Relating to the outer part of the nasal cavity or nose, especially in anatomical descriptions of fish and other animals.
From Greek 'ektos' (outside) and 'rhinal' (relating to the nose), combining Greek roots to describe external nasal anatomy in comparative biology.
Fish actually have nostrils divided into outer and inner parts—the ectorhinal region helps them detect food particles in water with incredible sensitivity, giving them a 'super smell'!
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