ANAT2111 Lecture Notes - Lecture 5: Orbicularis Oculi Muscle, Hair Cell, Maxilla

• School: UNSW, UNSW Sydney
• Department: Anatomy
• Course: ANAT2111
• Professor: Dr Lawrence Wade

Document Summary

Apex posterior and medial walls parallel. Medial wall: maxilla + lacrimal + ethmoid (thin and weak) Floor: maxilla + palatine most posterior, thin. Orbital fissure separate the > and < wings of sphenoid. Lateral wall: sphenoid + zygomatic (thick and strong) Attach to the margins of orbital rim. Thickened to form the tarsal plates (dense fibrous tissue). Levator palpebrae superioris inserts onto the eyelid functions to open the eyelid. Action of recti not straight, hence oblique muscles to enable straight up and down movements. All muscles except mr and lr have more than one function. Oblique muscles help gaze forward instead of outwards. Posterior pole optic nerve becomes synonymous with inner layer. Aqueous humor constantly being produced and being reabsorbed into the venous blood stream. Lobule - most posterior - fibrous tissue and fat. Soundwave reaches the ear closer to the sound slightly earlier than the other ear. When the sound reaches the second ear, it is less intense.