09_LectureOutline

09_LectureOutline - An Introduction to Articulations...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
An Introduction to Articulations Articulations Body movement occurs at joints (articulations) where two bones connect Joint Structure Determines direction and distance of movement ( range of motion ) Joint strength decreases as mobility increases Classification of Joints Two methods of classification Functional classification is based on range of motion of the joint Structural classification relies on the anatomical organization of the joint Functional Classifications Synarthrosis ( immovable joint ) No movement Fibrous or cartilaginous connections May fuse over time Amphiarthrosis ( slightly movable joint ) Little movement Fibrous or cartilaginous connections Diarthrosis ( freely movable joint ) More movement Also called synovial joints Subdivided by type of motion Structural Classifications Bony Fibrous Cartilaginous Synovial Functional Classifications Synarthroses (immovable joints) Are very strong Edges of bones may touch or interlock
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Four types of synarthrotic joints: suture gomphosis synchondrosis synostosis Synarthrotic Joints Suture Bones interlocked Are bound by dense fibrous connective tissue Are found only in skull Gomphosis Fibrous connection ( periodontal ligament ) Binds teeth to sockets Synchondrosis Is a rigid cartilaginous bridge between two bones: epiphyseal cartilage of long bones between vertebrosternal ribs and sternum Synostosis Fused bones, immovable: metopic suture of skull epiphyseal lines of long bones Functional Classifications Amphiarthroses More movable than synarthrosis Stronger than freely movable joint Two types of amphiarthroses syndesmosis : » bones connected by ligaments symphysis : » bones separated by fibrous cartilage Synovial joints (diarthroses) Also called movable joints At ends of long bones Within articular capsules Lined with synovial membrane Synovial Joints Components of Synovial Joints Articular cartilages Pad articulating surfaces within articular capsules : prevent bones from touching Smooth surfaces lubricated by synovial fluid : reduce friction
Background image of page 2
Synovial fluid Contains slippery proteoglycans secreted by fibroblasts Functions of synovial fluid: lubrication nutrient distribution shock absorption Accessory structures Cartilages: cushion the joint: » Fibrous cartilage pad called a meniscus ( articular disc ) Fat pads: superficial to the joint capsule protect articular cartilages Ligaments: support, strengthen joints sprain : ligaments with torn collagen fibers Accessory structures Tendons: attach to muscles around joint help support joint Bursae: pockets of synovial fluid cushion areas where tendons or ligaments rub
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 11

09_LectureOutline - An Introduction to Articulations...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online