Rotation

Definition

Movement of a body or body part around a fixed point or axis, such that at least one point remains stationary. In arthropods, rotation describes joint articulation, limb movement in the transverse plane, and segmental twisting during locomotion or prey capture.

Etymology

From Latin 'rotatio', meaning a turning or revolving motion.

Example

In walking insects, the coxa rotates at the thoracic articulation to swing the leg forward in the recovery stroke; in raptorial mantids, the prothorax permits rapid head rotation to track moving prey.

Synonyms

• revolution
• pivotal movement

Related Terms

• abduction
• adduction
• flexion
• extension
• pronation
• supination
• Coxa
• Trochanter
• arthrodial joint
• ball-and-socket joint

Usage Notes

Distinguished from translation (linear movement without angular change). In arthropod limbs, rotation typically occurs at condylar or ball-and-socket joints; in wing kinematics, stroke plane rotation alters angle of attack. Not to be confused with 'rotation' in crop management or forestry.