Text book of Comparative Anatomy volume 1
Text book of Comparative Anatomy volume 1
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This statement, however, requires confirmation.
280 COMPARATIVE ANATOMY CHAP.
There are germ streaks in many worms similar to those in the Hlrudinea, and Lumbricus. But it appears that these do not consist of contiguous rows of cells, but that each germ streak is the product of a single polar cell at the end of the embryo or young larva. We have described these two polar cells in Eupomatus as primitive mesoderm cells. The germ streaks which proceed from them are called mesoderm streaks ; they s...eem to yield the whole mesoderm with the exception of the nervous system. Here, therefore, the rudiments of almost all the mesodermal organs are localised and condensed into two blastomeres w r hich appear at an early stage at the posterior edge of the blastopore.
In the larva of Lopadorhynchus (Polychwta), as the trunk grows, what is called the postoral ventral plate of the ectoderm is said to split from front to back into an inner muscular plate and an outer neural plate, the ventral chord being principally formed from the latter.
What to read after Text book of Comparative Anatomy volume 1?
You can find similar books in the "Read Also" column, or choose other free books by Arnold Lang to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
This statement, however, requires confirmation.
280 COMPARATIVE ANATOMY CHAP.
There are germ streaks in many worms similar to those in the Hlrudinea, and Lumbricus. But it appears that these do not consist of contiguous rows of cells, but that each germ streak is the product of a single polar cell at the end of the embryo or young larva. We have described these two polar cells in Eupomatus as primitive mesoderm cells. The germ streaks which proceed from them are called mesoderm streaks ; they s...eem to yield the whole mesoderm with the exception of the nervous system. Here, therefore, the rudiments of almost all the mesodermal organs are localised and condensed into two blastomeres w r hich appear at an early stage at the posterior edge of the blastopore.
In the larva of Lopadorhynchus (Polychwta), as the trunk grows, what is called the postoral ventral plate of the ectoderm is said to split from front to back into an inner muscular plate and an outer neural plate, the ventral chord being principally formed from the latter.
What to read after Text book of Comparative Anatomy volume 1?
You can find similar books in the "Read Also" column, or choose other free books by Arnold Lang to read onlineMoreLess
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