. Journal of anatomy . nto areas for the three semicircular canals, the two maculae of theutricle, the macula of the saccule, and the patches for the cochlear canaland lagena. Each of these, as usual, bore away with it a portion of thesyncytium, which thus became subdivided into eight portions (fig. 13). In birds a process similar to that in amphibians was found to take place,our observations on embryos of this class of vertebrates confirming thedescription in a recently published book on the development of the chickby Lillie (17). Thus on page 295 that author states that the acousticganglion
. Journal of anatomy . nto areas for the three semicircular canals, the two maculae of theutricle, the macula of the saccule, and the patches for the cochlear canaland lagena. Each of these, as usual, bore away with it a portion of thesyncytium, which thus became subdivided into eight portions (fig. 13). In birds a process similar to that in amphibians was found to take place,our observations on embryos of this class of vertebrates confirming thedescription in a recently published book on the development of the chickby Lillie (17). Thus on page 295 that author states that the acousticganglion from which the auditory nerve arises, takes its origin from theacoustico-facialis oanoKon which lies in front of and below the centre of Development of the Auditory Nerve in Vertebrates 119 the auditory pit. During the closure of the latter the acoustic gano-lionbecomes fused with part of the wall of the otocyst in such a way that itbecomes impossible to tell in ordinary sections wdiere the epithelial cells Hind Wall of membranouslabyrinth. Fig. 12. — Diagram to show the seven areas into which the sense-epitheliumpatch of the otic vesicle divides in higher fishes, as also the corre-sponding subdivisions of the auditory nerve with their ganglia. leave oft and the ganglion cells begin. This fused area may be called theauditory neuro-epithelium. . The neuro-epithelium is the source of all Hind brain.
Size: 1733px × 1442px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1860, booksubjectanatomy, bookyear1867
