articulations and body movement; microscopic anatomy &skeletal muscle
Terms
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- articulations
- joints; perform 2 functions hold bones together and allow skeleton some flexibility
- amphiarthroses
- slightly moveable joints
- synarthroses
- immovable joints
- diarthroses
- freely movable joints
- fibrous joints
- bone joined by fibrous tissue generally little or no movement(amphiarthroses & synarthroses
- 2 major types of fibrous joints + 1
-
syndesmoses and sutures +
gomphosis(tooth in bony socke tby periodontal ligament) - sutures
- irregular bone interlock and are united by very short connective tissue fibers
- syndesmoses
- articulating bones connected by short ligaments distal end of tibia and fibula
- cartilaginous joints
- articulating bone ends are connected by a plate or pad of cartilage
- symphyses
-
bones connected by a broad, flat disc of fibrocartilage
(intervertebral joints and pubic symphysis) - 2 major types of cartilaginous joints
- symphyses(growing together) and synchondroses
- synchondroses
- bony portions connected by hyaline cartilage (articulation of costal cartilage of first rib w/sternum and epiphseal plate of growing children
- synovial joints
- articulating bone ends are separated by a joint cavity containing synovial fluid; all synovial joints are diarthroses
- skeletal muscle
- bulk of body's muscle
- skeletal muscle a.k.a.
- voluntary and striated muscle
- fibers
- long dylindrical cells
- sarcolemma
- cell membrane of a muscle fiber(cell)
- myofibril
- threadlike structure, extending longitudinally through a muscle fiber
- myofilaments
- small threadlike structures mainly actin myosin
- sarcomeres
- actual contractile units of muscle