What type of joint is present within the thumb?
Hinge.
Condylar.
Saddle.
Ball and Socket.
The Correct Answer is C
The thumb has three joints: the carpometacarpal (CMC) joint, the metacarpophalangeal (MP) joint, and the interphalangeal (IP) joint.
The CMC joint is a saddle type of joint that allows the thumb to move in multiple directions. A saddle joint has two concave surfaces that fit together like a rider on a horse.
Choice A is incorrect because hinge joints allow only flexion and extension movements, such as the IP joints of the thumb.
Choice B is incorrect because condylar joints have an oval-shaped surface that articulates with a shallow cavity, such as the MP joint of the thumb.
Choice D is incorrect because ball and socket joints have a spherical head that fits into a cup-like socket, such as the shoulder or hip joints.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is ["Occipital bone"]
Explanation
The occipital bone is a flat, unpaired bone located at the posterior aspect of the skull, forming the lower part of the back of the head.
It features several surface landmarks, including the external occipital protuberance, which serves as an attachment site for muscles and ligaments.
The occipital bone also contains several foramina, including the foramen magnum, which allows the spinal cord to pass through and connect to the brain.
The occipital bone is an important site for the attachment of muscles involved in head movement and posture.
Correct Answer is ["Tibia"]
Explanation
The tibia, also known as the shinbone, is the larger of the two bones in the lower leg.
It is a long bone that extends from the knee joint to the ankle joint, and it plays an important role in supporting body weight and providing attachment sites for muscles.
The tibia has a triangular cross-section and features several surface landmarks, including the tibial plateau, the medial malleolus, and the tibial tuberosity.
The bone is also involved in the formation of the knee joint and the ankle joint, where it articulates with the femur and the talus bones, respectively.
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