Ch. 9 - Articulations

What is the relationship between mobility and stability?

more mobile --> less stable

less mobile --> more stable

Flexion

movement that decreases a joint angle (bends a joint)

Extension

movement that increases a joint angle (straightens a joint)

Hyperextension

further extension beyond the zero position

Lateral Flexion

trunk moves in coronal plane (cervical and lumbar regions)

Abduction

lateral movement of the body part away from the body's midline

Adduction

movement of the body part back toward the body's midline

Radial deviation

tilt hand toward thumb (wrist abduction)

Ulnar deviation

tilt hand toward little finger (wrist adduction)

Pronation

medial rotation of the forearm, so palm faces posterior or inferior

Supination

lateral rotation of the forearm, so palm faces anterior or superior

External rotation

outward or lateral movement of humerus or femur

Internal roation

inward or medial movement of humerus or femur

Circumduction

circular motion

Opposition

thumb movement toward palmar tips or fingers

Reposition

opposite movement - away from palm

Elevation

superior movement of a body part

Depression

inferior movement of a body part

Protraction

anterior movement of a body part in the transverse plane

Retraction

posterior movement of a body part in the transverse plane

Dorsiflexion

movement of the ankle that bring the toes toward the leg

Plantar flexion

movement of the ankle that points the toes inferiorly

Inversion

movement of ankle that brings sole of food medially (inward)

Eversion

movement of the ankle that bring sole of foot laterally (outward)