Pituitary gland
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Sagittal section of the pituitary gland of a pigeon (HE): pars distalis of the adenohypophysis
The pars distalis of the adenohypophysis is composed of a cephalic lobe or zone, also called rostral zone (zona rostralis) and a caudal lobe or zone (zona caudalis). These zones are not separated by clear connective tissue strands but can be differentiated in that each zone is characterized by different cell populations.