. The comparative anatomy of the domesticated animals. Veterinary anatomy. 702 THE NERVES. be, there is never any fusion of tlie nervous ramuscules, but simple aggrega- tion of tbeir fibres, which always preserve their independence, characters, and si^ecial properties. These anastomoses, then, differ essentially from those of arteries, and never permit two trunks to mutually supplement each other when the course of one is interrupted. The nerves destined to the organs of vegetative life, and which arise from the two subspinal chains in whose formation nearly every pair cf nerves concurs, compo
. The comparative anatomy of the domesticated animals. Veterinary anatomy. 702 THE NERVES. be, there is never any fusion of tlie nervous ramuscules, but simple aggrega- tion of tbeir fibres, which always preserve their independence, characters, and si^ecial properties. These anastomoses, then, differ essentially from those of arteries, and never permit two trunks to mutually supplement each other when the course of one is interrupted. The nerves destined to the organs of vegetative life, and which arise from the two subspinal chains in whose formation nearly every pair cf nerves concurs, comport themselves in their distribution in a slightly different manner. They are enlaced around arteries, forming on these vessels very complicated plexiform networks, and yet the fibres composing them are as absolutely independent as in the anastomoses above described. Termination of the Nerves.—This jDoint should be examined separately in the case of the motor and the sensitive nerves: that is, in the muscles and the integumentary membranes. The distinction, however, is not quite so absolute as this, for the muscles always receive some sensitive tubes with their motor filaments. In entering the muscles the motor nerves divide their branches, still appearing as double-contoured tubes. It was at one time believed that these fibres formed loops (Valentin) in the interior of the muscle, and returned to their starting point. This opinion has become obsolete since the ultimate termination of the nerves has been studied by Eouget, Krause, Fig. MUSCULAR FIBRES, WITH TERMINATION OF MOTOR NERVE; FROM THE GASTROCNEMIUS OF THE RANA ESCULENTA. a, Terminal pencil of a dark-bordered nerve-fibre; b, Intramuscular naked axis- cylinder; c. Nucleus of the neurilemma; d, Clarate extremities of the nerve; e. Spaces of the muscle-nuclei ; /, Terminal knob of nerve, with centi'al fibres and vesicular dilatations of the nerve Kuhne. KoUiker, Engelmann, Conheim (Beale), and others. What is known
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