\hˌa͡ɪpə͡ʊfˈɪziz], \hˌaɪpəʊfˈɪziz], \h_ˌaɪ_p_əʊ_f_ˈɪ_z_i_z]\
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By DataStellar Co., Ltd
1. Pituitary body, a small two-lobed body at the base of the brain lying in the pituitary fossa of the sphenoid bone. The smaller posterior lobe is developed from the brain to which it is attached by the infundibulum; it contains little or no brain substance but is composed chiefly of connective tissue and blood-vessels. The larger anterior lobe is developed from the buccal cavity; it consists of tubules lined with epithelium and surrounded by a capillary network; it is a closed gland, resembling the thyroid, and furnishes an internal secretion which influences the blood-pressure. Also called hypophysis cerebri. 2. In botany, the cell in the undifferentiated embryo body of an angiosperm from which the primary root is developed.
By Stedman, Thomas Lathrop
By Robley Dunglison
Word of the day
- or post-neural lobe gland. infundibulum is considered part of the posterior pituitary by most authors.