Question

No relative movement occurs at a synarthrosis, whereas slight movement occurs at an amphiarthrosis.

Option 1:
A. Synarthrosis exhibits no movement; amphiarthrosis has slight movement.

Option 2:
B. Amphiarthrosis involves slight movement, while synarthrosis lacks movement.

Option 3:
C. No movement occurs at synarthrosis; amphiarthrosis shows slight movement.

Option 4:
D. Synarthrosis lacks movement; amphiarthrosis experiences slight movement.

Answer 1

A synarthrosis joint is immobile and offers stability and protection, such as skull sutures, while an amphiarthrosis joint permits slight movement, as in the pubic symphysis.

Step-by-step explanation:

The functional classification of joints is based on the degree of movement they allow. A synarthrosis is a type of joint that is immobile or nearly immobile and therefore, does not permit any movement. An important function of these joints is providing stability and protection for vital organs, as seen with the skull sutures protecting the brain. In contrast, an amphiarthrosis allows for slight movement between the bones it connects. An example of an amphiarthrosis would be the pubic symphysis, which unites the left and right hip bones with a strong, yet slightly mobile, cartilaginous joint. When comparing synarthrosis and amphiarthrosis, the primary difference lies in their permitted movement: synarthroses do not allow movement, whereas amphiarthroses allow limited movement.