AIM: To investigate the change of adrenocorticotropic hormone (ACTH) cells and thyroid- stimulating hormone(wn) cells of pars distalls of pituitary gland of morphine dependent dependent rats and its restoration after withdrawal.

• 目的：观察吗啡依赖大鼠及戒断大鼠垂体远侧部促肾上腺皮质激素（ACTH）细胞和甲状腺刺激激素（TSH）细胞的变化。