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Ch. 8 Joints


A site where two or more bones meet Joint
Weakest part of the skeleton Joints
2 Fundamental Functions of a Joint Give our skeleton mobility, & Hold our skeleton together
3 functional classifications of a Joint Synarthroses, Amphiarthroses, & Diarthroses
Immovable joints Synarthroses
Slightly movable joints (pubic symphysis, some intervertable and sternocostal joints) Amphiarthroses
freely movable joints (most joints in the appendicular skeleton) Diarthroses
4 structural classifications of a joint Bony fusion, Fibrous joints, Cartilaginous joints, Synovial joints
Fusion of 2 bones (metopic suture of the frontal bone, epiphyseal lines of mature long bones) Synostoses
Based on the material binding the bones together and whether or not a joint cavity is present Structural classifications
Characteristics of Fibrous joints Bones joined by fibrous tissue, no joint cavity present, some are amphiarthrotic but most are synarthrotic
3 types of Fibrous joints Sutures, Syndesmoses, Gomphoses
Interlocking bone edges connected by very short connective tissue fibers. Synarthrotic. Sutures
Connective tissue fibers are slightly longer than sutures. Synarthrotic or Amphiarthrotic Syndesmoses
Peg-in-socket fibrous joint of the teeth Gomphoses
Articulating bones united by cartilage, no joint activity Cartilaginous joints
2 types of Cartilaginous joints Synchondroses & Symphyses
A bar or plate of hyaline cartilage unites the bones Synchondroses
unsually synarthrotic Synchondroses
epiphyseal plates in immature individuals Synchondroses
Articular surfaces covered by hyaline cartilage Symphyses
Hyaline cartilage fused with fibrocartilage Symphyses
Amphiarthrotic Symphyses
pubic symphysis and intervertebral joints Symphyses
Ends of bones covered by glassy-smotth hyaline (articular) cartilage Synovial Joints
Has a joint (synovial) cavity Synovial Joints
Synovial cavity enclosed in a two-layer articular capsule. Outer fibrous of dense irregular. Inner synovial membrane composed of loose connective tissue Synovial Joints
Joint (synovial) cavity contains synovial fluid that acts as lubricant Synovial Joints
Surrounded by reinforcing ligaments and tendons that are well supplied with nerves to monitor stretch Synovial Joints
Created by: ky13