Ch08 - Chapter 1 Lecture 8 The Skeletal System Articulations Introduction to Joints Joints are articulations = connections between bones Joints may

Ch08 - Chapter 1 Lecture 8 The Skeletal System...

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Chapter 1 LectureThe Skeletal System: ArticulationsChapter 8
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Introduction to JointsJointsare articulations= connections between bonesJoints may permit movementCartilage, fluid, & dense CT is usually involved in holding joints togetherOften includes ligaments & tendons
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Functional Joint Classification (Tables 8.1 & 8.2)Classified by amount of movement:Synarthroses= immovable Amphiarthroses= slightly movableDiarthroses= freely moveable jointsSynarthroses & amphiarthroses are common in axial skeletonVertebral column has many diarthrotic joints, tooDiarthroses are more common in the appendicular skeleton
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Types of SynarthrosesFibrous joints: Sutures: interlocking; short dense CT fibersGomphosis= holds tooth in alveolar fossaKnown as periodontal ligamentSynchondrosis:hyaline cartilageseparates bonese.g., epiphyseal plateSynostosis:previously separate bones are fused together to form 1 bone e.g., epiphyseal line
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Synarthroses: Fibrous
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Synarthrosis:SynchondrosisAn epiphyseal plate An epiphyseal plate is only present in a is only present in a bone that is bone that is undergoing undergoing interstitial growth interstitial growth
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Types of AmphiarthrosesSyndesmosis= fibrous jointConnected by relatively long CT fibers (ligamentous)e.g., between tibia & fibulaSymphysis= cartilaginousConnected via a fibrocartilage pade.g., pubic symphysis, intervertebral discs
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Amphiarthroses: ExamplesFibrousFibrousCartilaginousCartilaginous
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Diarthroses: Freely MovableDiarthroses are also called synovial jointsAsynovial joint consists of:Joint (articular)capsule: dense CTSynovial membrane:Lines most of joint capsuleProduces lubricating, shock absorbing, nourishing synovial fluidJoint cavity: filled with synovial fluidArticular cartilages: resemble hyaline cartilageAccessory structures may be present: e.g., menisci, fat pads, ligaments, tendons, bursaeAlso present: sensory nerves & blood vessels
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Components of Synovial Joints
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Joint Issues: Strength vs MobilityHighly mobile joints are usually less stabile.
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  • Fall '14
  • joints, elbow joint, Glenohumeral joint, knee joint

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