Serpens is unique among the constellations in having two parts, which are not connected -- Serpens Caput (the head of the serpent), and Serpens Cauda (the tail) -- but are separated by Ophiuchus, the serpent holder. Despite their separation, the Bayer designations of the two sections are treated as though they were a single, contiguous constellation. However, this does mean that the constellations bordering one part are different from those bordering the other part: