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At which two reference points does the comb leave the head?

A. Apex and occipital bone
B. Occipital bone and parietal ridge
C. Parietal ridge and apex
D. Four corners and apex

Answer :

Final answer:

The comb leaves the head at the reference points of the occipital bone and the parietal ridge (option b). The occipital bone is in the posterior skull, and the parietal ridge is part of the upper lateral parietal bone.

Explanation:

The reference points at which the comb leaves the head would be the Occipital bone and the Parietal ridge. The Occipital bone is a single bone that forms the posterior skull and posterior base of the cranial cavity. It has a small protrusion called the external occipital protuberance, to which a ligament of the posterior neck attaches.

Next to this protrusion, you find the superior nuchal line, representing the most superior point at which neck muscles attach to the skull. Meanwhile, the Parietal ridge (Parietal bone) forms most of the upper lateral side of the skull (it is bounded by frontal bone anteriorly, temporal bone inferiorly and occipital bone posteriorly.). Hence, the answer is option b) Occipital bone and parietal ridge.

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