On the contrary, they are not developed on the endocast of the polar bear.

相反，它们不是在北极熊的颅腔上发育的。

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On the contrary, they are not developed on the cranial endocast of the polar bear, but the blood vessel impressions are developed on the lateral occipital sides in the polar bears.

相反，北极熊的大喻沟回在脑窝内模上留下的印痕不明显，而血管印痕在脑窝枕区的两侧很明显。

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