Identify the incorrect pair.
Select one:
a. synarthrosis; immovable joint
b. amphiarthrosis, slightly movable joint
c. chondrosis; freely moving joint
d. gomphosis; articulation between tooth and bone
e. They are all correct; there is no incorrect pair.
The Correct Answer and Explanation is :
The incorrect pair is:
c. chondrosis; freely moving joint
Explanation:
- Synarthrosis (immovable joint):
- This pair is correct. Synarthrosis refers to joints that allow little to no movement. These are immovable joints, and they are often found in areas where stability is needed, such as in the sutures of the skull.
- Amphiarthrosis (slightly movable joint):
- This pair is also correct. Amphiarthroses allow for limited movement between bones. Examples include the joints between the vertebrae in the spine and the pubic symphysis. These joints provide both stability and limited flexibility.
- Chondrosis (freely moving joint):
- This is the incorrect pair. Chondrosis refers to the degeneration of cartilage and is not a term used to describe a type of joint. The term you’re likely thinking of is diarthrosis, which refers to a freely moving joint, such as the knee, elbow, or shoulder. Diarthroses are synovial joints, which are characterized by a joint cavity and allow a wide range of movement.
- Gomphosis (articulation between tooth and bone):
- This pair is correct. Gomphosis is a type of fibrous joint where a peg-like structure (such as a tooth) fits into a socket, like the articulation between a tooth and its socket in the jawbone. This is a fixed joint, and its main function is stability.
- All correct (no incorrect pair):
- Since option “c” is incorrect, this answer is not applicable.
To summarize, chondrosis is not associated with freely moving joints, and the correct term should be diarthrosis for joints that allow extensive movement. Chondrosis refers to cartilage degeneration, which is a pathological process rather than a joint classification.