Wilson, Membrana Tympani. 467 



fixed in osmic acid. As the results were practically the same in 

 all, those in the monkey only will be given. 



A monkey (Macacus rhesus) had the left n. auriculo-temporalis 

 cut as stated above; it was kept alive for eight days and then 

 killed. On the right side numerous well-stained nerve bundles 

 were seen passing from the pars flaccida over the plicae, and from 

 the limbus on to the membrana tensa, as in Fig. 5. On the left 

 side no large bundles were seen, but a few fibers well stained and 

 normal passed over the pars flaccida and distributed themselves 

 irregularly over the membrana tensa, dividing in the fibrous tissue 

 where they appeared to end. Under the high power it was pos- 

 sible to make out pale strands corresponding to the position of the 

 nerve bundles of the right ear. In the cuticular layer from the 

 osseous part of the external auditory meatus on the right side the 

 medullary sheaths were normal; on the left side most, but not all, 

 of the nerves showed the preliminary stages of nerve degeneration. 

 It was also ascertained that in the monkey certain fibers came to 

 the membrane along the posterior auricular branch of the n. fa- 

 cialis, which branch comes off^ after the n. facialis receives a branch 

 from the ganglion jugulare n. vagi just above the stylo-mastoid 

 foramen. So constant were these results that I feel justified in 

 stating that the principal nerve supply to the membrana tympani 

 is the n. auriculo-temporalis. Further, in the monkey at any 

 rate, the nondegenerated fibers, which were few in number, had 

 come from the n. auricularis posterior but were probably derived 

 from the vagus as in man. 



LITERATURE CITED. 

 Calami DA, U. 



Terminazioni nerv'ose nella membrana timpanica. Arch. Jtal. di Otohgia, vol. 1 1, p. 326-329. 

 1 901. 

 Deinike, D. 



Ueber die Nerven des Trommelfells. Arch. f. mikr. Anal., Bd. 66, S. n6-i20. 1905. 

 Jacques, P. 



De la fine innervation de la membrane du tympan. XIII Cong, internat. du medicin. Sect. 

 d'Otologie, p. 46, Par/i. 1904. 

 Kessel, J. 



Das aussere Ohr. Handbuch der Lehre von den Geweben herausgeben von S. Stricker, Bd. 

 2, S. 853, Leipzig. 1872. 



