MST1350 #6 Types of Diarthrodial/Synovial (freely movable) Joints

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ALL 6 movable joints fall under the classification of Functional/Action - but what is the name of this type of freely movable joint?

Diarthrodial - a/k/a Synovial

Explain what a Diarthrodial joint is -

Diathrodial joints are synovial joints, freely moving with a joint cavity between the articulation

There are 6 types of Diarthrodial joints - name them

1) Ball & socket
2) Ellipsoid/Condyloid
3) Hinge
4) Saddle
5) Gliding/Plane
6) Pivot

What does a ball and socket joint look like, and how does it move?

It has a ball-shaped head that articulates with a dish-shaped depresson allowing movement in every plane.

A joint that allows movement in every plane is called

multiaxial

Give an example of a ball & socket joint

hip or shoulder

Give an example of a multiaxial joint

Hip or shoulder - allows movement in every plane -

What does an Ellipsoid/Condyloid joint look like, and how does it move?

Oval shaped end of one bone articulates with an elliptical basin.
It is a biaxial joint which allow movement in 2 directions.
1) flexion/extension 2) adduction/abduction

Give an example of a biaxial joint

wrist, trapezium, 1st metacarpal bones

Give an example of an Ellipsoid/Condyloid joint

wrist joint

What does a hinge joint look like?

A hinge joint can only flex and extend - one direction of movement. One direction of movement is called Uniaxial.

A joint that can only move in one direction is called

Uniaxial

An example of a hinge joint is

elbow

An example of a uniaxial joint is

elbow

Describe what a "saddle joint" looks like.

A saddle joint is a concave (inward curved bone) and a convex (outward curved bone) articulate. It is a biaxial joint - it allows movement in 2 directions.

A joint that can move in only 2 directions is called?

Biaxial joint

An example of a biaxial joint is

trapezium bone and the first metacarpal bone

What does a Gliding/Plane joint look like?

Gliding/Plane joints look like 2 bones that have flat (or almost flat) surfaces so at the point where they articulate - the movement would be gliding. This is a non-axial joint and the movement is very minimal.

What movements does a Gliding/Plane joint make?

Gliding/plane joints make minimal movements. It is a non-axial joint.

What type of joint is a Gliding/Plane joint?

non-axial joint - minimal movement

What is an example of a Gliding/Plane joint?

spine, carpals and tarsals

What type of joint is a ball and socket joint?

multiaxial - allows movement in a number of axises

What type of joint is an ellipsoid/condyloid joint?

Biaxial - allows movement in 2 axises

What type of joint is a hinge joint?

uniaxial - allows movement around 1 axis only

What type of joint is a saddle joint?

biaxial - allows movement in 2 axises

What type of joint is a pivot joint?

uniaxial - allows movement around 1 axis

Describe what a pivot joint looks like

A pivot joint is where one bone rotates around another. Pivot joints are uniaxial - they move in 1 direction

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