单词	pituatary gland
释义	DictionarySeepituitary glandMedicalSeePITUITARY GLAND: Hormones secreted by the anterior and posterior pituitary gland, along with target organs pituitary gland A small, gray, rounded gland that develops from ingrown oral epithelium (Rathke pouch) and is attached to the lower surface of the hypothalamus by the infundibular stalk. The Rathke pouch portion forms the anterior lobe and an intermediate area; the neural tissue of the infundibular stalk forms the posterior lobe. The pituitary gland averages 1.3 × 1.0 ×0.5 cm in size and weighs 0.55 to 0.6 g. Synonym: hypophysis; hypophysis cerebri See: illustration Function The pituitary is an endocrine gland secreting a number of hormones that regulate many bodily processes including growth, reproduction, and other metabolic activities. It is often referred to as the “master gland of the body.” Hormones are secreted in the following lobes: Intermediate lobe: In cold-blooded animals, intermedin is secreted, influencing the activity of pigment cells (chromatophores) of fishes, amphibians, and reptiles. In warm-blooded animals, no effects are known. Anterior lobe: Secretions here are the somatotropic, or growth hormone (STH or GH), which regulates cell division and protein synthesis for growth; adrenocorticotropic hormone (ACTH), which regulates functional activity of the adrenal cortex; thyrotropic hormone (TTH or TSH), which regulates functional activity of the thyroid gland; and prolactin, also called lactogenic hormone, which induces secretion of milk in the adult female. The gonadotropic hormones are as follows: in women, follicle-stimulating hormone (FSH) stimulates development of ovarian follicles and their secretion of estrogen; in men, it stimulates spermatogenesis in the testes. In women, luteinizing hormone (LH) stimulates ovulation and formation of the corpus luteum and its secretion of estrogen and progesterone. In men, LH also called interstitial cell-stimulation hormone (ICSH), stimulates testosterone secretion. Posterior lobe: Hormones are secreted by the neurosecretory cells of the hypothalamus and pass through fibers of the supraopticohypophyseal tracts in the infundibular stalk to the neurohypophysis, where they are stored. Secretions here are oxytocin, which acts specifically on smooth muscle of the uterus, increasing tone and contractility, and antidiuretic hormone (ADH), which increases reabsorption of water by the kidney tubules. In large amounts, ADH also causes vasoconstriction, and is also called vasopressin. Disorders Hypersecretion of anterior lobe causes gigantism, acromegaly, and pituitary basophilism (Cushing disease). Hyposecretion of anterior lobe causes dwarfism, pituitary cachexia (Simmonds disease), Sheehan syndrome, acromicria, eunuchoidism, or hypogonadism. Posterior lobe deficiency or hypothalamic lesion causes diabetes insipidus. Anterior and posterior lobe deficiency and hypothalamic lesion cause Fröhlich syndrome (adiposogenital dystrophy) and pituitary obesity. See also: gland pituitary gland The central controlling gland in the ENDOCRINE system. The pituitary is a pea-sized gland that hangs by a stalk from the underside of the brain and rests in a central bony hollow on the floor of the skull. The pituitary stalk emerges immediately under the HYPOTHALAMUS and there are numerous connections, both nervous and hormonal, between the hypothalamus and the gland. The pituitary releases many hormones that regulate and control the activities of other endocrine glands as well as many body processes. Hormonal feedback information from the various endocrine glands to the hypothalamus and the pituitary ensures that the pituitary is able to perform its control function effectively. See also ADRENOCORTICOTROPIC HORMONE, ANTIDIURETIC HORMONE, FOLLICLE-STIMULATING HORMONE, LUTEINIZING HORMONE, MELANOCYTE-STIMULATING HORMONE, OXYTOCIN, PROLACTIN, and THYROID-STIMULATING HORMONE, Pituitary gland The pituitary gland is sometimes referred to as the "master gland." As the most important of the endocrine glands (glands which release hormones directly into the bloodstream), it regulates and controls not only the activities of other endocrine glands but also many body processes.Mentioned in: Adrenocorticotropic Hormone Test, Antidiuretic Hormone (ADH) Test, Cholesterol-Reducing Drugs, Goiter, Growth Hormone Tests, Histiocytosis X, Hypothyroidism, Menopause, Prolactin Test, Stress Reduction, Thyroid Hormones pi·tu·i·tar·y gland (pi-tū'i-tar-ē gland) [TA] Unpaired compound gland suspended from base of the hypothalamus by a short extension of infundibulum; the infundibular or pituitary stalk. Synonym(s): hypophysis [TA] . ">Pituitary gland pituitary gland, along with target organs " href="javascript:eml2('davisTab', 'g13.jpg')">PITUITARY GLAND: Hormones secreted by the anterior and posterior pituitary gland, along with target organs pituitary gland A small, gray, rounded gland that develops from ingrown oral epithelium (Rathke pouch) and is attached to the lower surface of the hypothalamus by the infundibular stalk. The Rathke pouch portion forms the anterior lobe and an intermediate area; the neural tissue of the infundibular stalk forms the posterior lobe. The pituitary gland averages 1.3 × 1.0 ×0.5 cm in size and weighs 0.55 to 0.6 g. Synonym: hypophysis; hypophysis cerebri See: illustration Function The pituitary is an endocrine gland secreting a number of hormones that regulate many bodily processes including growth, reproduction, and other metabolic activities. It is often referred to as the “master gland of the body.” Hormones are secreted in the following lobes: Intermediate lobe: In cold-blooded animals, intermedin is secreted, influencing the activity of pigment cells (chromatophores) of fishes, amphibians, and reptiles. In warm-blooded animals, no effects are known. Anterior lobe: Secretions here are the somatotropic, or growth hormone (STH or GH), which regulates cell division and protein synthesis for growth; adrenocorticotropic hormone (ACTH), which regulates functional activity of the adrenal cortex; thyrotropic hormone (TTH or TSH), which regulates functional activity of the thyroid gland; and prolactin, also called lactogenic hormone, which induces secretion of milk in the adult female. The gonadotropic hormones are as follows: in women, follicle-stimulating hormone (FSH) stimulates development of ovarian follicles and their secretion of estrogen; in men, it stimulates spermatogenesis in the testes. In women, luteinizing hormone (LH) stimulates ovulation and formation of the corpus luteum and its secretion of estrogen and progesterone. In men, LH also called interstitial cell-stimulation hormone (ICSH), stimulates testosterone secretion. Posterior lobe: Hormones are secreted by the neurosecretory cells of the hypothalamus and pass through fibers of the supraopticohypophyseal tracts in the infundibular stalk to the neurohypophysis, where they are stored. Secretions here are oxytocin, which acts specifically on smooth muscle of the uterus, increasing tone and contractility, and antidiuretic hormone (ADH), which increases reabsorption of water by the kidney tubules. In large amounts, ADH also causes vasoconstriction, and is also called vasopressin. Disorders Hypersecretion of anterior lobe causes gigantism, acromegaly, and pituitary basophilism (Cushing disease). Hyposecretion of anterior lobe causes dwarfism, pituitary cachexia (Simmonds disease), Sheehan syndrome, acromicria, eunuchoidism, or hypogonadism. Posterior lobe deficiency or hypothalamic lesion causes diabetes insipidus. Anterior and posterior lobe deficiency and hypothalamic lesion cause Fröhlich syndrome (adiposogenital dystrophy) and pituitary obesity. See also: gland pituitary gland The central controlling gland in the ENDOCRINE system. The pituitary is a pea-sized gland that hangs by a stalk from the underside of the brain and rests in a central bony hollow on the floor of the skull. The pituitary stalk emerges immediately under the HYPOTHALAMUS and there are numerous connections, both nervous and hormonal, between the hypothalamus and the gland. The pituitary releases many hormones that regulate and control the activities of other endocrine glands as well as many body processes. Hormonal feedback information from the various endocrine glands to the hypothalamus and the pituitary ensures that the pituitary is able to perform its control function effectively. See also ADRENOCORTICOTROPIC HORMONE, ANTIDIURETIC HORMONE, FOLLICLE-STIMULATING HORMONE, LUTEINIZING HORMONE, MELANOCYTE-STIMULATING HORMONE, OXYTOCIN, PROLACTIN, and THYROID-STIMULATING HORMONE, Pituitary gland The pituitary gland is sometimes referred to as the "master gland." As the most important of the endocrine glands (glands which release hormones directly into the bloodstream), it regulates and controls not only the activities of other endocrine glands but also many body processes.Mentioned in: Adrenocorticotropic Hormone Test, Antidiuretic Hormone (ADH) Test, Cholesterol-Reducing Drugs, Goiter, Growth Hormone Tests, Histiocytosis X, Hypothyroidism, Menopause, Prolactin Test, Stress Reduction, Thyroid Hormones pi·tu·i·tar·y gland (pi-tū'i-tar-ē gland) [TA] Unpaired compound gland suspended from base of the hypothalamus by a short extension of infundibulum; the infundibular or pituitary stalk. Synonym(s): hypophysis [TA] .
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