Chapter 8 Joints Objectives 1 Know how joints

Chapter 8: Joints Objectives: 1) Know how joints are classified 2) Know the a)Functional Categories and b) Structural Categories Reminders: Vocab/ Stems due today HW due tomorrow Quiz Monday

Joint Classifications 1. Functional Classification (one we will learn) 2. Anatomical Classification

Anatomical Joint Classifications • this classification relies solely on the anatomical or structural organization of the joint • these anatomical categories do have some relationship with the functional categories – structure = function

Functional Classifications • Synarthrosis – no movement • Amphiarthrosis – little movement • Diarthrosis – more movement The shoulder joint is the most freely moving joint in the body.

Functional Joint Classification

4 Types of Synarthrotic Joints 1. Suture (fibrous) • • bound by dense fibrous connective tissue found only in skull

4 Types of Synarthrotic Joints 2. Gomphosis (fibrous) • • binds teeth to bony sockets (maxillary bone and mandible) fibrous connection between tooth and socket is called periodontal ligament

4 Types of Synarthrotic Joints 3. Synchondrosis (cartilaginous) • • • rigid cartilaginous bridge between 2 articulating bones epiphyseal cartilage of long bones between vertebrosternal ribs and sternum

4 Types of Synarthrotic Joints 4. Synostosis (bony fusion) • • totally rigid fused bones epiphyseal lines of mature long bones

2 Types of Amphiarthroses 1. Syndesmosis – bones connected by ligaments • between tibia and fibula 2. Symphysis – bones separated by a wedge or pad of fibrocartilage • • intervertebral discs connection between pubic bones

Diarthrosis (Synovial) Joints • freely moveable joints • typically located at the end of long bones