An Introduction to Joints PDF
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This document provides an introduction to joints, discussing how they function and the trade-off between strength and mobility. It further classifies joints based on structural and functional considerations, highlighting different types like synarthroses, amphiarthroses, and diarthroses. The document covers specific examples of each type, such as sutures, gomphoses, and synchondroses.
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An Introduction to Joints Joints (articulations) – Where two bones meet – Where body movement occurs A tradeoff exists between strength and mobility 1 © 2018 Pearson Education, Inc. 9-1 Classification...
An Introduction to Joints Joints (articulations) – Where two bones meet – Where body movement occurs A tradeoff exists between strength and mobility 1 © 2018 Pearson Education, Inc. 9-1 Classification of Joints Two classification schemes – Structural (anatomy) – Functional (range of motion) Joint structure determines function 2 © 2018 Pearson Education, Inc. 9-1 Classification of Joints Structural classifications – Fibrous – Cartilaginous – Bony – Synovial Functional classifications – Synarthrosis (immovable joint) – Amphiarthrosis (slightly movable joint) – Diarthrosis (freely movable joint) 3 © 2018 Pearson Education, Inc. 9-1 Classification of Joints Synarthrosis (immovable joint) – Very strong – Edges of bones may touch or interlock – May be fibrous or cartilaginous – Four types of synarthrotic joints Suture Gomphosis Synchondrosis Synostosis 4 © 2018 Pearson Education, Inc. 9-1 Classification of Joints Synarthrosis – Suture Found only between bones of skull Edges of bones interlock Bound by dense fibrous connective tissue – Gomphosis Binds teeth to bony sockets Fibrous connection (periodontal ligament) 5 © 2018 Pearson Education, Inc. 9-1 Classification of Joints Synarthrosis – Synchondrosis Rigid cartilaginous bridge between two bones Found between vertebrosternal ribs and sternum Also, epiphyseal cartilage of growing long bones – Synostosis Created when two bones fuse Example: metopic suture of frontal bone And epiphyseal lines of mature long bones 6 © 2018 Pearson Education, Inc. 9-1 Classification of Joints Amphiarthrosis – More movable than a synarthrosis – Stronger than a diarthrosis – May be fibrous or cartilaginous – Two types of amphiarthroses Syndesmosis—bones connected by a ligament Symphysis—bones connected by fibrocartilage 7 © 2018 Pearson Education, Inc.
