Synovial Joints
an educational video presentation

The Joints

Crash Course A & P Channel provides a fun fast paced discussion on synovial joints and all joints.  Particularly the significance of synovial joints within the human body.  Joints are the meeting place between two or more bones.

There are actually more  joints in the body than bones and the greatest number of joints are synovial joints.  The primary function of joints is to allow for movement, this enables us to interact with the world around us.  Movement happens when muscles that cross a joint contract, moving one bone toward another.

All of the skeletal muscles attach to bone or connective tissue at least two points.  The muscles origin attaches to the less movable of the two bones.  The muscles insertion attaches to the movable bone.  When a muscle contracts it moves the movable insertion toward the origin attached to the less movable bone. 

Joints can be classified functionally as synarthrotic, amphiarthrotic or diarthrotic based on the  amount of movement that can take place at the joint.  Synarthrotic joints have very little to no movement like the sutures.  Amphiarthrotic joinsts are slightly moveable like the joints between the vertebra called intervertebral joints.  Diarthrotic joints are commonly referred to as freely movable and have the greatest range of motion.

Joints can also be classified by their structure and the tissues that they are made from.  There are three classifications based on structure they are fibrous joints, cartilaginous joints and synovial joints.   The sutures are an example of fibrous joints which again are synarthrotic.  Intervertebral joints are an example of cartilaginous joints and are amphiarthotic.  The glenohumeral joint is an example of a synovial ball and socket joint which is referred to as diarthrotic. 


Muscles Provide for Action at the Synovial Joints
A break down of joints and actions as discussed in the video

Hinge Joints
Flexion/Extension

Pivot Joints
Supination/Pronation or Rotation

Gliding Joints
Movement in Multiple Planes and Axes

Chondyloid Joints
Flexion/Extension

Abduction/Adduction

Saddle Joints
Opposition

Ball and Socket Joints
Flexion/Extension

Abduction/Adduction

Medial Rotation/Lateral Rotation

Horizontal Flexion/Horizontal Extension
Circumduction


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References and Resources

YouTube Published on May 26, 2015

We continue our look at your bones and skeletal system, skipping over the silly kid's song in favor of a more detailed look at your your axial and appendicular skeleton. This episode also talks about the structural and functional classifications of your joints and the major types of body movement that they facilitate.

Table of Contents
Basic Structure of Your Skeletal System 1:50
Axial and the Appendicular Skeleton 2:02
Structural and Functional Classifications of Joints 3:41
Major Types of Body Movement 6:02

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