Intraembryonic Mesoderm And Fertilization

Intraembryonic Mesoderm And Fertilization

Question 1. Intraembryonic mesoderm.

Answer:

• The embryonic disc is made up of three germ layers – ectoderm, mesoderm and endoderm.
• The mesoderm layer present within the embryonic disc is known as intra – embryonic mesoderm.
• It spreads throughout the disc except in the region of the prochordal plate,
• It shows three subdivision.
  1. Paraxial mesoderm.
     • It is the mesoderm next to the middle line.
     • It undergoes segmentation to form somites.
  2. Later plate mesoderm.
     • Lateral plate mesoderm.
     • It contains intra-embryonic coelem.
  3. Intermediate mesoderm.
     • It is a strip of mesoderm present between the lateral plate mesoderm and the paraxial mesoderm.

• Time of formation: 19 days of IU life.

Question 2. Fertilization
Answer:

• It is the process by which male and female gametes fuse
• It occurs in the ampullary region of the uterine tube