Which of the following bones is NOT part of the axial skeleton?
Sacrum.
Hyoid.
Ribs.
Scapula.
The Correct Answer is D
The scapula is a flat bone that forms part of the shoulder girdle and belongs to the appendicular skeleton.
The appendicular skeleton consists of the bones of the limbs and the girdles that attach them to the axial skeleton.
Choice A is incorrect because sacrum is a triangular bone that forms the posterior part of the pelvic girdle and belongs to the axial skeleton.
The axial skeleton consists of the bones of the head and trunk of a vertebrate.
Choice B is incorrect because hyoid is a U-shaped bone that lies in the anterior neck and belongs to the axial skeleton.
The hyoid bone supports the tongue and provides attachment for some muscles of swallowing and speech.
Choice C is incorrect because ribs are long curved bones that form the rib cage and belong to the axial skeleton.
The ribs protect the thoracic organs and assist in breathing.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
The mastoid process is a bony projection of the temporal bone at the posterior base of the skull.
It allows the attachment of muscles such as the sternocleidomastoid and splenius capitis.
It also contains air-filled spaces called the mastoid air cells.
Choice A is incorrect because the occipital bone forms the back and base of the skull and does not have a mastoid process.
Choice B is incorrect because the sphenoid bone is a butterfly-shaped bone at the base of the skull that does not have a mastoid process.
Choice C is incorrect because the frontal bone forms the forehead and the upper part of the eye sockets and does not have a mastoid process.
Correct Answer is ["Clavicular notch"]
Explanation
The clavicular notch, also known as the sternal notch, is a shallow, V-shaped depression located at the superior aspect of the sternum, which is the long, flat bone in the center of the chest.
The clavicular notch serves as the articulation site for the medial end of the clavicle bone, forming the sternoclavicular joint.
This joint allows for movements of the clavicle and shoulder girdle, including elevation and depression of the shoulder and rotation of the scapula
.
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