190lec6 Joints

190lec6 Joints - HKIN 190 Anatomy & Physiology I Joints...

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HKIN 190 Anatomy & Physiology I Joints
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Learning Objectives 1. To understand the classification of joints. 2. To understand the details of synovial joints in particular. Within this, to understand: the structure of synovial joints different types of synovial joints 3. To understand common joint injuries.
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Tissue types in the body – CMEN C onnective Tissue Blood Bone Cartilage Connective Tissue Proper M uscle Smooth Skeletal Cardiac E pithelial Squamous Cuboidal Columnar Pseudostratified Transitional N ervous
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Joints still fall within the “skeletal system”: C onnective Tissue Blood Bone Cartilage Connective Tissue Proper M uscle Smooth Skeletal Cardiac E pithelial Squamous Cuboidal Columnar Pseudostratified Transitional N ervous • The skeletal system is comprised of bone and its associated connective tissue.
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Learning Objective 1 To understand the classifications of joints.
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What are joints? Also known as: Articulations Arthroses (singular = arthrosis) They are parts of the skeleton that join: 1. Bone to bone 2. Bone to cartilage 3. Bone to tooth MOST joints allow for movement, but SOME DO NOT .
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Joints are commonly classified by either: 1. Function (do they allow for movement, or only to hold to bones together) or 3. Structure (their component parts; in particular – do they have a synovial cavity and what type of CT helps bind them) How are joints classified?
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Classification based on function depends on 1 characteristic: 1. How much movement do they allow? Based on this criteria, there are 3 classifications of joints: 1. Synarthrosis/es : NO movement; Examples? 2. Amphiarthrosis/es : Slight movement; Examples? 3. Diarthrosis/es : Free moving ; all are synovial; Examples? Classification of joints based on function :
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Classification based on structure depends on 2 characteristics: 1. Is there are space between the 2 articulating joint surfaces? (This would be called a “synovial cavity”). 2. What type of connective tissue (connective tissue proper or cartilage) holds the bones together? Classification of joints based on structure :
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Based on these criteria, we have 3 structural classifications of joints: 1. Fibrous joints NO synovial cavity Joints held together by DICTP (lots of collagen fibres) Examples? 2. Cartilaginous joints NO synovial cavity Joints held together by cartilage (hyaline or fibrocartilage) Examples? 3. Synovial joints HAS synovial cavity Joints held together by DICTP that makes up a “ joint capsule ”, plus often there are accessory ligaments helping keep the joint stable. Examples? Classification of joints based on structure : 3 types 2 types 6 types Note: DICTP = dense irregular connective tissue proper
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1. Fibrous joints (3 types) 1. Suture 2. Syndesmosis/es 3.
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190lec6 Joints - HKIN 190 Anatomy & Physiology I Joints...

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