps to produce and thenDrain those tears away. There are six extrinsic eye muscles to help move each Eye the superior rectus, inferior rectus, lateral rectus, medial rectus, superior oblique and inferior oblique. Circuits in the brain stem and cerebellum tell these muscles what to do. The structure of the eye begins with the fibrous tunic, vascular tunicAnd the retina. These are all on the wall of the eyeball, the fibrous tunic consist of the cornea and the sclera. The cornea is what covers the iris, and i s the outermost layer of the eye with which light passes. The sclera or the white of the eye, this is what gives form to the eyeball. The vascular tunic has three parts to it the choroids, ciliary body, and the iris. The choroids is what provides nutrients to the surface of the retina. The ciliary body consist of ciliary muscle and the iris which is the colored part of the eye, it regulates the amount of light