Some factors in the development of the amphibian ear vesicle and further experiments on equilibration / by George L. Streeter.

  • Streeter, George Linius, 1873-1948.
Date:
1907
Catalogue details

Licence: In copyright

Credit: Some factors in the development of the amphibian ear vesicle and further experiments on equilibration / by George L. Streeter. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

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    fourth was quite imperfect, consisting of only a large vesicle with a thickened epithelial floor connected by a few nerve cells and fibers with the brain. Fig. 3 Reconstruction of a tadpole labyrinth one month old, which when a primitive ear vesicle was rotated from the normal position i8o° in one direction, so as to lie with invaginated side toward the brain. A section through the same labyrinth is shown in Fig. 4. Enlarged 55 diameters. Fig. 4 Section through the membranous labyrinth shown in Fig. 3. It shows that though originally turned face inward it has developed in the normal attitude, e, endolymphatic appendage; c.c., crus com- mune; sacc., saccule; c. lat., lateral semicircular canal; gang, acust., acoustic ganglion. Enlarged 55 diameters. Transplanted Specimens. The irregularity of form of the six specimens transplanted to the region between the eye and nostril, previously reported,is so great that they give no assistance in solv- Streeter ’06, 1. c., p. 557.