Articulations. Articulation. Joint between bones. Does not mean movement! Some joints are immovable; sutures.
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1 Articulations Joint between bones Articulation Does not mean movement Some joints are immovable; sutures.
2 Classification of joints Two questions about joints: 1- How does it move? - functional 2- How is it held together?- structure I) Functional definition " 1)synarthrosis" Immovable joint; sutures 2)amphiarthrosis" Partially movable; fibula and tibia (syndesmosis). 3)diarthrosis Freely moveable; knee, shoulder, fingers. II) Structural definition Structure of the joint; how the joint is held together. 1)fibrous" Lots of collagen fibers, usually dense CT; limited or no movement. a) sutures" Skull- fibers anchors bone. Fontanels- large areas of CT between fetal cranial bones. Synostoses Synostoses; Sometimes sutures fuse No joint present- only bone.
3 b) syndesmoses" More fibrous CT, longer fibers Similar to ligaments Slight degree of motion; amphiarthrotic. Tibiofibular joint. c) gomphoses Very dense CT layer Between the alveoli of alveolar processes and teeth. Synarthrotic. 2) Cartilaginous a)synchondrosis" Cartilage within the joint Temporary cartilaginous joint During the growth phase. Immovable joint; epiphyseal plate. b)symphysis Cartilaginous pad; between the two pubic bones.
4 3) synovial Complex structure, diarthrotic. Joint cavity filled with synovial fluid. Structure A) articular capsule" Surrounds the joint and cavity. Consists of... a) outer fibrous" capsule Irregular dense CT, very fibrous; collagenous. External sheath; holds joint together. b) inner synovial membrane Lines the inside of the fibrous capsule Boundary of the synovial cavity. Produces synovial fluid.
5 B) joint cavity" Synovial fluid Fluid filled; between the bones of the joint." Free movement; protection of joint. Fluid secreted by synovial membrane." Lubricating, nutrient rich material." Protects and maintains hyaline cartilage of the epiphyses C) accessory ligaments" Additional mechanical support to the joint. a) extracapsular ligaments" Located outside of the joint capsule. b) intracapsular ligaments Help stabilize the joint internally.
6 D) articular discs" Discs of fibrocartilage" Shape the internal surface of joint" Better fit between the bones. intra-articular discs or menisci" Within the knee joint E) bursae Fluid filled sacs, cushion underneath ligament and tendons." Where the joint might experience extra stress or pressure.
7 Factors that allow some movement 1) apposition of parts" 2) fit of structures" 3) strength and tension of ligaments" Soft structures limit how much a joint can move. How bones fit together; defines the range of motion. determines range of motion. 4) arrangement and tension of muscles determines range of motion." Also help stabilize the joint. 1) gliding Movements Bone slides over the surface of another. No change in angle.
8 2) angular Motion defined by a change in angle a) flexion/extension b) abduction* c) adduction* d) rotation Decrease in angle, flexion; increase, extension. Limb is moved away from the midline. Limb is moved towards the midline. Rotates around a axis e) circumduction Complex series of motions combined into a single smooth motion" Pitcher winds up to pitch a ball. 16
9 3) special" a) inversion/eversion" The foot; inversion- sole of the foot faces midline." Eversion- sole of the foot faces laterally b) dorsiflexion/plantarflexion" c) protraction/retraction" d) supination/pronation" Foot; dorsiflexion- flexing the foot towards the shin." Plantarflexion- extending the foot towards the floor. Structure is pushed out- protraction, or pulled in- retraction Turning the palm to face anteriorly, supination." Turning the palm to face posteriorly, pronation. e) elevation/depression Raising or lowering a structure, respectively. Types of joints Types of movement a joint can produce 1) gliding- arthrodial" 2) hinge-ginglymus" 3) pivot-trochoid " Rotation 4) ellipsoid- condyloid" Flexion/extension and abduction/adduction 5) saddle- sellaris" Flexion/extension Flexion/extension and abduction/adduction 6) ball & socket- spheroid Flexion/extension, abduction/adduction and rotation
10 Planes of movement Joint movement creates planes of movement Nonaxial" No angular change; gliding, arthrodial joint Monaxial" Change along one axis; flexion/extension; ginglymus joint Biaxial" Two axes; flexion/extension and abduction/adduction; condyloid and sellaris joints Triaxial Three axes; flexion/extension, abduction/adduction and rotation; spherical joint.
11 Tibiofemoral joint Knee joint 3 joints" Largest and most complex in the body intermediate patellofemoral" lateral tibiofemoral" Between patella and femur. Between lateral condyle of femur and tibia. medial tibiofemoral Between medial condyle of femur and tibia. articular capsule Capsule of the knee is not complete. Does not entirely surround the structures of the knee. extracapsular ligaments" Knee ligaments; external support. patellar ligament" Anterior surface of the knee; inferior margin of patella to tibial tuberosity. tibial collateral ligament*" Medial surface of the knee; medial epicondyle of femur to the medial side of tibial head. fibular collateral ligament Lateral surface of the knee; lateral epicondyle of the femur to the lateral side of fibular head.
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13 Intracapsular Within the knee capsule Anterior cruciate*" Anterior side of the joint cavity." Prevents the femur from sliding posteriorly Posterior cruciate Posterior side of the joint cavity. " Prevents the femur from sliding anteriorly articular discs" Cartilaginous pads within the capsule; stabilize the fit of the bones. medial meniscus*" On the medial condyle of tibia; fits with the medial femoral condyle. lateral meniscus" On top of the lateral condyle of tibia; fits with the lateral femoral condyle. *involved in injuries by lateral blow to the knee
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