( ( The ( pituitary gland ) ) ( ( is ( ( connected ( to ( ( the hypothalamus ) ( of ( the brain ) ) ) ) ) ( by ( ( ( ( a stem ) , ) or ) stalk ) ) ) ) . ) )
(ROOT (S (NP (DT The) (JJ pituitary) (NN gland)) (VP (VBZ is) (VP (VBN connected) (PP (TO to) (NP (NP (DT the) (NNS hypothalamus)) (PP (IN of) (NP (DT the) (NN brain))))) (PP (IN by) (NP (NP (DT a) (NN stem)) (, ,) (CC or) (NP (NN stalk)))))) (. .)))
The pituitary gland is connected to the hypothalamus of the brain by a stem, or stalk.
(ROOT (S (NP (DT The) (JJ pituitary) (NN gland)) (VP (VBZ is) (PP (IN in) (NP (DT the) (NN brain)))) (. .)))