| flexion |
This movement takes place about a transverse axis and is a description of the movement that occurs when you lift your arm forward. It is described as the approximation (moving closer together) of two ventral surfaces of the body eg flexing the elbow joint, but there are a number of situations where this rule doesn't seem to apply eg at the ankle where the terms dorsi and plantar flexion are used to avoid confusion.
출처: www.sohp.soton.ac.uk/biosci/anatomy3.htm
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