In this article we will discuss about:- 1. Meaning of Placenta 2. Types of Placenta 3. Organogenesis 4. Functions. Meaning of Placenta: The embryo, specially in eutherian mammals, becomes implanted to the uterine wall. The process of implantation involves tissue interaction and establishment of connection between the uterine wall and the extraembryonic membranes. The region of attachment between the embryonic [...]
The following points highlight the four main developmental organs in vertebrates. The developmental organs are: 1. Brain 2. Eye 3. Heart 4. Kidney. Developmental Organ # 1. Brain: The first important morphogenetic change following gastrulation is the development of the central nervous system. The central nervous system starts as a simple tubular nerve tube which, in course of development, transforms [...]
The upcoming discuss will update you about the difference between spermatogenesis and oogenesis. Difference # Spermatogenesis: 1. Growth phenomena in nucleus and cytoplasm are not pronounced in spermatocytes. 2. Each spermatocyte produces four functional spermatids of equal size. 3. During maturation, (i) Nucleus remains small which may contract during spermiogenesis into a compact elongated mass, (ii) Nuclear fluid is small [...]