Joints. Occur where two bones meet Allow various ranges of motion? Are they found in only the appendicular skeleton?

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Presentation transcript:

Joints

Occur where two bones meet Allow various ranges of motion? Are they found in only the appendicular skeleton?

Two ways to classify joints Range of motion –Synarthrosis, amphiarthrosis, diarthrosis Composition of the joint –Boney, fibrous, cartilaginous, synovial

Synarthrosis (immovable) Would these be strong joints? Examples? –Sutures (skull bones) –Gomphoses (teeth) –Synchondroses (epiphyseal cartilages) –Synostosis (epiphyseal lines of mature long bones)

Fibrous articulations Synarthrotic Amphiarthrotic

Amphiarthroses (slightly movable) Would these be strong? Joint is formed with collagen fibers or cartilage Examples: –Syndesmosis (ligaments) –Symphyses (separated by fibrocartilage; pubic symphysis, vertebral discs)

Diarthroses (freely movable) Are these joints strong? What is the key function? All diarthrotic joints are synovial joints Examples? –Knee –Shoulder –Hip

Parts of articulations

Synovial joints Plane; slight movement Pivot; slight rotational movement in 1 direction Hinge; movement in 1 direction

Synovial joints Saddle; major movement in 1 direction; slight in another Ball & Socket; movement in multiple axes Condyloid; 2 or more axes

Synovial joints have lots of structures Bursa: Connective tissue pads Meniscus: Fibrocartilage pads Synovial fluid: proteoglycan-rich fluid for: 1.Lubrication 2.Shock absorption 3.Nutrient delivery

Compare shoulder & hip

Shoulder joint Most mobile joint Weakest joint Small ligaments hold shoulder together Small, thin muscles stabilize humerus Shallow joint capsule

Hip joint Very Stable Acetabulum swallows head of femur Multiple ligaments wrap entire joint capsule Massive muscles stabilize position

Knee joint: complex

Knee joint

Elbow joint Most stable: interlocking bones; single joint capsule; strong, wrapping ligaments

Joint Disorders Arthritis –Rheumatoid arthritis: Affects connective tissues; most pronounced & crippling in joints of hands & feet –Autoimmune disease (body attacks itself) –CT cells of synovial membrane proliferate, grow into articular cartilage of bones; bones eventually fuse

Joint Disorders Arthritis –Osteoarthritis: Natural degeneration with age and lack of exercise –Gout: Accumulation and storage of crystals of uric acid (waste) in kidney & joints Most often affects base of big toe & other leg & foot joints

Joint Disorders Sprains: pulled or torn joint stabilizing ligaments –Results when bones of joints are pulled forcefully apart Dislocation: the end of one bone is pulled OUT of socket. –Occurs in ball & socket, ellipsoid or pivot joints Cartilage injuries: “Hammering” on articular cartilage squashes and kills chondrocytes

Joint Disorders Bursitis: Inflammation of bursa –Inflammation of bursae around shoulder and elbow is common Caused by muscle instability or underdevelopment –Bursitis at base of big toe = Bunion Often caused by wearing shoes too tight

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