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Microanatomy of crayfish thoracic cord and roots
Author(s) -
Sutherland Rodrigue M.,
Nunnemacher Rudolph F.
Publication year - 1968
Publication title -
journal of comparative neurology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.855
H-Index - 209
eISSN - 1096-9861
pISSN - 0021-9967
DOI - 10.1002/cne.901320402
Subject(s) - biology , crayfish , anatomy , ventral nerve cord , sensory system , spinal cord , thorax (insect anatomy) , electron microscope , nerve fiber , crustacean , claw , nervous system , neuroscience , zoology , ecology , optics , physics
For a thorough understanding of the functions of the crustacean nervous system a knowledge of all its components is necessary. The use of the electron microscope provides accurate data of the number, size, and distribution of fibers in nerve tissue. Nerve fiber counts determined by electron microscope mapping show increases of 20 to 60% in the number of fibers over those determined by light optics. In Orconectes , the number of fibers reach close to 9,500 in the thoracic cord, 20,000 in the main walking leg roots, and 83,000 in the main claw leg roots. Fiber size distributions indicate general motor and sensory patterns of function in the thorax. High percentages (97–99) of fine and small fibers in the roots to the legs suggest the presence of multitudinous sensory‐associated organelles.