paraganglia


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paraganglion

 [par″ah-gang´gle-on] (pl. paragan´glia)
a collection of chromaffin cells, derived from neural ectoderm, occurring outside of the adrenal medulla, most commonly near the sympathetic ganglia and in relation to the aorta and its branches. Most, if not all, of the paraganglia secrete epinephrine or norepinephrine.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

par·a·gan·gli·a

(par'ă-gang'glē-ă),
Plural of paraganglion.
Farlex Partner Medical Dictionary © Farlex 2012

par·a·gan·gli·a

(par'ă-gang'glē-ă)
Plural of paraganglion.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

paraganglia

(păr″ă-găng′lē-ă) paraganglion [″ + ganglion, knot]
Groups of chromaffin cells, similar in staining reaction to cells of the adrenal medulla, associated anatomically and embryologically with the sympathetic system. They are located in various organs and parts of the body.
Medical Dictionary, © 2009 Farlex and Partners
References in periodicals archive ?
Paraganglia in the head and neck region (Including aorticopulmonary paraganglia), which are in close alignment with the parasympathetic nervous system,
Paragangliomas can derive from parasympathetic or sympathetic paraganglia with similar frequencies.
Scott Jr., "Malignant tumors of nonchromaffi paraganglia," Military Surgeon, vol.
Paragangliomas are rare neuroendocrine tumours that arise from extra-adrenal paraganglia and consist of specialized catecholamine-secreting chromaffin cells.
Although it develops at the sites of normal paraganglia mainly intraabdominally, glomus jugularae or carotid bodies; it may be found in other part of the body also.
The carotid body is bilaterally located at the bifurcation of the carotid artery, which is structurally analogous to vagal paraganglia. The major cell type in the carotid body is type-I glomus cells, which are chemosensitive and responsive to chemical changes in the arterial blood.
Pheochromocytoma and extra-adrenal paraganglioma are rare chromaffin tumours arising from neural crest tissue that develops into sympathetic and parasympathetic paraganglia throughout the body.
Phaeochromocytomas are neuro-endocrine catecholamine-secreting tumours that arise from chromaffin cells of the adrenal medulla or sympathetic paraganglia. Phaeochromocytomas are dubbed the '10% tumour' as 10% are extra-adrenal, 10% bilateral, 10% malignant and 10% familial (Fig.
First, direct stimulation of paraganglia cells by inflammatory cytokines, such as IL-1, results in signaling through afferent fibers.
Balance is normally achieved through negative feedback by the innate immune system interacting with the PNS via IL-1 receptors in the parasympathetic paraganglia [67].
Paragangliomas are rare tumors of the parasympathetic and sympathetic paraganglia. Most parasympathetic paraganglioma (pPGL) present as palpable masses of the neck, originating from chemoreceptors like the carotid sinus.
Pheochromocytomas are uncommon tumors arising from the adrenal medulla and the sympathetic paraganglia. Sympathetic ganglia are found predominantly in the para-axial region of the trunk along the prevertebral and paravertebral sympathetic chains and in the connective tissue in or near the walls of pelvic organs.