Download Muscle Movements, Names and Types

Muscle Movements, Names
and Types
Ch 6 Anatomy and Physiology
5 Golden Rules of Skeletal Muscles
Body Movements
• All muscles attach to something at no
fewer than 2 points
– Origin is the less moveable attachment
– Insertion attached to the moveable bone
• Upon contraction insertion moves toward
the origin
– Tends to cause body movement
Types of Body Movements
1. Flexion
•
•
Usually in the sagittal plane
Angle of joint decreased, bone closer
Body Movements
1. Extension
•
•
•
Opposite of flexion
Increase the angle,
bones apart
Over 180° is called
hyperextension
•
Can be normal like in
the neck
Movements Con’t.
3. Rotation
•
Movement
around the long
axis
•
•
Ball and socket
joints
Atlas and axis in
shaking head “no”
Movements
4. Abduction
•
Movement away
from the midline
(frontal plane)
5. Adduction
•
Opposite of
abduction
6. Circumduction
•
Cone shaped
movement of ball and
socket joint
Special Movements of the Foot
• Dorsiflexion is lifting
the toes
• Plantar flexion is
pointing the toes
• Inversion is turning
the sole medially
• Eversion turns the
sole laterally
– Ankle sprains
Special Movements of the Forearm
• Supination
– Palms anterior
– Anatomical position
– Radius and Ulna
parallel
• Pronation
– Palm rotates
posteriorly
– Radius across ulna
Special Movement of the Thumb
• Opposition
– Opposable thumb
helps humans grasp
• Touch fingertips with
the thumb
• Due to the saddle
joint between the 1st
Metacarpal and
Carpal bones