. Anatomischer Anzeiger. Anatomy, Comparative; Anatomy, Comparative. 398 the condition of his material allowed him to speak with any certainly. It is unnecessary therefore to give an account of the general form of the labyrinth or of the relative positions of the recessus utriculi and sacculus or of the passages by which they are connected together and to the utricle (figs. 1—3). With regard to the nerves that supply the several maculge and the cristre of the semicircular canals I find that in Colonel Shepherd's specimen the two main trunks — the ramus anterior and the ramus posterior — (fig.
. Anatomischer Anzeiger. Anatomy, Comparative; Anatomy, Comparative. 398 the condition of his material allowed him to speak with any certainly. It is unnecessary therefore to give an account of the general form of the labyrinth or of the relative positions of the recessus utriculi and sacculus or of the passages by which they are connected together and to the utricle (figs. 1—3). With regard to the nerves that supply the several maculge and the cristre of the semicircular canals I find that in Colonel Shepherd's specimen the two main trunks — the ramus anterior and the ramus posterior — (fig. 1, 2, 3, EA. EP.) are more independent and clearly separated from one another than one would be led to infer from Eetzius's figures (PI. 24, fig. 1—4). Their distribution also overlaps in a way that apparently was not so in his specimen. The ramus anterior supplies the cristas of the anterior and external semicir- cular canals and the macula of the recessus utriculi in the usual way but it also sends a branch of considerable size (fig. 1, E.Ö.) into the territory of the post- erior branch to the anterior and upper end of the macula of the sacculus as figured by Eetzius in Protopterus (PI. 24, fig. 9). This is a condition not at all unusual in sharks and is for instance figured by Professor Stewart^) in Carcharias. In this specimen too I was unable to distinguish a macula lagenie separated from the com- mon macula of the saccule. Owing to the imperfect preservation of his material Eetzius was unable to state whether the macula neglecta — a small nerve ending situated upon the lower surface of the utricle in close proxi- mity to the hinder limit of the utriculo-sacculine passage — was present or not; though as he had seen it in Protopterus he asserted R A- RS -. Fig. 2. The left labyrinth of Neocera- todus forsteri. seen from in front, with part of the wall of the Sacculus, ductus endo- lymphaticus and recessus utriculi removed. Reference letters as in Fig. 1- 1) Ste
Size: 1490px × 1678px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookpublisherjenag, bookyear1913
