Ch 9 Joints- Articulations -between bones, cartilage and bones, or teeth and bones.

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Presentation transcript:

Ch 9 Joints- Articulations -between bones, cartilage and bones, or teeth and bones

Functional Classification 1. Immovable / 2. Slightly movable / 3. Freely movable /

Structural Classification 1. Fibrous – many collagenous fibers Examples: a. - ligament can be twisted, amphiarthrotic ex: distal ends of tibia & fibula b. - between flat bones, synarthrotic ex: skull c. - cone-shaped bony process meets bony socket, synarthrotic ex: root of tooth

Structural Classification 2. Cartilaginous- cartilage connects Examples: a. - hyaline or costal cartilage ex: b/w 1 st ribs & sternum epiphyseal disk – no movement after age 25 (synarthrotic) b. - broad flat disk of fibrocartilage, amphiarthrotic ex: pubic symphysis, intervertebral disks

3. Synovial- allow free movements*most joints fit this classification Examples: a. movement in all planesex: hip, shoulder b. - condyle of one bone fits into cavity of another ex: metacarpals into phalanges c. - back and forth motion, nearly flat ex: wrist and ankle d. - convex surface of one bone fits into the concave surface of another ex: elbow and knee e. -ex: head side to side, between radius and ulna f. - between bones that fit together ex: carpals and metacarpals

Accessory Structures Ligaments- Tendons- Bursae- Bursitis Bunion Menisci- Fat pads -

Preventing injury = limiting range of motion/stabilizing joint Factors responsible for limiting ROM: If movement occurs beyond ROM = damage ligaments with some torn collagen fibers Ligament as a whole survives and joint is not damaged Articulating surfaces forced out of position Damages articular cartilage, ligaments, joint capsule : partial dislocation

9-3 Joint Movement Refer to chart from outline

Intervertebral Discs Separate vertebrae, pads of fibrocartilage Not found nucleus pulposus distort the annulus fibrosus, forcing it into vertebral canal nucleus pulposus breaks through the annulus fibrosus, distorts/compresses sensory nerves

Parts of a synovial joint 1. Articular Cartilage- 2. Joint capsule- 3. Joint cavity- 4. Ligaments-

MCL-medial LCL- lateral

Aging A pain and stiffness of skeletal and muscular systems Several major forms All forms of rheumatism that damage articular cartilages of synovial joints Damage results from: Infection, Injury to joint, Metabolic problems, Severe physical stresses Osteoarthritis Caused by: wear & tear of joint surfaces Genetic factors affecting collagen formation Generally affects people 60 or older Rheumatoid arthritis Inflammatory condition Caused by: Infection Allergy Autoimmune disease: body attacks own tissues Gouty arthritisBuildup of uric acid crystals in synovial fluid interferes w/ joint movement Caused by: Gout Calcification of joints in people over 85