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Abduction
Movement away from the midline of the body
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Adduction
Movement toward the midline off the body
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Articular cartilage
Hyaline cartilage attached to articular bone surfaces
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Articulation
The action or manner in which the parts come together at a joint
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Ball-and-socket joint
An articulation (as the hip joint) in which the rounded head of one bone fits into a cuplike cavity of the other and admits movement in any direction
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Cartilage
A usually translucent somewhat elastic tissue that composes most of the skeleton of vertebrate embryos and except for a small number of structures (as some joints, respiratory passages, and the external ear) is replaced by bone during ossification in the higher vertebrates.
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Circumduction
A movement at a synovial joint in which the distal end of the bone moves in a circle while the proximal end remains relatively stable
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Dorsiflexion
Bending the foot in the direction of the dorsum (upper surface)
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Extension
An unbending movement around a joint in a limb (as the knee or elbow) that increases the angle between the bones of the limb at the joint
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Flexion
A bending movement around a joint in a limb (as the knee or elbow) that decreases the angle between the bones of the limb at the joint
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Goniometer
An instrument for measuring angles (as of a joint or the skull)
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Hinge joint
Joint between bones (as at the elbow or knee) that permits motion in only one plane
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Hyaline cartilage
Translucent bluish white cartilage consisting of cells embedded in an apparently homogeneous matrix, present in joints and respiratory passages, and forming most of the fetal skeleton
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Joint
The point of contact between elements of an animal skeleton whether movable or rigidly fixed together with the surrounding and supporting parts (as membranes, tendons, or ligaments)
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Ligament
Dense regular connective tissue that attaches bone to bone
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Plantar flexion
Bending the foot in the direction of the plantar surface (sole)
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Rotation
Moving a bone around its own axis, with no other movement
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Synovial cavity
The space between the articulating bones of a synovial joint, filled with synovial fluid. Also called a joint cavity.
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Synovial fluid
Secretion of synovial membranes that lubricates joints and nourishes articular cartilage
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Synovial joint
A fully moveable joint in which the synovial (joint) cavity is present between the two articulating bones
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Tendon
A white fibrous cord of dense regular connective tissue that attaches muscle to bone
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Actin
A contractile protein that is part of the thin filaments in muscle fibers
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Carpal tunnel syndrome
A condition caused by compression of the median nerve in the carpal tunnel and characterized especially by weakness, pain, and disturbances of sensation in the hand and fingers
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Endomysium
The delicate connective tissue surrounding the individual muscular fibers within the smallest bundles
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Epimysium
The external connective-tissue sheath of a muscle
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Fascicle
A small bundle or cluster, especially of nerve or muscle fibers
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Insertion
The attachment of a muscle tendon to a moveable bone or the end opposite the origin
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Myosin
The contractile protein that makes up the thick filaments of muscle fibers
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Origin
The attachment of a muscle tendon to a stationary bone or the end opposite the insertion
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Perimysium
The connective-tissue sheath that surrounds a muscle and forms sheaths for the bundles of muscle fibers
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Sarcomere
Any of the repeating structural units of striated muscle fibrils
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Sliding filament mechanism
The explanation of how thick and thin filaments slide relative to one another during striated muscle contraction to decrease sarcomere length
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Tropomyosin
A protein of muscle that forms a complex with troponin regulating the interaction of actin and myosin in muscular contraction
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Troponin
A protein of muscle that together with tropomyosin forms a regulatory protein complex controlling the interaction of actin and myosin and that when combined with calcium ions permits muscular contraction
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