KIN340-Chapter2

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Chapter 2 – Basic Kinematic Concepts

Forms of Motion

Directional Terms

Planes of Sections + Axes of Rotation

Joint Movement Terminology

Forms of motion

Translation: all parts of a body travel exactly the same distance, in the same direction, in the same time.

Rectilinear translation – straight line translation

Curvilinear Translation – curved line translation

Angular (rotational) motion: – all parts of the body, move along a circular path about the same point called the axis of rotation, so that all parts travel through the same angle, in the same direction, in the same time.

General Motion: a combination of translation and rotation - most movements are difficult to classify into pure translation or rotation .

Directional Terms

Superior (cranial) – closer to the head

Inferior (caudal) – farther from the head

Anterior (ventral)– toward the front of the body

Posterior (dorsal) – toward the back of the body

Medial - closer to the mid-line

Lateral – further from the mid-line

Proximal – closer to the trunk

Distal - farther from the trunk

Palmer (volar)– palm side of hand

Plantar (volar) - sole of foot

Dorsal – back of hand / top of foot

Superficial/deep – closer to the surface/farther from the surface

Planes of Section and Axes of Rotation

Joint Movement Terminology

In the sagittal plane about the mediolateral axis.

Flexion – decreasing joint angle or anteriorly directed rotations of the head, trunk, upper arm, forearm, hand, and upper leg. Posteriorly directed movement of the lower leg

Extension – increasing joint angle (back to anatomical position) or returns a body segment to the anatomical position from flexion

Hyperextension – movement of the joint angle beyond the anatomical position in the opposite direction to flexion

Plantar flexion – top of the foot away from the tibia

Dorsiflexion – top of the foot toward the tibia

In the frontal plane about the anteroposterior axis

ABduction – movement away from the midline

ADduction – movement towards the midline

Lateral Flexion (head and trunk)

Elevation – upward movement

Depression – downward movement

Inversion – sole of the foot inward (medially)

Eversion – sole of the foot outward (laterally)

In the transverse plane about the longitudinal axis.

Rotation:

• Left / Right rotation – for head, neck, and trunk

• Medial rotation – rotation towards the midline

• Lateral rotation – rotation away from the midline

Pronation – rotation of forearm/hand towards the midline

Supination – rotation of forearm/hand away from the midline

Protraction – movement forward

Retraction – movement backward

Special case

Circumduction – distal end of limb moves in a circle while the proximal end is stable.

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