Stowell.] 94. [March 2, 
the N. pharyngeus, a branch of the vagus. PI. phar., the plexus pha- 
ryngeus. Pl. tym., the tympanic plexus over the promontory of the tym- 
panum. §., the cephalic cervical ganglion of the sympathic ganglion, 
just entad and cephalad of the G. inferius. Ton., the tonsillar branch. 
Tym., the tympanic ramus or Jacobson’s nerve. Vagus, the central 10 
mm. of the vagus nerve, showing the relations of the ganglia. 1. Anas- 
tomotic filament from G. petrosum to 8. 2. Communicating branch to 
the G. inferius. 8. Branch to the plexus gangliformis ; this is the doubtful 
accession from the N. accessorius. 4. Anastomotic filament to the R. 
auricularis, 
BIBLIOGRAPHY. 
For bibliography consult previous papers. The Trigeminus Nerve in 
the Domestic Cat; Proceedings of the American Philosophical Society, 
Vol. xxiii, pp. 459-478 ; 1886. Also, The Facial Nerve in the Domestic 
Cat ; Proceedings of the American Philosophical Society, Nov. 5, 1886. 
The Accessory Nerve in the Domestic. Cat. By T. B. Stowell, A.M., Ph.D 
(Read before the American Philosophical Society, March 2, 1888.) 
Synonymy.—N. accessorius ; Accessory of the Par Vagum ; Accessory 
nerve of Willis ; Spinal accessory ; Superior respiratory ; Eleventh pair 
of encephalic nerves. 
General Characters.—This nerve is called accessory because of its large 
accessions to the N. vagus, in the G. jugulare and in the plexus just peri- 
pherad, v. description below; it is called myelic and spinal from the fact 
of its widely distributed origin along the cervical myel, v. below. The 
nerve is an attractive study alike to the anatomist and to the physiologist ; 
its origin, distribution, terminal plexuses and its action upon respiratory 
movements, laryngeal phonation and the heart are equally distinctive. It 
combines a large group of myelic funiculi with a few from the medulla; ; 
by virtue of its accessions to the Vagus it sustains structural relations with 
the N. pharyngeus and with the -N. laryngeus caudalis (Rami of the 
Vagus), indeed a large share of the motor fibres of the Vagus is referable 
to the accessions from the Accessorius [Longet, Systtme Nerveux, t. fi, 
p. 265 ; Cl. Bernard, Legons sur la Physiologie du Systéme Nerveux, t. 
ii, p. 244]; by an anastomotic ramus it joins the N. hypoglossus, and in 
its terminal filaments it makes numerous plexuses with the cervical myelic 
nerves. M. Claude Bernard by his method of evulsion demonstrated that 
laryngeal phonation is due to the action of the accessory nerve. The pro- 
longed cries of many mammals seem to confirm his conclusions and are 
due, in part, atleast, to the rigidity of the cervical muscles in sustained 
expiratory movements. According to Heidenhain, this accession gives 
cardio-inhibitory fibres to the Vagus. 
