We found a match
Your institution may have rights to this item. Sign in to continue.
- Title
ON THE NATURE OF THE SPERM PATH IN THE AMPHIBIAN EGG.
- Authors
Svensson, Gustav S. O.
- Abstract
1. The fully formed sperm trail and its development has been examined in eggs of Rana temporaria. 2. The pigment trail is usually much more composed than earlier investigations indicate and may conveniently be described as being composed of a principal trail and side-trails and the principal trail must often be characterized as a composite trail. Similar conditions have more or less clearly been observed also in the eggs of Rana arvalis, Bufo bufo, Pelobates fuscus, Xenopus laevis and Amblystoma mexicanum. 3. When the pigment trail arises, both pigment, yolk granules and vacuomes stream into the egg and form the sperm trail. The vacuomes become more or less elongated. It is extremely probably that the general cytoplasm streams in too. 4. Earlier observations and theories concerning the formation of the pigment trail have been reviewed and discussed. None of the previous theories seems to be compatible with the observed facts. It has also been discussed whether the sperm aster can cause the immigration of the constituents of the trail but this does not seem to be the case. The idea has been advanced that the immigration is chiefly produced by a process in the surface layers of the egg in the region of the base of the trail. 5. Some observations have been added to what was already known regarding pigment granules, yolk granules, and vacuomes in the uterine egg of Rana temporaria as well as regarding the formation of the sperm aster and the centrospehere.
- Subjects
SPERMATOZOA; RANA temporaria; BIOLOGICAL pigments; EGGS; XENOPUS laevis; CYTOPLASM
- Publication
Acta Zoologica, 1944, Vol 25, p263
- ISSN
0001-7272
- Publication type
Article
- DOI
10.1111/j.1463-6395.1944.tb00355.x