TMJ and Joints - JC

Question 1

3 general joint classifications

Answer 1

synarthrosisamphiarthrosisdiarthrosis

Question 2

synarthrosis example

Answer 2

sutures, gomphosis (PDL)

Question 3

amphiarthrosis example

Answer 3

vertebral disks

Question 4

6 diarthrosis classifications

Answer 4

arthrodial - plane glidinggingylmus - hinge, elbowtrochoid - pivot, dens axis/atlascondyloid - 2 planes, occipital/atlasentarthrodial - ball and socket, handsellar - saddle, metacarpal

Question 5

TMJ joint classification

Answer 5

gingylmoarthrodial - hing in inferior, sliding in superior

Question 6

articular disk in TMJ

Answer 6

superior gliding and inferior hinge. biconcave with center of fibrocartilage and posterior is elastic fibers

Question 7

ligaments of TMJ

Answer 7

lateral temporalmandibular sphenomandibular stylomandibular

Question 8

TMJ innervation from mandibular trigeminal

Answer 8

auriculotemporal - most of jointmasseteric - small anterior portion through mandib notchdeep temporal - small anterior portionall sensory

Question 9

TMJ blood supply

Answer 9

superficial temporal artery via external carotid maxillary artery via external carotid

Question 10

lateral deviation of jaw, how?

Answer 10

opposite lateral pterygoid of motion contracts moving jaw

Question 11

muscles in protrusion

Answer 11

lateral pterygoid

Question 12

muscles of retrusion

Answer 12

temporalis, deep masseter

Question 13

muscles of elevation

Answer 13

masseter, medial pterygoid, temporalis (responsible for tonis which is resting position)

Question 14

muscles of depression

Answer 14

lateral pterygoid, suprahyoid muscles, infrahyoid muscles