Which of the following bones in the face are the only ones that aren't a pair of bones?
Zygomatic and nasal
Mandible and maxilla
Mandible and vomer
Lacrimal and maxilla
Palatine and vomer
The Correct Answer is C
Choice A reason: Both the zygomatic and nasal bones are paired. Each side of the face has one zygomatic bone and one nasal bone, making them bilateral structures.
Choice B reason: The mandible is unpaired, but the maxilla is paired. Each side of the face has a maxillary bone, so this combination is not entirely correct.
Choice C reason: Mandible and vomer are the correct answer. Both are unpaired bones in the facial skeleton. The mandible forms the lower jaw, and the vomer forms part of the nasal septum. They are midline structures and exist as single bones.
Choice D reason: Both the lacrimal and maxilla are paired bones. Each orbit has a lacrimal bone, and each side of the face has a maxilla.
Choice E reason: The palatine bones are paired, while the vomer is unpaired. This combination is partially correct but not as accurate as choice C.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
Choice A reason: The talus is a tarsal bone in the ankle that articulates with the tibia and fibula. It is not embedded within a tendon and therefore not classified as a sesamoid bone.
Choice B reason: The radius is one of the two long bones in the forearm. It is not a sesamoid bone, as it is not formed within a tendon.
Choice C reason: The femur is the longest and strongest bone in the body, located in the thigh. It is a long bone, not a sesamoid bone.
Choice D reason: The hamate is a carpal bone in the wrist. It is not embedded in a tendon and thus not a sesamoid bone.
Choice E reason: The patella, or kneecap, is the most well-known example of a sesamoid bone. It is embedded within the quadriceps tendon and functions to protect the knee joint and improve leverage during leg extension.
Correct Answer is D
Explanation
Choice A reason: Bone remodeling after an injury is part of the healing process but is not synonymous with ossification. Remodeling involves both bone resorption and formation but is a later stage in bone repair.
Choice B reason: Making a cartilage model of the fetal bone refers to endochondral ossification’s early stage, but ossification itself is the process of converting that cartilage into bone.
Choice C reason: Bone destruction to release calcium is known as bone resorption, primarily carried out by osteoclasts. It is not the same as ossification.
Choice D reason: Bone formation is the correct answer. Ossification is the process by which new bone is formed, either by replacing cartilage (endochondral ossification) or forming directly from mesenchymal tissue (intramembranous ossification).
Choice E reason: Making collagen fibers for calcified cartilage is a component of cartilage development but does not define ossification. Ossification involves mineralization and the transformation of cartilage or mesenchyme into bone.
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