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Chptr 6 Classification of Joints
Terms in this set (23)
What is the definition of a structural joint?
A place where 2 or more bones are joined to one another by soft tissue.
What is the definition of a functional joint?
A joint that allows movement
What is the difference between a simple joint and a compound joint?
A simple joint has 2 bones, a compound joint has 3 or more bones.
What is the main function of a joint?
Joints allow movement
What is the main function of a muscle?
Muscles create movement by contracting
What is the main function of a ligament?
Ligament/joint capsules limit movement.
What is the relationship between the stability and mobility of a joint?
The more stabile a joint, the less mobile it is. The more mobile a joint is, the less stable it will be.
If a joint is more stable, then it is less what?
mobile. The price to pay for greater stability is less mobility.
How do joints absorb shock?
Kind of like a car's shock absorber - a cylinder filled with fluid. When a car hits a pothole or a bump, the fluid within the shock absorber absorbs and dampens the compression force that occurs(the shock wave that would have been transmitted to the rest of the car, as well as the people sittingwithing the car).
Where are most weight-bearing joints of the body located?
Most are in the lower extremities and the joints of the spine.
When joints are classified by structure, what are their 3 major categories?
Which structural category of joints possesses a joint cavity?
When joints are classified by function, what are their 3 major categories
Synarthrotic: very little or no movement
Amphiarthrotic: moderate limited movement
Diarthrotic: great deal of movement
Which functional category of joints allows the most movement?
Name the 3 types of fibrous joints.
Syndesmosis Joints: Bones united by a fibrous ligament or an aponeurosis. (Ex: fibrous membrane btwn the ulna and radius.
Suture Joints: Bones united by a thin layer of fibrous material. (found only in the skull)
Gomphosis Joints: Peg-in-hole - shaped bones united by fibrous material. (found only btwn teeth and the mandible, or teeth and the maxilla)
Name the 2 types of cartilaginous joints.
Symphysis Joint: fibrocartilage CT (amphiarthrotic joint) (ex: intervertebral disc joint of the spine, and pubis joint of the pelvis)
Synchondrosis Joint: hyaline cartilage (ex: costal cartilage btwn a rib and the sternum and the the grown plate of a growing bone)
Give an example in the human body of a fibrous joint, a cartilaginous joint, and a synovial joint.
Fibrous: fibrous membrane btwn the ulna and radius.
Cartilaginous: intervertebral disc of the spine
What are the components of a synovial joint?
1) Outer fibrous layer of the joint capsule
2) Inner synovial membrane layer of the joint capsule
3) Synovial cavity
4) Synovial fluid
5) Articular hyaline cartilage lining the articular ends of the bones
By motion, what are the 4 major types of synovial joints? Give an example in the human body of each type.
1) Uniaxial synovial joint
a) Hinge joint: Elbow
b) Pivot joint: atlas c1 & axis c2
2) Biaxial synovial joint
a) Condyloid: MCP Metacarpophalangeal
b) Saddle: CMC Carpometacarpal (thumb)
3) Triaxial synovial joint
a) Ball & socket: hip & shoulder joints
4) Nonaxial synovial joint
a) Gliding, irregular or plane joint: facet joint of the spine
Around how many axes does a saddle joint permit motion?
flexion & extension within the sagittal plane
abducti8on & adduction within the frontal plane
In reference to a joint, to what does the term congruency refer?
Congruency in reference to a joint means that their surfaces match each other - the surfaces of the joint "fit together." When the surfaces do not fit well "intra-articular" structures made of fibrocartilage are made to improve the fit of the 2 bones. Good Congruency helps
1) maintain normal joint movements
2) cushion the joint
Name a joint that has an intra-articular disc.
TMJ the temporomandibular joint
Draw a typical synovial joint.
THIS SET IS OFTEN IN FOLDERS WITH...
Chptr 1 Parts of the Human Body
Chptr 3 Skeletal Tissues
Chptr 12 Types of Muscle Contractions
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