ANP 1106 Chapter Notes -Opsin, Ion, Postcentral Gyrus

• School: University of Ottawa
• Department: Anatomy and Physiology
• Course: ANP 1106
• Professor: Jacqueline Carnegie

Document Summary

70% of all sensory receptors in the body are in the eyes. Half of the cerebral cortex is involved in some aspect of visual processing. Accessory structures protect the eye or aid its function: eyebrows. Short, coarse hairs that overlie the supraorbital margins of the skull. Contraction of the orbicularis muscle depresses the eyebrow. Contraction of the corrugator muscle moves the eyebrow medially: eyelids. Eyelids are separated by the palpebral fissure and meet at the medial and lateral commisures. Tarsal plates support it internally and anchor the orbicularis oculi and the levator palpebrae superioris muscles that run within the eyelid. The upper eyelid is more motile because the levator palpebrae superioris raises it to open the eye. Eyelashes are richly innervated and triggers reflex blinking. Tarsal glands are embedded in the tarsal plates and produce an oily secretion that lubricates the eyelid and the eye and prevents the eyelids from sticking together: conjuctiva.