IMED3002 Lecture Notes - Lecture 4: Short Ciliary Nerves, Iris Sphincter Muscle, Nasal Meatus
28 May 2020
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Document Summary
First layer: circular smooth muscles innervated by parasympathetic fibres of short ciliary nerves enabling it to contract and reduce light coming into the eye, dilator pupillae: Fibres are at 90 degrees therefore when they contract, they are pulled away from each other: resulting in the pupil to dilate. Light detected in one eye by optic nerve: afferent limb reflects it bilaterally to the left and right pretectal nucleus. Thin and transparent membrane covering the eyelids and sclera but not the cornea. Contains many goblet cells in order to prevent the eye from drying out and to moisten the surface (1000---- 56. 000 per square mm of surface: bvs and autonomic nerves to goblet cells. Supplied via opthalamic nerve (sensory fibres: autonomic innervation/supply of the eye: Sphincter pupillae- first in front of the eye. Smooth circular muscle innervated by parasympathetic fibres from the edinger-
