BM 1041:03 Lecture 4: joints

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Ch 9 Wiley
Define and describe the structure of the 3 main classes of joints: fibrous, cartilaginous,
synovial
Fibrous
No synovial cavity
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Bones held together by dense irregular connective tissue rich in collagen fibres
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cartilaginous
No synovial cavity
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Bones held together by cartilage
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Synovial
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Bones connected by dense irregular connective tissue of an articular capsule and accessory ligaments
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Describe fibrous joints (synarthroses: suture, gomphosis and syndesmosis) and
cartilaginous joints (amphiarthroses: synchondroses, symphyses)
Functional classifications
Synarthrosis
immovable
-
Amphiarthrosis
Slightly movable
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Diarthrosis
Freely movable
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Synovial joints
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Fibrous - synarthroses
3 types
Suture
Between bones of skull
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Made up of thin layer of dense irregular connective tissue
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Very short interconnecting fibres, bone edges interlock
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e.g. skull bone
Syndesmoses
Joint held together by ligament
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Greater distance between articulating surfaces and more dense irregular connective tissue than suture
-
L2 - joints and movement
Saturday, 3 March 2018
11:26 AM
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Gomphosis
Peg in socket
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Binds teeth to bony teeth sockets
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Periodental ligament holds tooth in socket
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Cartilaginous - amphiarthroses
Synchondrose
s
Bones united by hyaline cartilage
-
immovable
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e.g. epiphyseal growth plate connecting epiphysis and diaphysis of growing bone
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Symphyses
Bones united by fibrocartilage
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Ends of articulating bones covered with hyaline cartilage, but broad, flat disc of fibrocartilage connects the
bones
-
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bones
Determine the role of the structural characteristics of synovial joints: including cavity,
synovial fluid, synovial membrane, fibrous capsule, as necessary for stability, mobility
and protection
Joint cavity
Fluid containing cavity
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Synovial fluid
Consists of hyaluronic acid secreted by synovial cells in membrane and interstitial fluid filtered from
blood plasma
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Provides thin film over surfaces within capsule
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Reduces friction (lubrication)
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Absorbs shock
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Supplies oxygen and nutrients to and removes carbon dioxide and metabolic waste from chondrocytes
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Contains phagocytic cells that remove microbes and debris
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Mainly a filtrate of blood that comes from articular cartilage
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Synovial
membrane
Secretes synovial fluid
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Fibrous capsule
Often reinforced by ligaments
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Articular cartilage
Covers articulating surfaces of bones, reducing friction during movement
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Absorbs shocks
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Smooth and strong
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STABILISE
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Bursa
Fibrous sac lined by synovial membrane containing synovial fluid
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Tendon sheaths
Wrap around certain tendons
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lubrication
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Document Summary

Define and describe the structure of the 3 main classes of joints: fibrous, cartilaginous, synovial. Bones held together by dense irregular connective tissue rich in collagen fibres cartilaginous no synovial cavity. Bones connected by dense irregular connective tissue of an articular capsule and accessory ligaments. Describe fibrous joints (synarthroses: suture, gomphosis and syndesmosis) and cartilaginous joints (amphiarthroses: synchondroses, symphyses) Made up of thin layer of dense irregular connective tissue. Very short interconnecting fibres, bone edges interlock e. g. skull bone. Greater distance between articulating surfaces and more dense irregular connective tissue than suture. Bones united by hyaline cartilage immovable e. g. epiphyseal growth plate connecting epiphysis and diaphysis of growing bone. Ends of articulating bones covered with hyaline cartilage, but broad, flat disc of fibrocartilage connects the bones. Determine the role of the structural characteristics of synovial joints: including cavity, synovial fluid, synovial membrane, fibrous capsule, as necessary for stability, mobility and protection.

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