see under .
a small, somewhat cherry-shaped double structure attached by a stalk to the base of the brain and const-tuting the master endocrine gland affecting all hormonal functions in the body, consisting of an anterior region ((anterior pituitary) or (adenohypophysis)) that develops embryonically from the roof of the mouth and that secretes growth hormone, lh, fsh, acth, tsh, and msh, a posterior region ((posterior pituitary) or (neurohypophysis)) that develops from the back of the forebrain and that secretes the hormones vasopressin and oxytocin, and an intermediate part (pars intermedia) derived from the anterior region but joined to the posterior region, that secretes the hormone msh in lower vertebrates.
the master endocrine gland, attached by a stalk to the base of the brain. its two lobes (the adenohypophysis and neurohypophysis) secrete hormones affecting skeletal growth, development of the s-x glands, and the functioning of the other endocrine glands also called hypophysis, hypophysis cerebri see also adenohypophysis, neurohypophysis
pituitary gland n.
a small, oval endocrine gland attached to the base of the vertebrate brain and consisting of an anterior and a posterior lobe, the secretions of which control the other endocrine glands and influence growth, metabolism, and maturation. also called hypophysis, master gland.
a gland at the base of the brain in vertebrate animals that is divided into two regions, anterior and posterior, each of which secretes important hormones. the anterior portion, whose secretions are directly controlled by the hypothalamus, produces hormones that regulate the function of most of the body’s hormone-producing glands and organs, including the thyroid and adrenal glands. growth hormone is also produced by the anterior pituitary. the posterior pituitary releases antidiuretic hormone (adh) and oxytocin.
pituitary gland [(pi-tooh-uh-ter-ee)]
a small gland, attached to the base of the brain and controlled by the hypothalamus, that functions in the endocrine system. the pituitary gland secretes many hormones: some control the actions of other glands, whereas others influence growth, metabolism, and reproduction.
- Anterior pituitary gonadotropin
anterior pituitary gonadotropin anterior pituitary gonadotropin n. any of several polypeptide or protein hormones secreted by the anterior lobe of the pituitary gland. also called pituitary gonadotropic hormone.
- Anterior pyramid
anterior pyramid anterior pyramid n. see pyramid of medulla oblongata. historical examples next to, and parallel with the anterior fissure is the anterior pyramid (see fig. 2). encyclopaedia britannica, 11th edition, volume 4, slice 4 various
- Anterior pituitarylike hormone
anterior pituitarylike hormone anterior pituitarylike hormone n. see chorionic gonadotropin.
- Anterior rectus muscle of head
anterior rectus muscle of head anterior rectus muscle of head n. a muscle with origin from the transverse process and the lateral m-ss of the atlas, with insertion into the basilar process of the occipital bone, with nerve supply from the first and second cervical nerve, and whose action turns and inclines the head forward.
- Anterior rhinoscopy
anterior rhinoscopy anterior rhinoscopy n. examination of the anterior portion of the nasal cavity.