HTHSCI 1H06 Lecture Notes - Lecture 12: Scarpa'S Ganglion, Elastic Cartilage, Semicircular Canals

• School: McMaster University
• Department: Health Sciences
• Course: HTHSCI 1H06
• Professor: Peter Helli

Document Summary

Vision uses 6 out of the 12 cranial nerves (3 sensory and 3 motor). Somatic motor neurons control movements of the eyeball and upper eyelid. light detection; cn v is trigeminal cornea sensations. Oculomotor (iii) nerve- has its motor nucleus in the anterior part of the. Saccadic eye movements- this is necessary to expose the entire fovea to the midbrain. It extends anteriorly and divides into superior and inferior branches, both of which pass through the superior orbital fissure into the orbit. Facial (vii) nerve- a mixed cranial nerve. Its sensory axons extend from the taste buds of the anterior two thirds of the tongue, which enter the temporal bone to join the facial nerve. scene. The fovea retina is where we actually see from and the rest of the eye helps with eye coordination. Extraocular eye muscles- 4 rectus muscles and 2 oblique muscles. The oblique eye muscles help with movement and rotation of the eyes.