HTHSCI 1H06 Lecture Notes - Lecture 31: Superior Oblique Muscle, Ear Canal, Upper Respiratory Tract Infection

• School: McMaster University
• Department: Health Sciences
• Course: HTHSCI 1H06
• Professor: Alexander Ball

Document Summary

Saccadic eye movements are necessary to expose the fovea to the entire scene. Problems with conjugate eye movements = diplopia (double vision) 2. contraction of both medial rectus; cn iii contraction of ciliary body muscle to focus lens. Ciliary muscles contract to see far (stretched and at) Ciliary muscles relax to see near (relaxed and round) Epithelium pumps ions to ensure dehydration capsule. Function of the iris pupillary dilator lens double layer of pigmented cells blocks all light. Temporal bone of skull: middle ear oval window membrane. Thin skin rmly attached to periosteum of bone. Ceruminous glands in skin: middle ear. Mechanical relay of vibrations of tympanic membrane to oval window membrane of inner ear. Muscles dampen the vibrations of the ossicles opening to mastoid air cells. A system of channels in the petrous portion of the temporal bone. Cochlear duct oats in perilymph, lled with endolymph .