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- Site where two or more bones meet
- Joint is the weakest part of the skeleton
Funtions of the Joints (2)
- Gives movement
- Holds the bones together
How many bones does and embryo have and how many bones does an adult (over 25) have?
Longest and shorest bones
- Longest is the femur (thigh)
- Shortest is the stapes (inner ear)
Two classifications of Joints
Functional and Structural
Three Fibrous Structural Joints
Joints in which the articulating bones are seperated by a fluid-containing joint cavity
Based on the about of movement allowed by joint
Three functional classes of joints
- Joint is there but no movement
- Ex. Skull joint
- Slightly movable
- Ex. wrist, ankle
- Freely movable, can move all the way around
- Ex. shoulders
- Focuses on the material bidning bones together and whether or not a joint cavity is present
- Structure between bone material
Three structural classifications
- Three types:
Synchondroses and symphyses
Diathroses- completly moveable joint
- A fibrous structure that occurs between the bones of the skull
- Interlocking junctions completely filled with connective tissue fibers, NO HOLES
- Binds bones tightly together but allows room for growth during youth
When skull bones fuse at middle age
- Bones are connected by a fibrous tissue ligament
- Partial movement
- Ex. the connection between the tibia and fibula and the radius and ulna (for hand)
- The beg-in-socket fibrous joint between a tooth and its alveloar socket.
- The fibrous connection is the periodontal ligament
- A cartilaginous joint where a bar/plate of hyaline cartilage that unites the bones, tightly packed around.
- Ex. epiphyseal plates of children and joint between the costal cartialge of the first rib and the sternum
- A cartilaginous joint.
- Hyaline cartilage covers the articulating sureface of the bone and is fused to an interventing pad of fibrocartilage.
- Ex. intervertral joints and the pubic symphysis of the pelvis
- Those joints in which the articulating bones are separated by a fluid-containing joint cavity
- freely moveable (Diarthroses)
- Ex. all libs joints and most joints of the body
Synovial Joints all have the following (5)
- Articular cartilage
- Joint cavity
- Articular capsule
- Synovial Fluid
- Reinforcing ligaments
- Ball baring joint to reduce friction
- Flattened, fibrous sacs lined with synovial membrane containing synovial fluid
Enlongated bursa that wraps comletely around the tendon
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