do fibrous joints permit a lot of movement?
no, they generally permit very little movement
what are exmples of fibrous joints?
- sutures in the skull
- tooth socket - gomphosis
- syndesmosis - immovable connective tissue holding bones together (ex. the tibia and fibula)
do cartilagenous joints permit a lot of movement?
no, they generally permit very little movement (like fibrous joints)
what are examples of cartilagenous joints?
- primary cartilagenous joints
- secondary cartilagenous joints
what are primary cartilagenous joints?
- bone and cartilage in direct apposition
- ex. sternocostal junction
what are secondary cartilagenous joints?
- fibrous tissue internally in the joint
___ joints consist of a capsule filled with fluid contained in a membrane
- *synovial fluid in a synovial membrane
movement of bones relative to one another, facilitated by muscle, take place in ___ capsules in ___ joints
- articular capsule (fibrous capsule + synovial membrane)
how are types of synovial joints classified?
based on how many axes they can move along and also by the shapes of their articular surfaces
the TMJ is a ___ joint
the TMJ articulation is composed of the ___ of the mandible and the ___ of the skull, which is indented on the underside of the ___ bone
- glenoid fossa
what types of movements does the TMJ need to produce?
protrusive, extrusive, and retrusive movements
the ___ provides a track that the condyle slides along. theis is bounded anteriorly by the ___, which the condyle moves in front of when the jaw opens
- glenoid fossa
- articular eminence
the condyle is able to ___ and ___ in various ways
rotate and translate
is the articular disk a distinct structure?
no, it is an extension of the synovial capsule
the synovial cavity is divided into two compartments. describe this.
- the compartments are divided by the articular disk
- upper joint cavity - adjacent to the glenoid fossa
- lower joint cavity - adjacent to the condyle
the articular disk runs between and attaches the ___ and ___, enveloping the joint
condyle and glenoid fossa
the mandible is formed by ___ ossification
the mandible is associated with ___ cartilage
meckel's cartilage forms the ___ directly and articulates with the ___. this forms a primitive, or primary joint, before the deveopment of the ___ and ___.
- tempral bone
the articulation between the temporal bone and the condyle forms the ___
TMJ - this is the secondary joint
the articular surfaces of the TMJ are covered with a ___, as opposed to ___
- fibrous connective tissue
- hyaline cartilage
what is the fibrous covering of the condyle called?
what is the lamina splendens?
- fibrous covering of the condyle that is a layer of mostly avascular type I collagen with some fibroblasts scattered around
the glenoid fossa is covered by a ___ layer attached directly to the ___, while the articular eminence is overalid by a ___ layer
- thin fibrous
- temporal bone
- much thicker fibrous
is there cartilage associated with the articular surfaces of the joint proper?
no - it is fibrous connective tissue
where is cartilage found?
deeper into the condyle and the articular eminence
the layers of cartilage found deep in the condyle and the articular eminence have a layer of progenitor cells which spawn ___ in a proliferative layer, which in turn secrete ECM containing type ___ collagen around themselves
cartilage has what type of collagen?
the joint capsule forms the ___ that the joint is located within
dense collagenous sac