Lines
Mental point to EAM.
What is the mentomeatal line (MML)?
Channels sound waves into the EAM.
What is the auricle or pinna?
Superior attachment of the auricle to the scalp.
What is the top of the ear attachment?
What is the occipital bone?
What is synarthrodial?
Glabella to EAM.
What is the glabellomeatal line (GML)?
A small cartilaginous lip-like structure located anterior to the EAM.
What is the tragus?
Palpable point at angle of mandible.
What is the gonion?
extends down from the mastoid portion. Contains mastoid air cells of the mastoid sinus.
What is the mastoid process?
Suture seen only on lateral. Formed by temporal bone and each parietal.
What is the squamosal suture?
Outer canthus to EAM. AKA Radiographic Base line
What is the orbitomeatal line (OML)?
These tubes are 4 inches long and help equalize pressure in the middle ear.
What are the eustachian tubes?
Depression at the bridge of the nose.
What is nasion?
Bones that are the widest portion of the skull.
What are the parietal bones?
Small, irregular-shaped, isolated bones that develop in the adult in the lambdoidal sutures.
What are sutural and wormian bones?
Infraorbital margin to EAM.
What is the infraorbitomeatal line (IOML) or Reid's base line?
The 3 auditory ossicles.
What are the malleus, incus, and stapes?
Line between midportion of orbits or between outer canthi of eyes.
What is interpupillary line (IPL)?
suspended from the undersurface of the cribiform plate and on each side of the perpendicular plate.
What are the lateral masses or labrynths?
Most lateral of the auditory ossicles. Attached to the tympanic membrane which first picks up vibrations. Articulates with incus.
What is the malleus or hammer?
What are the orbitomeatal line (OML) and the infraorbitomeatal line (IOML)?
The part of the air cells that is the last thing that separates the brain from infection.
What is the tegmen tympani?
Point where nose and upper lip meet.
What is the acanthion?
Upper horizontal portion of the bone. Containes foramina for passage of olfactory nerves.
What is the cribiform plate?
Central portion contains oval window. Sound vibrations from ossicles travel through oval window to cochlea.
What is the vestibule?