Pituitary gland
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Sagittal section of the diencephalon of a pigeon (HE): overview of the pituitary gland (1)
The adenohypophysis derives from the pharyngeal epithelium (Rathke’s pouch) and consists of a pars distalis or anterior lobe (lobus anterior) and a pars tuberalis. A pars intermedia is lacking.
The adenohypophysis of a chicken, duck and goose has an elongated shape, whereas in a pigeon it is more compressed and rounded.