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Multiple Choice
Which of the following examples represents a bony joint, or synostosis?
A
Fusion of the two frontal bones into a single bone in the adult skull
B
The sutures between cranial bones in a child
C
The pubic symphysis
D
The shoulder joint
Verified step by step guidance
1
Understand the definition of a bony joint (synostosis): A bony joint, or synostosis, occurs when two bones fuse together to form a single bone. This type of joint is immovable and typically forms during development or as a result of aging.
Analyze the first option: 'Fusion of the two frontal bones into a single bone in the adult skull.' This represents a bony joint because the two frontal bones fuse into one during development, forming a single immovable structure.
Analyze the second option: 'The sutures between cranial bones in a child.' Sutures are fibrous joints, not bony joints, as they allow slight movement during development and do not involve the fusion of bones into one.
Analyze the third option: 'The pubic symphysis.' The pubic symphysis is a cartilaginous joint, not a bony joint, as it consists of fibrocartilage and allows limited movement.
Analyze the fourth option: 'The shoulder joint.' The shoulder joint is a synovial joint, which is highly movable and does not involve the fusion of bones. Therefore, it is not a bony joint.