Presentation Transcript
Skeletal Systems :Skeletal Systems
Skeletal Systems :Skeletal Systems Skeletal systems provide…
Support
Protection
Movement
All bones connect by joints the joints are…
Ball and socket
Pivot
Saddle
Hinge
Ellipsoid
Plane
Joints :Joints There are three types of joints
Immovable
Partially movable
synovial
Immovable – edges that tightly interlock
Partially movable – allow some flexibility
Synovial – most movable joints
Hinge Joints :Hinge Joints A hinge joint allows extension and retraction of an appendage.
Ball and Socket Joints :Ball and Socket Joints A ball and socket joint allows for radial movement in almost any direction. They are found in the hips and shoulders.
Saddle Joints :Saddle Joints A saddle joint allows movement back and forth and up and down, but does not allow for rotation like a ball and socket joint.
Ellipsoid Joints :Ellipsoid Joints Ellipsoid joints are similar to a ball and socket joint. They allow the same type of movement to a lesser magnitude. The wrist is an ellipsoid joint.
Pivot Joints :Pivot Joints Pivot joints allow rotation around an axis. The neck and forearms have pivot joints. In the neck the occipital bone spins over the top of the axis. In the forearms the radius and ulna twist around each other.
Gliding Joints & Plane Joints :Gliding Joints & Plane Joints In a gliding or plane joint bones slide past each other. Metacarpal and metatarsal joints are gliding joints