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 (from Latin invidia) is an emotion which occurs when a person lacks another's superior quality, achievement, or possession and either desires it or wishes that the other lacked it. Bertrand Russell said that envy was one of the most potent causes of unhappiness.
green with envy. wishing very much that you had what someone else has Sharon's going off to the south of France for three weeks and we're all green with envy. See also: envy, green. Full of desire for someone's possessions or advantages; extremely covetous. For example, Her fur coat makes me green with envy. Shakespeare described envy as the green sickness ( Anthony and Cleopatra, 3:2), but the current phrase, dating from the mid-1800s, is the one most often heard. Also see green-eyed monster.