NURS 3120 Lecture Notes - Lecture 4: Palpebral Fissure, Meibomian Gland, Optic Disc
Document Summary
Head: head and neck contain multiple structures, skull encloses brain, facial structures include eyes, ears, nose, and mouth, neck structures include: Bulbar conjunctiva covers scleral surface of eyeball. Anatomy and physiology: eyes: ocular structures: ocular structures, globe of the eye, the eyeball, is surrounded by three separate layers: Cornea allows light transmission through lens to retina. Tears provide cornea with oxygen and protect surface from drying. Anatomy and physiology: eyes: uvea: ocular structures: uvea, uvea, middle layer, consists of: Choroid layer, posteriorly, which supplies blood to retina. Iris, anteriorly, is circular, muscular membrane that regulates pupil dilation and constriction via the oculomotor nerve, cranial nerve iii. Pupil, central opening of iris, allows light transmission to retina. Ciliary body, anteriorly, adjusts lens to accommodate vision at varying distances. Also produces transparent aqueous humor that flows between lens and iris. Anatomy and physiology: eye: retina: ocular structures: retina, retina, inner layer, extension of central nervous system (cns)
