Which of the following best defines a joint (articulation)?
A cavity within a bone
A point where two bones fuse permanently
A site where two or more bones meet
The connection between muscle and bone
The Correct Answer is C
A. A cavity within a bone: A cavity within a bone (for example the medullary cavity) is not the definition of a joint.
B. A point where two bones fuse permanently: A permanent fusion of bones is called a synostosis and is not the general definition of a joint.
C. A site where two or more bones meet: A joint (articulation) is the site where two or more bones meet and permit varying degrees of movement.
D. The connection between muscle and bone: The connection between muscle and bone is a tendon, not a joint.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. To allow spinal cord passage:The foramen magnum is the large opening at the skull base through which the brainstem continues as the spinal cord and major vessels and nerves pass.
B. To house the pituitary gland:The pituitary gland sits in the sella turcica of the sphenoid bone, not in the foramen magnum.
C. To anchor meninges:While meninges attach to cranial structures, anchoring of meninges is not the primary role of the foramen magnum.
D. To attach facial muscles:Facial muscles attach to facial bones and soft tissue rather than to the foramen magnum.
Correct Answer is C
Explanation
A. Synovial:Synovial describes a freely movable joint with a joint cavity and synovial fluid, not an immovable joint.
B. Amphiarthrosis:Amphiarthrosis refers to a joint that permits slight movement, such as the pubic symphysis.
C. Synarthrosis:Synarthrosis denotes an immovable joint where bones are tightly joined, for example cranial sutures.
D. Diarthrosis:Diarthrosis is another term for freely movable joints (synovial joints) that allow a wide range of motion.
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