Which of the following is not a part of the appendicular skeleton?
Clavicle.
Rib.
Femur.
Scaphoid.
The Correct Answer is B
The rib is a part of the axial skeleton, not the appendicular skeleton.
The axial skeleton
Choice A is incorrect because the clavicle is a part of the pectoral girdle, which connects the upper limbs to the axial skeleton.
Choice C is incorrect because the femur is a part of the lower limb, which is supported by the pelvic girdle.
Choice D is incorrect because the scaphoid is a part of the carpals, which are bones of the wrist in the upper limb.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is ["External rotation of the shoulder joint"]
Explanation
External shoulder rotation is the movement of the humerus bone away from the centerline of the body, rotating the arm so that the palm faces away from the body.
This movement is achieved by the contraction of the external rotator muscles of the shoulder, which include the infraspinatus, teres minor, and posterior fibers of the deltoid muscle.
The joint involved in external shoulder rotation is the glenohumeral joint, also known as the shoulder joint.
The shoulder joint is a ball-and-socket joint formed by the articulation between the head of the humerus bone and the glenoid cavity of the scapula bone.
This joint allows for a range of movements, including:
1. Internal shoulder rotation: This is the opposite movement of external rotation, in which the humerus bone rotates inward toward the centerline of the body, with the palm facing inward.
2. Shoulder flexion: This is the movement of the humerus bone forward and upward, bringing the arm closer to the body's front.
3. Shoulder extension: This is the movement of the humerus bone backward and downward, moving the arm away from the body's front.
4. Shoulder abduction: This is the movement of the humerus bone away from the body's midline, raising the arm out to the side.
5. Shoulder adduction: This is the movement of the humerus bone toward the body's midline, bringing the arm back down to the side of the body.
6. Shoulder horizontal abduction: This is the movement of the humerus bone away from the body's midline at shoulder height.
7. Shoulder horizontal adduction: This is the movement of the humerus bone toward the body's midline at shoulder height.
All of these movements of the glenohumeral joint are important for many daily activities, including reaching, throwing, pushing, pulling, and lifting.
Correct Answer is ["Surgical neck of the humerus"]
Explanation
The surgical neck of the humerus is a part of the bone that lies below the greater and lesser tubercles and is a common site for fractures.
It is the most constricted part of the humerus and marks the transition between the expanded proximal end and the narrower shaft.
The neck is located between the tuberosities and is the site of attachment for the capsule of the shoulder joint.
The axillary nerve and posterior circumflex humeral artery also pass through the surgical neck.
The anatomy of the surgical neck is important in the diagnosis and treatment of shoulder injuries and fractures.
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