26th May, 2013

Left: Blastulation     Right: Gastrulation
After cleavage, the dividing cells, or morula, becomes a hollow ball, or blastula, which develops a hole or pore at one end. If in the blastula the first pore (blastopore) becomes the mouth of the animal, it is a protostome; if the first pore becomes the anus then it is a deuterostome. The protostomes include most invertebrate animals, such as insects, worms and molluscs, while the deuterostomes include the vertebrates. In due course, the blastula changes into a more differentiated structure called the gastrula.
The gastrula with its blastopore soon develops three distinct layers of cells (the germ layers) from which all the bodily organs and tissues then develop:
The innermost layer, or endoderm, gives rise to the digestive organs, the gills, lungs or swim bladder if present, and kidneys or nephrites.
The middle layer, or mesoderm, gives rise to the muscles, skeleton if any, and blood system.
The outer layer of cells, or ectoderm, gives rise to the nervous system, including the brain, and skin or carapace and hair, bristles, or scales.
Left: Blastulation     Right: Gastrulation
After cleavage, the dividing cells, or morula, becomes a hollow ball, or blastula, which develops a hole or pore at one end. If in the blastula the first pore (blastopore) becomes the mouth of the animal, it is a protostome; if the first pore becomes the anus then it is a deuterostome. The protostomes include most invertebrate animals, such as insects, worms and molluscs, while the deuterostomes include the vertebrates. In due course, the blastula changes into a more differentiated structure called the gastrula.
The gastrula with its blastopore soon develops three distinct layers of cells (the germ layers) from which all the bodily organs and tissues then develop:
The innermost layer, or endoderm, gives rise to the digestive organs, the gills, lungs or swim bladder if present, and kidneys or nephrites.
The middle layer, or mesoderm, gives rise to the muscles, skeleton if any, and blood system.
The outer layer of cells, or ectoderm, gives rise to the nervous system, including the brain, and skin or carapace and hair, bristles, or scales.

Left: Blastulation     Right: Gastrulation

After cleavage, the dividing cells, or morula, becomes a hollow ball, or blastula, which develops a hole or pore at one end. If in the blastula the first pore (blastopore) becomes the mouth of the animal, it is a protostome; if the first pore becomes the anus then it is a deuterostome. The protostomes include most invertebrate animals, such as insects, worms and molluscs, while the deuterostomes include the vertebrates. In due course, the blastula changes into a more differentiated structure called the gastrula.

The gastrula with its blastopore soon develops three distinct layers of cells (the germ layers) from which all the bodily organs and tissues then develop:

  • The innermost layer, or endoderm, gives rise to the digestive organs, the gills, lungs or swim bladder if present, and kidneys or nephrites.
  • The middle layer, or mesoderm, gives rise to the muscles, skeleton if any, and blood system.
  • The outer layer of cells, or ectoderm, gives rise to the nervous system, including the brain, and skin or carapace and hair, bristles, or scales.

Notes

  1. thequeenofice reblogged this from blamoscience
  2. ymmvor reblogged this from blamoscience
  3. space--pigeon reblogged this from blamoscience
  4. hoycjboy reblogged this from blamoscience
  5. onychophorawesome reblogged this from blamoscience
  6. an-inspired-fish reblogged this from blamoscience
  7. alastairing reblogged this from blamoscience
  8. carboman23 reblogged this from blamoscience
  9. qijane reblogged this from blamoscience
  10. alexjonesvevo reblogged this from blamoscience
  11. its-all-fun-and-gay reblogged this from blamoscience
  12. dorodoro reblogged this from blamoscience
  13. mdm-arabi reblogged this from blamoscience
  14. science-boner reblogged this from blamoscience
  15. blamoscience posted this