Terminology of Movement in Human Anatomy

Terminology of Movement

Introduction

Understanding anatomical movement terminology is essential for accurately describing the actions of muscles and joints in the human body. These terms are always referenced relative to the anatomical position, which is the standard position of the body used in anatomy to avoid confusion.

Term	Definition
Flexion	Decreasing the angle between two body parts; typically refers to bending a joint, such as bending the elbow or knee.
Extension	Increasing the angle between two body parts; straightening a joint, such as straightening the elbow or knee.
Dorsiflexion	Movement at the ankle where the toes are brought closer to the shin (upward movement of the foot).
Plantarflexion	Movement at the ankle that increases the angle between the shin and the top of the foot (pointing the toes downward).
Abduction	Movement of a limb away from the midline of the body, such as raising the arms or legs to the side.
Adduction	Movement of a limb toward the midline of the body, such as lowering the arms or legs back to the side.
Rotation	Movement of a bone around its longitudinal axis, such as turning the head from side to side.
Circumduction	Circular movement that combines flexion, extension, abduction, and adduction, such as moving the arm in a circle at the shoulder.
Pronation	Rotation of the forearm so the palm faces downward or posteriorly.
Supination	Rotation of the forearm so the palm faces upward or anteriorly.
Elevation	Upward movement of a body part, such as shrugging the shoulders.
Depression	Downward movement of a body part, such as lowering the shoulders after a shrug.
Excursion	Side-to-side movement of the mandible (jaw) during chewing.
Opposition	Movement of the thumb to touch the tips of the other fingers on the same hand.
Reposition	Movement of the thumb and fingers back to the anatomical position from opposition.
Inversion	Turning the sole of the foot inward toward the midline of the body.
Eversion	Turning the sole of the foot outward, away from the midline of the body.
Protraction	Anterior movement of a body part in the transverse plane, such as moving the jaw forward.
Retraction	Posterior movement of a body part in the transverse plane, such as pulling the jaw backward.

Key Points

• Anatomical position is the reference point for all movement terminology.

• Movements are often paired as opposites (e.g., flexion vs. extension, abduction vs. adduction).

• Understanding these terms is crucial for describing joint actions, muscle functions, and for clinical communication.

Examples and Applications

• Flexion and Extension: Bending and straightening the elbow during a biceps curl.

• Abduction and Adduction: Moving the arms away from and toward the body during jumping jacks.

• Pronation and Supination: Rotating the forearm to turn the palm down (pronation) or up (supination).

• Opposition: Touching the thumb to the tip of the little finger, a movement unique to humans and some primates.

Additional info: Excursion is sometimes further classified as lateral and medial excursion, referring to movement away from or toward the midline, respectively.