Chapter 6

Mouth opening/closing occurs in which plane?

Sagittal

The TMJ is composed of which two articulating surfaces?

articular eminence and mandibular condyle

The fibrocartilagenous disc is:

biconcave

Protrusion involves motion at which "joints"?

bilateral anterior glide of the superior space

The temporomandibular joint is a:

diarthrosis

The active contribution of the lateral pterygoid in relation to the disc is that it:

eccentrically controls posterior translation of the disc during elevation

Actions of the medial pterygoid include:

elevates and contralaterally deviates

Jaw protrusion means the bottom teeth move ____________ the top teeth.

in front of

A right lateral deviation during opening involves all of the following EXCEPT:

increased glide at the left superior space

The structure that tethers the disc from moving too far anteriorly is the:

inferior retrodiscal lamina

The muscle that has attachments to the articular disc is the:

lateral pterygoid

Muscles contracting during mandibular deviation to the right include the:

left medial and lateral pterygoid

Muscles of mandibular elevation include the:

masseter and temporalis

Muscles that can cause ipsilateral deviation are the:

masseter and temporalis

An abnormal left lateral deviation during the later portion of opening (depression) could be due to:

reduced anterior glide in the left superior space

With reciprocal clicking, the first click is ______ and the second is ______.

relocating; dislocating

The arthrokinematic motion during mandibular depression is ______ in the INFERIOR space and ______ in the SUPERIOR space.

roll; glide

Forceful jaw opening would require which of the following muscles?

suprahyoids

During early opening (depression):

the majority of motion occurs at the inferior space

With a temporomandibular joint dislocation:

the mandibular condyle passes anterior to the articular eminence