CAPS 391 Lecture Notes - Lecture 34: Levator Palpebrae Superioris Muscle, Dense Irregular Connective Tissue, Nasal Meatus
2 Feb 2019
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Lecture: eye and ear frontal and maxillary bones most important in forming the orbital cavity. Levator palpebrae superioris muscle: lifts upper eyelid, tarsal plate is an attachment site. Innervated by cn iii and receives sympathetic fibres. Schematic view of sagittal section of eye to see an object close to eye you need to contract ciliary body (parasympathetic) this results in loosening of the suspensory ligaments. When looking at an object 60m or more the ciliary body relaxes and stretches suspensory ligaments (sympathetic) Iris sphincter pupillae (parasympathetic: contraction reduces diameter of pupil. Dilator pupillae (sympathetic: contraction dialates the pupils. Two major areas: anterior chamber and posterior chamber continuous through pupil, filled with aqueous humour produces by ciliary body, drainage of aqueous humour through scleral venous sinus at junction of cornea and sclera, vitreous chamber. Lacrimal apparatus lacrimal gland in superior lateral orbit of eye. Lacrimal canaliculi: ducts that collect tears. Ear external ear: auricle, external acoustic meatus, ends to tympanic membrane.
