Ch 8 Joints Flashcards
Site where two or more bones meet
Articulation
Functions of joints
Give skeleton mobility
Hold skeleton together
Two classifications of joints
Functional and structural
Three functional classifications
Synarthroses
Amphiarthroses
Diarthroses
Immovable joints
Synarthroses
Slightly movable joints
Amphiarthroses
Freely movable joints
Diarthroses
Three structural classifications
Fibrous
Cartilaginous
Synovial
Bones joined by dense fibrous connective tissue
No joint cavity
Most synarthrotic
3 types
Fibrous joints
Types of fibrous joints
Sutures
Syndesmoses
Gomphoses
In middle age sutures ossify and fuse
Synostoses
Rigid interlocking joints
Immovable joints for protection of brain
Contain short connective tissue fibers
Allow for growth during youth
Sutures
Bones connected by ligaments
Fiber length and movement vary
Syndesmoses
Peg in socket joints of teeth in alvelolar sockets
Gomphoses
Fibrous connection
Periodontal ligament
Bones united by cartilage
No joint cavity
Not highly movable
Two types
Cartilaginous joints
Two types of cartilaginous joints
Synchodroses
Symphyses
Bar/ plate of hyaline cartilage that unites bones
All are synarthrotic
Synchondroses
Fibrocartilage unites bone
Strong and flexible amphiarthroses
Symphyses
Bones separated by fluid filled joint cavity
All are diarthrotic
Most joints of body
Synovial joints
Six features of synovial joints
Articular cartilage/hyaline Joint cavity Articular joint capsule(2 layers) Synovial fluid Different types of reinforcing ligaments Nerves and blood vessels
What are the two layers of synovial joints
External fibrous layer
Inner synovial membrane
Thickened part of fibrous layer
Capsular
Outside the capsule
Extracapsular
Deep to capsule
Covered by synovial membrane
Intracapsular
For cushioning between fibrous layer and synovial membrane or bone
Fatty pads
Fibrocartilage separates articular surfaces to improve fit of bone ends, stabilize joint, and reduce wear and tear
Articular discs(menisci)
Sacs lined with synovial membrane
Reduce friction where ligaments, muscles, tendons, or bones rub together
Bursae
Elongated bursa wrapped completely around tendon subjected to friction
“Hot dog bun”
Tendon sheaths
Three factors of synovial joints
Shapes of articular surfaces(minor)
Ligament number and location(limited role)
Muscle tendons that cross joint(most important)