tmj Flashcards
apex
crest of eminence
slope
articular eminence
articular eminence
- LOAD bearing
- outer fibrous layer
- inner fibrocartilage
postglenoid process
- NOT load bearing
- outer and inner fibrous layer that resembles periosteum
- continues with retrodiscal pad
load bearing areas vs non load bearing
load bearing has thick fibrous layers
articular disc
- biconcave
- superior: gliding (translational movement)
- inferior: hinge (rotation *1st movement)
- dense regular ct with thick collagen fiber bundles
- avascular and no nerves
bilamina zone
retrodiscal pad
retrodiscal pad
-highly vascularized and innervated
superior lamina of retrodiscal pad
from pars posterior of disc to squamotympanic fissue
-ct: collagen, elastic, nerves and vessels
inferior lamina of retrodiscal pad
- from pars posterior of disc to condyle
- collagen (NO elastic)
genu vasculosum
- space between superior and inferior lamina
- contains arteriovenous shunt
condyle
- synovial joint
- NOT made of hyaline cartilage
- NO diaphysis or epiphysis
outer layer of condyle
-fibrous
inner layer of condyle
- fibrocartilage
- 3 zones: proliferative, hypertrophic, calcification
head of the condyle is made by
from secondary cartilage by endochondral ossification
thick pars anterior
attached to superior head of lat pterygoid m
thin pars intermedia
load bearing area
-NO nerves or vessels
thick pars posterior
attached to retrodiscal pad
what indicates multidirectional growth capacity of condyle
unordered cartilagenous cell columns
fibrocartilage is _____ (more or less) mineralized than subarticular bone
more
layers of synovial fluid
superficial cellular intimal layer
inner vascular subintimal layer
type a cells of intimal layer
macrophage-like
type b cells of intimal layer
fibroblast-like
many rer, make synovial fluid
composition of synovial fluid
hyaluronic acid, lubricin, monocytes
synovial membrane only covers
non load bearing areas of articular disc
articular disc has
organized thick collagen fibers and sparse fibroblasts
