Joint Classifications

Question 1

Name the different types of Fibrous Joints (Synarthroses).

Answer 1

Suture, Syndesmosis, Gomphosis

Question 2

Explain Fibrous Joints.

Answer 2

Joints composed of bone that are united by fibrous tissue and are non-synovial. Movement is minimal-to-none with the amount of movement permitted at the joint dependent on the length of the fibers uniting the bones.

Question 3

Suture Joint

Answer 3

Union of 2 bones by a ligament or membrane.
Immovable Joint
Eventual fusion is termed synostosis
Sagittal suture of the skull is an example

Question 4

Syndesmosis Joint

Answer 4

Bone connected to bone by a dense fibrous membrane or cord.
Very little motion.
Tibia and Fibula with interosseous membrane is an example.

Question 5

Gomphosis Joint

Answer 5

Two bony surfaces connect as a peg in a hole.
Teeth and corresponding sockets in the mandible are the only gomphosis joints in the body.
The periodontal membrane is the fibrous component of the joint.

Question 6

List the types of Cartilaginous Joints.

Answer 6

Synchondrosis, Symphysis

Question 7

Explain Cartilaginous Joints.

Answer 7

These joints have a hyaline cartilage or fibrocartilage that connects one bone to another.
These are slightly movable joints.

Question 8

Synchondrosis Joints

Answer 8

Cartilage adjoins two ossifying centers of bone.
Hyaline Cartilage.
Provides stability during growth.
May ossify to a synostosis once growth is completed slight motion.
Sternum & True rib articulations are examples.

Question 9

Symphysis Joints

Answer 9

Generally located at the midline of the body.
Two bones covered with hyaline cartilage.
Two boned connected by fibrocartilage.
Slight motion.
Pubic Symphysis is an example.

Question 10

List the types of Cartilaginous Joints (Amphiarthroses).

Answer 10

Synchondrosis, Symphysis

Question 11

List the Synovial Joints(Diarthroses).

Answer 11

Uniaxial, Biaxial, & Mutli-axial Joints.

Question 12

Explain Synovial Joints.

Answer 12

Joints that provide free movement between the bones they join.
5 unique characterists.
Most complex joints & vulnerable to injury.
Further classified by the type of movement and shape of the articulating bones.

Question 13

List the 5 unique characterists of Synovial Joints.

Answer 13

Joint cavity, capsule, articular cartilage, synovial membrane, synovial fluid, and fibrous capsule.

Question 14

Uniaxial Joints

Answer 14

One motion around a single axis in one plane of the body.
Hinge Joints- elbow joint
Pivot Joints- Atlantoaxial Joint

Question 15

Biaxial Joints

Answer 15

Movement occurs in two planes and around two axes through the concave/convex surfaces.
Condyloid- Metacarpophalangeal Joints of a finger
Saddle- Carpometacarpal Joint of the thumb

Question 16

Multi-axial Joints

Answer 16

Movement occurs in three planes and around three axes.
Plane (gliding)- carpal Joints
Ball and Socket- Hip & Glenohumeral Joint