Chapter 5 Temporomandibular Joint
The joint disc is both _____ (having no nervous tissues) and _____ (having no blood vessels) in its thinner middle or force-bearing intermediate bone
Aneural Avascular
The _______ ______ consists of a rounded protuberance on the inferior aspect of the zygomatic process
Articular eminence
This fossa consists of an oval shaped depression on the temporal bone
Articular fossa
An area where the bones are joined to each other
Articulation
The TMJ has its sensory innervation by the ________ and _______ branches of the mandibular nerve (or 3rd division) of the 5th cranial or trigeminal nerve
Auriculotemporal and masseteric
The articulating area on the temporal bone of the joint is located on the bone's _____ aspect, involving the _____ part
Inferior Squamous
The joint disc completely divides the TMJ into two compartments or ____ _____
Synovial Fluid
A cleat viscous liquid, rather like egg white
Synovial fluid
The fibrous joint disc is located between the ... and .... on each side
Temporal bone and mandibular condyle
With aging or trauma to the joint disc area, it can become _____ or even _____
Thinner Perforated
How many paired ligaments are associated with the TMJ?
Three
The temporomandibular, stylomandibular, and sphenomandibular ligaments
Three paired ligaments with the TMJ
True or False: Most symptoms of TMD seem to originate from the muscles supporting the joint
True
There are ____ and ____ synovial cavities
Upper and lower
Protrusion of the mandible
bringing forward of the lower jaw
A fibrous ____ ____ completely encloses the TMJ
joint capsule
lateral deviation of the mandible
shifting of the lower jaw to one side
subluxation
Acute episode in which both joints become disclosed
Ligament
Band of fibrous tissue and connecting bones
Retraction of the mandible
Bringing backward of lower jaw
The blood supply to the joint is from branches of the external ______ artery, predominantly the superficial temporal branch
Carotid
The temporal bone is a _____ bone that articulates with the _____ bone of the mandible at the TMJ by way of the _____
Cranial Facial Joint disc
temporomandibular disorder (TMJ)
Disorder involving one or both temporomandibular joints
This articulating area includes the temporal bone's articular _____ and articular _____
Eminence Fossa
The mandible is a _____ bone that articulates with the _____ bone of the cranium
Facial Temporal
True or False: The testing position of the TMJ is with the teeth biting together?
False
Both articulating bony surfaces of the joint are covered by ______
Fibrocartilage
Denotes a joint having the form of both ginglymus and arthrodia joints, or hinge and sliding joints
Ginglymoarthrodial Joint
The TMJ is classified as a ____ joint
Ginglymoarthroid Joint
Two basic types of movement performed by the TMJ joint and its associates muscles: ____ (or sliding) and _____ (or hinge) movements
Gliding and rotational
The joint disc is attached to the ___ and ____ poles of the mandibular condyle
Lateral and medial
Lateral deviation is also called
Lateral excursion
The mandible is joined to the cranium by _____ of the TMJ
Ligaments
depression of mandible
Lowering of lower jaw
The articular fossa is also known as the
Mandibular Fossa or Glenoid Fossa
The TMJ is a joint on each side of the head that allows for movement of the mandible for ____, _____, and _____
Mastication, speech, and respirations
A fibrous joint disc is also called
Meniscus
Also the Sphenomandibular Ligament is not part of the TMJ, it becomes accentuated and taut when the mandible is ____
Protruded
elevation of mandible
Raising of lower jaw
Trismus
Reduced opening of the jaws
This ligament is not strictly considered part of the TMJ but is located on the medial side of the mandible, at some distance from the joint
Sphenomandibular Joint
This ligament is a vestige of Meckel cartilage, which is part of the embryonic lower jaw
Sphenomandibular Ligament
The temporomandibular Ligament is considered the major ligament for the joint since it provides the _____ to the joint
Strength
A variable ligament formed from thickened cervical fascia in the area
Stylomandibular ligament
This ligament runs from the styloid process of the temporal bone to the angle of the mandible
Stylomandibular ligament
The lymph from the TMJ is drained deeply into the.....
Superior deep cervical nodes
venous return
The _____ _____ is by the superficial temporal, maxillary, and pterygoid plexus of veins
joint
site of a junction or union between two or more bones