Sentence:  Possible changes in pregnancy to explain increased food intake and consequent increased energy storage have been considered in the context of the neural <WSD>circuitry</WSD> in the hypothalamus and brain stem that homeostatically regulates appetite, the mesolimbic <WSD>circuitry</WSD> regulating hedonic appetite, and the actions of circulating hormones on or in this <WSD>circuitry</WSD>. 
Meaning of the word marked with <WSD> tags:  The brain's neural network.