Introduction to Joints and Their Classifications

Notes

Chapter 9 JOINTS Joints / Articulations Point of contact between bones, teeth and bone, or cartilage and bone Function: • Allow movement • Provide stability • Bear weight • Allow long bones to lengthen • Link the skeletal system • Strong joints • Mobile joints Joint Classifications Functional: Degree of Motion Allowed 1. Synarthrosis- No mobility; stability 2. Amphiarthrosis- Slightly mobile; stability 3. Diarthrosis- Freely mobile; not much stability Structural: Anatomical Features 1. Bony 2. Fibrous 3. Cartilaginous 4. Synovial 1. Bony Joints • Synostosis= bony joint • Synarthrosis: immovable • Two bone ossified together to form one bone • Start as fibrous or cartilaginous joints Examples: • Frontal bone • Mandible • Hip bones • Epiphyses with diaphysis • First rib to sternum (in old age) 2. Fibrous Joints • Fastened by Dense Regular CT • Fiber: • Synarthrosis or amphiarthrosis • No joint cavity Types: 1. Suture 2. Gomphosis 3. Syndesmosis: longer fibers collagen fibers short fibers 2. Fibrous Joints Sutures • Only bind bones of the skull • Immobile or slightly mobile 2. Fibrous Joints Gomphoses Tooth attachment to alveolus (socket) of mandible and maxillae • Periodontal ligament...