. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 476 SEMEN. margin of the body which projects at the posterior part into an obtuse angle. In the rat (fig. 325. A) the body is very long, but narrow in proportion, and bent like Fig. A. Spermatozoa of the Rat; B, of the common Mouse. a sabre at the anterior extremity. The body of the spermatozoa of the domestic mouse is shorter, and may be compared to a bent bistoury. The anterior end, how- ever, is likewise drawn out into a short point, which in the field mouse is very slightly de- veloped. The differences in the c
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 476 SEMEN. margin of the body which projects at the posterior part into an obtuse angle. In the rat (fig. 325. A) the body is very long, but narrow in proportion, and bent like Fig. A. Spermatozoa of the Rat; B, of the common Mouse. a sabre at the anterior extremity. The body of the spermatozoa of the domestic mouse is shorter, and may be compared to a bent bistoury. The anterior end, how- ever, is likewise drawn out into a short point, which in the field mouse is very slightly de- veloped. The differences in the caudal appen- dages of the spermatozoa among the mammalia may be reduced to mere differences in length and thickness. In all of them the anterior part attached to the body distinguishes itself from the posterior part by its thickness, but not always to the same extent. Wherever the spermatozoa distinguish themselves by their length, the tail is likewise proportionally thick. Dujardin* occasionally observed in the spermatozoa of men, at the commencement of the tail part, a small irregularly shaped protuberance, which KHHikcr (who had like- wise observed this in the semen of rabbits) * Annal. des Sciences, 1837, t. vii. p. 291. supposes to be a mere temporary pheno- menon— only a phenomenon of developement —and that it subsequently disappears, whilst its adhesive matter is expended in the pro- longation of the tail. This assumption like- wise appears to us possible, although it is remarkable that such swellings or protuber- ances are so rarely met with, and, therefore, certainly cannot be considered as constant associates of the developement. We have only observed a few cases of this description, and that principally in the semen of rabbits. The swellings, which in their physical condition, especially in their refracting power, coincide entirely with the anterior body, have gene- rally a globular shape, but exhibit otherwise many differences in size and position. They are fou
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