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shape of joint surfaces range of movement examples

ball and socket

ball shaped end of one bone fits into cup-shaped socket of another permits widest range of movement in all planes, including rotation ex. sholulder,hip


oval-shaped condyle fits into elliptical cavity of another angular motion but not rotation occipital condyles with atlas; metacarpals and metatarsals with phalanges


articulating surfaces of both bones have concave and convex regions; shapes of two bones complement each other permits wide range of movement carpometacarpal joint of thumb is only saddle joint in body


rounded or conical surface of one bone fits into ring of bone or tendon rotation joint between atlas and axis; proximal radioulnar joint


convex protection of one bone fits into concave depression in another permits flexion and extension only elbow and knee joints


flat or slightly curved surfaces moving against each other sliding on twisting without circular movement between carpals in wrist and between tarsals in ankle


or joint is where two bones come together


are moveable joints, singular form is synarthrosis


slightly moveable joints, singular form amphiarthrosis


freely moveable joints, singular form diarthrosis

functions of the skeletal system

support, protection, movement

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