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.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is ["Radial flexion of the wrist"]
Explanation
Radial flexion of the wrist, also known as radial deviation, refers to the movement of the wrist towards the radial (thumb) side of the forearm.
This movement is achieved by the contraction of muscles on the lateral (thumb) side of the forearm.
The joint involved in radial flexion of the wrist is the radiocarpal joint, which is a condyloid joint formed by the articulation between the distal end of the radius bone and the carpal bones of the wrist.
This joint allows for a range of movements, including:
1. Ulnar flexion of the wrist: This refers to the movement of the wrist towards the ulnar (little finger) side of the forearm, which is achieved by the contraction of muscles on the medial (little finger) side of the forearm.
2. Extension of the wrist: This refers to the movement of the wrist backward, away from the palm of the hand.
This movement is achieved by the contraction of muscles on the back of the forearm.
3. Flexion of the wrist: This refers to the movement of the wrist forwards, towards the palm of the hand.
This movement is achieved by the contraction of muscles on the front of the forearm.
4. Adduction of the wrist: This refers to the movement of the wrist towards the midline of the body, which is achieved by the contraction of muscles on the medial (little finger) side of the forearm.
5. Abduction of the wrist: This refers to the movement of the wrist away from the midline of the body, towards the radial (thumb) side of the forearm, which is achieved by the contraction of muscles on the lateral (thumb) side of the forearm.
All of these movements of the radiocarpal joint are important for fine motor skills, such as writing, typing, and playing musical instruments, as well as for everyday activities such as lifting and carrying objects.
Correct Answer is ["epiphyseal analysis"]
Explanation
The epiphysis is the rounded end of the femur that articulates with the hip bone and knee joint.
As a child grows, the epiphysis gradually fuses with the rest of the bone through a process called ossification.
By examining the degree of fusion of the epiphysis with the femur on an X-ray, doctors can estimate the age of the child.
In general, the younger the child, the less fused the epiphysis will be, and the easier it will be to determine the child's age.
However, it's important to note that this method provides only an approximate age range and cannot be used to determine an exact age.
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