The epithelium of the tubule consists of a type of sustentacular cells known as Sertoli cells, which are tall, columnar type cells that line the tubule. In between the Sertoli cells are spermatogenic cells, which differentiate through meiosis to sperm cells.Sertoli cells function to nourish the developing sperm cells. They secrete testis-determining factor, a binding protein which increases the concentration of testosterone inside the seminiferous tubules.he seminiferous tubules are formed from the testis cords that develop from the primitive gonadal cords, formed from the gonadal ridge. Seminiferous tubule (right) with sperm (black, tiny, ovoid).
Envy is among the things that comes from the heart, defiling a person. The whole body is full of darkness when the eye, the lamp of body, is bad. He who is glad at calamity will not go unpunished, said Solomon. Envy ruins the body's health, making bones rot and prohibiting the inheritance of the kingdom of God.
The blend of jealousy and envy is a debiltating kick in the emotional solar plexus. See the book, The Joy of Pain: Schadenfreude and the Dark Side of Human Nature, for more on these and related topics, especially on envy.