Joints

• Site where two or more bones meet
• Joint is the weakest part of the skeleton

• Gives movement
• Holds the bones together

• 350
• 206

• Longest is the femur (thigh)
• Shortest is the stapes (inner ear)

Functional and Structural

• Sutures
• Syndesmoses
• Gomphoses

• Synchondroses
• Symphyses

Joints in which the articulating bones are seperated by a fluid-containing joint cavity

Based on the about of movement allowed by joint

• Synarthroses
• Amphiarthroses
• Diarthroses

• Immovable
• 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

• Fibrous
• Carilaginous
• Synovial

• Three types:
• Sutures
• Syndesmoses
• Gomphoses

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

• 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