Notes On the First Cleavage of Lepas
Notes On the First Cleavage of Lepas
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Camera drawings of the llving oviun, showing the rotation of plane of cleavage. a-b marks the constant long asis of the yitelUne membrane (p.), p indicates the second polar body, and y the yolk spherules.
tifera just before the beginning of cleavage is ellipsoidal in form. The yolk spherules at this time lie aggregated at one pole, which is known to be the ultimate posterior ; but during the preparation for division the yolk shifts to one side of the polar area (Fig. i). The vitelline membrane ...closely surround- ing the ovum is rounded at the anterior and somewhat pointed at the posterior pole. It is apparently quite rigid and does not greatly alter in shape during the embryological develop- ment. The second polar body lies within the vitelline mem- brane at the anterior end of the ovum (Fig. i).
Figs. 1-4 illustrate the changes in the external form of the ovum during the first cleavage. They are from camera lucida drawings of a living ovum, made at intervals of four minutes. They were selected f rom a series of fourteen drawings Digitized by Google No.4.] THE FIRST CLEAVAGE 0F LEPAS, 175 made at intervals of one minute.
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You can find similar books in the "Read Also" column, or choose other free books by Maurice Alpheus Bigelow to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Camera drawings of the llving oviun, showing the rotation of plane of cleavage. a-b marks the constant long asis of the yitelUne membrane (p.), p indicates the second polar body, and y the yolk spherules.
tifera just before the beginning of cleavage is ellipsoidal in form. The yolk spherules at this time lie aggregated at one pole, which is known to be the ultimate posterior ; but during the preparation for division the yolk shifts to one side of the polar area (Fig. i). The vitelline membrane ...closely surround- ing the ovum is rounded at the anterior and somewhat pointed at the posterior pole. It is apparently quite rigid and does not greatly alter in shape during the embryological develop- ment. The second polar body lies within the vitelline mem- brane at the anterior end of the ovum (Fig. i).
Figs. 1-4 illustrate the changes in the external form of the ovum during the first cleavage. They are from camera lucida drawings of a living ovum, made at intervals of four minutes. They were selected f rom a series of fourteen drawings Digitized by Google No.4.] THE FIRST CLEAVAGE 0F LEPAS, 175 made at intervals of one minute.
What to read after Notes On the First Cleavage of Lepas?
You can find similar books in the "Read Also" column, or choose other free books by Maurice Alpheus Bigelow to read onlineMoreLess
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