. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. Spermatozoon of Helix pomatia. in the interior of its developing cell. (After Kolliher.) observations of Kolliker, the head is produced first, being at first of a less regular, un- wieldy shape. The tail is formed subse- quently, attaching itself in spiral windings to the internal surface of the cell wall. On the spermatozoa being sufficiently developed, the vesicle of developement is dissolved, and the spermatozoa get into the cavity of the exter- nal cell {fig. 360.). Here they may usually Fig. Spermatozoa of Hel
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. Spermatozoon of Helix pomatia. in the interior of its developing cell. (After Kolliher.) observations of Kolliker, the head is produced first, being at first of a less regular, un- wieldy shape. The tail is formed subse- quently, attaching itself in spiral windings to the internal surface of the cell wall. On the spermatozoa being sufficiently developed, the vesicle of developement is dissolved, and the spermatozoa get into the cavity of the exter- nal cell {fig. 360.). Here they may usually Fig. Spermatozoa of Helix pomatia in the interior of their mother cells. be perceived with great distinctness, whilst they can but rarely be distinguished in the in- terior of the real cells of developement. At first the mother cells retain their original round form, even after the reception of the spermatozoa. They soon, however, on the windings of the fibres being stretched, extend themselves lengthwise, and assume an ellipti- cal or pyriform shape. At a still later period the cell pushes forward (at the point where the heads of the spermatozoa are situated) a long pedicle-formed process, which contains the anterior extremity of the spermatozoa (Jig. 361.). The point of this process or continu- ation constantly remains connected with the central globule of the former mass of vesi- cles, whilst the posterior belly-like part of the cell removes itself further and further from it. The same attachment takes place after- wards with the heads of the spermatozoa, on their being projected from the anterior end of this process, which usually happens soon. At this period the mass of vesicles reminds us. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Todd, Robert Bentley, 1809-1860. London, Sherwood, Gilbert, and Piper
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Keywords: ., bo, booksubjectanatomy, booksubjectphysiology, booksubjectzoology
