The biceps brachii, triceps brachii, and quadriceps are muscles named according to their:
Location
Number of origins
Shape
Fascicle arrangement
The Correct Answer is B
Choice A reason: While muscle names can reflect location (e.g., brachialis for the arm), the names "biceps," "triceps," and "quadriceps" specifically refer to the number of origins, not their anatomical position.
Choice B reason: "Biceps" means two heads, "triceps" means three heads, and "quadriceps" means four heads. These names are derived from the number of tendinous origins each muscle has, making this the correct classification.
Choice C reason: Muscle shape does influence naming in some cases (e.g., deltoid for triangular), but it is not the basis for naming biceps, triceps, or quadriceps.
Choice D reason: Fascicle arrangement refers to the pattern of muscle fibers (e.g., parallel, pennate), which affects function and strength but is not the naming basis for these specific muscles.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
Choice A reason: Hinge joints allow movement in one plane, such as flexion and extension. Examples include the elbow and knee, but the joint between the radius and ulna does not function this way.
Choice B reason: This is correct. The proximal radioulnar joint is a pivot joint, allowing rotational movement such as pronation and supination of the forearm. The radius rotates around the ulna, enabling the palm to turn up or down.
Choice C reason: Plane or gliding joints allow sliding movements between flat surfaces, such as those between carpal bones. This does not apply to the radius and ulna.
Choice D reason: Saddle joints allow movement in two planes and are found in the thumb (carpometacarpal joint). The radius and ulna do not form a saddle joint.
Choice E reason: Ball-and-socket joints allow movement in multiple directions and are found in the shoulder and hip. The radius and ulna do not form this type of joint.
Correct Answer is C
Explanation
Choice A reason: The sella turcica is correctly named, but it is located on the sphenoid bone, not the ethmoid. This makes the pairing incorrect.
Choice B reason: The crista galli is a projection of the ethmoid bone and serves as an attachment point for the falx cerebri, not for protecting the pituitary gland. Additionally, it is not located on the sphenoid bone.
Choice C reason: This is the correct answer. The sella turcica is a saddle-shaped depression in the sphenoid bone that houses and protects the pituitary gland. It is a central feature of the cranial floor.
Choice D reason: The occipital condyles are located on the occipital bone and articulate with the first cervical vertebra. They have no role in protecting the pituitary gland.
Choice E reason: While the crista galli is correctly paired with the ethmoid bone, it does not protect the pituitary gland. Its function is related to the attachment of meninges.
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