Brain originates from which germ layer
Ectoderm
Mesoderm
Endoderm
Ectomesoderm
$A$ : Leydig’s cells synthesise and secrete testicular hormones called androgens.
$R$ : Leydig’s cells are located between the Sertoli cells.
At what stage the primitive streak in the chick embryo is formed
Each seminiferous tubule is lined on its inside by two types of cells $A$ and $B$. Which of the following options is correct, w.r.t. the type of cell and its function?
$A$ | $B$ |
During the development, the point of entry of sperm in the eggs at fertilization
The development of eye in vertebrate embryology is studied under