types of freely moveable joints

11 terms by erickgreen35

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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

condyloid

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

saddle

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

pivot

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

hinge

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

gliding

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

articulation

or joint is where two bones come together

synarthroses

are moveable joints, singular form is synarthrosis

amphiarthroses

slightly moveable joints, singular form amphiarthrosis

diarthroses

freely moveable joints, singular form diarthrosis

functions of the skeletal system

support, protection, movement

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