A joint, or an articulation, is a place where two bones come together. A joint is usually considered movable, but that is not always the case. Many joints exhibit limited movement, and others are completely, or almost completely, immovable
- Weakest parts of the skeleton
- Articulation – site where two or more bones meet
- Give the skeleton mobility
- Hold the skeleton together
1.2 Structural and Functional Classification
- By function – degree of movement
- By structure – presence of cavity
- 1.2.1 Classification of Joints: Structural
- • Structural classification focuses on the material binding bones together and whether or not a joint cavity is present.
- • The three structural classifications are:
- 1.2.2 Classification of Joints: Functional
- • Functional classification is based on the amount of movement allowed by the joint.
- • The three functional class of joints are:
- Synarthroses – immovable
- Amphiarthroses – slightly movable
- Diarthroses – freely movable
18.104.22.168 Fibrous Joints or Fixed Joints
- The bones are jointed by fibrous tissues
Eg. joint are the sutures of the skull.
- There is no joint cavity.
- Most are immovable.
- There are three types –
Figure 1- Fibrous Joint
Table 1- Types of Fibrous Joints
Figure 2- (a) Sutures (b) Syndesmoses (c) Gomphoses