MEDRADSC 2RA3 Lecture Notes - Lecture 11: Paranasal Sinuses, Ethmoid Sinus, Lacrimal Groove

• School: McMaster University
• Department: Medical Radiation Sciences
• Course: MEDRADSC 2RA3
• Professor: Alana Trainor

Document Summary

Frontal sinus is most anterior: same settings. Antrum of highmore is another name for the maxillary sinus. The superior level of the maxillary sinus is also the floor of the orbit. The eyes are superior to the maxillary sinus: same settings. Ethmoid sinuses are all the curly sinuses running midline: same settings. The orbits of the eyes: same settings. Orbital plate of the frontal bone & most of the lesser wing of the sphenoid make up the roof of the orbit. Anterolateral aspect, the lacrimal fossa/gland sits in it. Medial wall: orbital plate of the ethmoid, frontal process of the maxilla, lacrimal bone, body of the sphenoid. Lacrimal groove of the lacrimal sac is on the lacrimal bone; makes up medial wall of the orbit. Shape of orbit is not spherical like the eye; it is conical in shape. Have openings at the apex for optic canal/foramen (perfectly round hole for the optic nerve)