Articular eminence (most convex part of fossa: "high position") and Articular fossa are the two articulating areas. They are located on the inferior aspect of the bone. .
b. Post-gleniod process: bone on the distal area of the zygomatic arch.
Front of rounded depression: Articular eminence.
Depression: Articular Fossa.
Back of rounded depression: Post-glenoid process.
2. MANDIBLE .
a. Articulating surface of condyle is coronal part .
b. Anterior to the condyle is the coronoid process. .
c. The Mandibular notch is the area in between the coronoid process and the condyle.
THE JOINT CAPSULE:.
a. Completely encloses the TMJ; wraps around the articular eminence and articular fossa superiorly, and wraps around the mandibular condyle (including the neck) inferiorly.
b. Tough, fibrous CT.
c. Nerve supply and rich blood supply: a lot of pain possible.
THE DISC .
a. Fibrous, located between the temporal bone and condyle of the mandible on each side.
b. Divides the TMJ into two spaces- synovial cavities.
1. Upper synovial cavity.
2. Lower synovial cavity.
c. Membranes line the inside of capsule and secrete synovial fluid for lubrication.
JAW MOVEMENTS:.
TMJ is classed ginglymoarthrodial joint because it moves as a hinge while its rotating. GLIDES and ROTATES.
Sliding of Jaw: correct name is translation.
Protrusion: bringing lower jaw forwards.
Retraction: bringing lower jaw backwards.
Depression: lowering of lower jaw.
Elevation: raising of lower jaw.
Contracting Muscle Action.
Lateral pterygoid ►UNILATERAL contraction: lateral excursion; as one side contracts, the other side flops out.
►BILATERAL contraction: pulls mandible forward (protrusion) also, sliding or translation.
Temporalis muscles (posterior portion) .
Retraction of mandible.
Anterior suprahyoid .
&.
Lateral pterygoid muscle (infer. heads).
Also involved .
BILATERAL contraction: depression of mandible (opening jaw).
Masseter.
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- The humerus is a long bone, the occipital is a flat bone, and the vertebrae is an irregular bone. ... Describe the structure and function of this type of bone. - The cavity of the vertebral body mainly consists of cancellous bone (spongy bone) tissue surrounded by a outer protective layer of compact bone. ... Spongy bone most of the time has red bone marrow where blood cells are produced. ... What type of bone makes up the majority of the diaphysis of long bones like the humerus? ... The bone during this process is remodeled to match the bone before the break. ...
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