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In conclusion, these results provide evidence for a functional subdivision between the pupillary and accommodation related preganglionic motoneurons.
This study also provides evidence for a functional subdivision of this preganglionic population.
Thus, the cat intraocular muscle preganglionic innervation is spatially organized with respect to function, despite the dispersed nature of its distribution.
Organization of the extraocular and preganglionic motoneurons supplying the orbit in the lesser galago.
This functional subdivision in the cat preganglionic distribution should have connectional and physiological consequences.
In the present study, injections of the anterior chamber were used to label the postganglionic and preganglionic afferents to the iris sphincter pupillae muscle.
Thus, these cases provide a picture of the overall preganglionic cell distribution, as demonstrated by a technique different from those previously employed.
The quantitative description of this distribution demonstrated that, despite an apparently diffuse organization, the location of preganglionic motoneurons in the cat is highly stereotypic.
Descriptions of the extent and precise location of the preganglionic motoneuron distribution have varied between studies.
Of the remaining preganglionic motoneurons, roughly 20% of the total are located dorsal to the oculomotor nucleus.
However, the location of the preganglionic cells in nonprimate mammalian species has been more difficult to specify.
The greater petrosal nerve, which carries sensory fibers as well as preganglionic parasympathetic fibers, emerges from the anterior aspect of the ganglion.
This is due to the number of synapses formed by the preganglionic fibers with ganglionic neurons.
The activity of autonomic ganglionic neurons is modulated by preganglionic neurons (also called, improperly but classically, visceral motoneurons) located in the central nervous system.
These fibers continue on into the spinal cord where they synapse with preganglionic autonomic neurons.
