. A text-book of comparative physiology for students and practitioners of comparative (veterinary) medicine . ted into therod-like head of a spermatozoon. N, transverse section of a ripe cell, showingthe bundle of spermatozoa and the passive nucleus (I—N, after Semper). O—b,spermatogenesis in the earth-worm; O, young sperm-cell; P, the same dividedinto four; (), spermatosphere with the central sperm-blastophore; R, a later stage;S, nearly mature spermatozoa. (After Blomfleld.) REPRODUCTION. 63 of the male cell. Once more we are led to see the importanceof this structure in the life of the cell

- Image ID: 2CJ66TG
. A text-book of comparative physiology for students and practitioners of comparative (veterinary) medicine . ted into therod-like head of a spermatozoon. N, transverse section of a ripe cell, showingthe bundle of spermatozoa and the passive nucleus (I—N, after Semper). O—b,spermatogenesis in the earth-worm; O, young sperm-cell; P, the same dividedinto four; (), spermatosphere with the central sperm-blastophore; R, a later stage;S, nearly mature spermatozoa. (After Blomfleld.) REPRODUCTION. 63 of the male cell. Once more we are led to see the importanceof this structure in the life of the cell Stock Photo
Enlarge
https://www.alamy.com/licenses-and-pricing/?v=1 https://www.alamy.com/a-text-book-of-comparative-physiology-for-students-and-practitioners-of-comparative-veterinary-medicine-ted-into-therod-like-head-of-a-spermatozoon-n-transverse-section-of-a-ripe-cell-showingthe-bundle-of-spermatozoa-and-the-passive-nucleus-in-after-semper-obspermatogenesis-in-the-earth-worm-o-young-sperm-cell-p-the-same-dividedinto-four-spermatosphere-with-the-central-sperm-blastophore-r-a-later-stages-nearly-mature-spermatozoa-after-blomfleld-reproduction-63-of-the-male-cell-once-more-we-are-led-to-see-the-importanceof-this-structure-in-the-life-of-the-cell-image372618640.html
. A text-book of comparative physiology for students and practitioners of comparative (veterinary) medicine . ted into therod-like head of a spermatozoon. N, transverse section of a ripe cell, showingthe bundle of spermatozoa and the passive nucleus (I—N, after Semper). O—b,spermatogenesis in the earth-worm; O, young sperm-cell; P, the same dividedinto four; (), spermatosphere with the central sperm-blastophore; R, a later stage;S, nearly mature spermatozoa. (After Blomfleld.) REPRODUCTION. 63 of the male cell. Once more we are led to see the importanceof this structure in the life of the cell
Reading Room 2020 / Alamy Stock Photo
Image ID: 2CJ66TG
This image is a public domain image, which means either that copyright has expired in the image or the copyright holder has waived their copyright. Alamy charges you a fee for access to the high resolution copy of the image.
. A text-book of comparative physiology for students and practitioners of comparative (veterinary) medicine . ted into therod-like head of a spermatozoon. N, transverse section of a ripe cell, showingthe bundle of spermatozoa and the passive nucleus (I—N, after Semper). O—b,spermatogenesis in the earth-worm; O, young sperm-cell; P, the same dividedinto four; (), spermatosphere with the central sperm-blastophore; R, a later stage;S, nearly mature spermatozoa. (After Blomfleld.) REPRODUCTION. 63 of the male cell. Once more we are led to see the importanceof this structure in the life of the cell. Fertilization of the Ovum.—The spermatozoon, lashing itsway along, when it meets the ovum, enters it either through aspecial minute gateway (micropyle), or, if this be not present—as it is not in the ova of all animals—actually penetrates themembranes and substance of the female cell, and continues active till the female pronucleus is reached, when the head entersand the tail is absorbed or blends with the female cell. The nu-cleus of the male cell prior to union with the nucleus of the F.PNt. F.PKt