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A Ganglion of a Leech

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A Ganglion of a Leech.jpg Thumbnails1, 2) Sand worms ( Hermella ): 1) Tubes of Hermella alveolata with its inhabitants (2). 3) Shell tube worm ( Terebella emmalina )Thumbnails1, 2) Sand worms ( Hermella ): 1) Tubes of Hermella alveolata with its inhabitants (2). 3) Shell tube worm ( Terebella emmalina )Thumbnails1, 2) Sand worms ( Hermella ): 1) Tubes of Hermella alveolata with its inhabitants (2). 3) Shell tube worm ( Terebella emmalina )Thumbnails1, 2) Sand worms ( Hermella ): 1) Tubes of Hermella alveolata with its inhabitants (2). 3) Shell tube worm ( Terebella emmalina )Thumbnails1, 2) Sand worms ( Hermella ): 1) Tubes of Hermella alveolata with its inhabitants (2). 3) Shell tube worm ( Terebella emmalina )
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Pear-shaped cells are set round a felt-work of nerve-fibrils (neuropil). A neuro-sensory cell is shown with one fibre directed peripherally, branching on the surface; and one directed centrally, ramifying in the neuropil. Several very slender fibrils from the neuropil pass up the stalk of each ganglion-cell. They join a network near its surface. This net is connected by radiating fibrils with a coarser net which surrounds the nucleus. From the central net a relatively stout fibril passes to muscle-fibres.

Author
The Body at Work
by Alexander Hill
Published 1908
Available from gutenberg.org
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