Answer: it is only a hormone storage area that receives hormones from the hypothalamus for release
Endocrine glands are glands that secrete products, hormones, directly into the blood rather than through a duct. The pituitary gland is one of the major glands of the endocrine system but the posterior lobe itself serves only a storage area of hormone and do not do the function of a true endocrine gland which is to secrete hormones