THE MORPHOLOGY AND STRUCTURE OF THE BRAIN OF ORCONECTES VIRILIS (HAGEN) (CRUSTACEA, DECAPODA)

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Abstract
The morphology and histological structure of the supraoesophageal ganglionic mass are reported. The accessory nerve supplying motor fibers to the muscles of the eyestalk, antennules, and antennae, and sensory fibers to the antennules and antennae, is described for the first time. It is suggested that the term optic lobes be applied to those structures previously described as the optic nerves in the stalked-eyed Crustacea. It is further suggested that the term ganglionic mass be applied to compound ganglia such as the arthropod brain.Sixty-one conducting elements are traced and illustrated.This work substantiates the view that the protocerebrum and deutocerebrum have an ancient and close relationship. Both are considered to be preoral. The tritocerebrum was recently acquired by the supraoesophageal ganglionic mass and is postoral in origin.

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