Pivot (trochoid) joints are uniaxial joints that permit rotation, such as the atlas-axis joint. Which option names this joint type?

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Multiple Choice

Pivot (trochoid) joints are uniaxial joints that permit rotation, such as the atlas-axis joint. Which option names this joint type?

Explanation:
Rotation around a single axis defines a pivot (trochoid) joint. The atlas sits atop the dens of the axis and can rotate around that peg, turning the head from side to side. This uniaxial rotation is the hallmark of a pivot joint, distinguishing it from other joints that move in more than one plane or primarily by bending in a single plane. The other joint types describe different motion patterns: hinges move mainly by flexion and extension in one plane; saddles and condyloids allow movement in two planes but not rotation around a single central axis. So the name that fits this joint type is pivot (trochoid) joint.

Rotation around a single axis defines a pivot (trochoid) joint. The atlas sits atop the dens of the axis and can rotate around that peg, turning the head from side to side. This uniaxial rotation is the hallmark of a pivot joint, distinguishing it from other joints that move in more than one plane or primarily by bending in a single plane. The other joint types describe different motion patterns: hinges move mainly by flexion and extension in one plane; saddles and condyloids allow movement in two planes but not rotation around a single central axis. So the name that fits this joint type is pivot (trochoid) joint.

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