Question

multiple choice question

which of the following is produced by embryonic bones fusing seamlessly into one adult bone?

synchondrosis
synostosis
syndesmosis
synarthrosis

Explanation:

Define the types of joint articulations

To identify the correct term, we must analyze the structural classifications of joints. A synarthrosis is an immobile joint, which is a functional category. Fibrous and cartilaginous joints can be synarthroses. Specifically, a synchondrosis is a cartilaginous joint joined by hyaline cartilage, while a syndesmosis is a fibrous joint united by ligaments or an interosseous membrane.

Analyze the process of bone fusion

Using the Bone Fusion and Joint Classification knowledge points, we look at what happens when separate bones fuse completely. When the gap between two bones ossifies, they fuse into a single, seamless adult bone. This bony joint is structurally classified as a synostosis. Examples include the fusion of the left and right frontal bones in infancy or the fusion of the epiphyseal plate into an epiphyseal line in early adulthood.

Evaluate the given options

• Synchondrosis: Cartilaginous joint, not a fused single bone.
• Synostosis: A bony joint formed by the seamless fusion of separate bones.
• Syndesmosis: Fibrous joint, not a fused single bone.
• Synarthrosis: A broad functional class (immobile joint), not the specific structural result of seamless bone fusion.

Therefore, a synostosis is the correct term.

Answer:

• Synchondrosis
• Synostosis (Correct answer)
• Syndesmosis
• Synarthrosis