expiratory center

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ex·pi·ra·to·ry cen·ter

the region of the medulla oblongata that is electrically active during expiration and where electrical stimulation produces sustained expiration.

expiratory center

Etymology: L, expirare, to breath out; Gk, kentron, center
one of several regions of the medulla, responsible for control of respiration. It is a subregion specifically involved in carrying out the activity of expiration.

expiratory center

The part of the respiratory center, located dorsal to the inspiratory center, that promotes a forced exhalation.
See also: center


a point from which a process starts, especially a plexus or ganglion giving off nerves that control a function.

accelerating center
one in the brainstem involved in acceleration of heart action.
appetite center
located in the hypothalamus; controls appetite.
auditory center
the center for hearing, in the more anterior of the transverse temporal gyri.
cardioinhibitory center
one in the medulla oblongata that exerts an inhibitory influence on the heart.
deglutition center
a nerve center in the medulla oblongata that controls swallowing.
diaphragmatic center
see diaphragmatic tendon.
emetic center
located in the reticular formation of the brainstem, this center controls vomiting.
eructation center
controls eructation in ruminants; located in the medulla oblongata.
expiratory center
one of the four respiratory centers (see below).
germinal center
the area in the center of a lymph node containing aggregations of actively proliferating lymphocytes.
gustatory center
the cerebral center supposed to control taste.
inspiratory respiratory center
one of the four respiratory centers.
lymph node germinal center
centers in lymph nodes where lymphocytes are produced.
medullary respiratory center
the center in the medulla oblongata that coordinates respiratory movements.
motor center
any center that originates, controls, inhibits or maintains motor impulses.
nerve center
a collection of nerve cells in the central nervous system that are associated together in the performance of some particular function.
center of ossification
see ossification center.
perineal center
see perineal body.
reflex center
any nerve center at which afferent sensory information is converted into efferent motor impulses.
respiratory c's
a series of the centers (the apneustic, pneumotaxic and medullary respiratory centers) in the medulla and pons that coordinate respiratory movements.
center-surround retinal organization
the arrangement of cells in the receptive field of the retina; the sensitivity of a certain spot in the retina is affected by what is occurring in adjacent areas.
swallowing center
deglutition center.
thermoregulatory c's
hypothalamic centers regulating the conservation and dissipation of heat.
vasomotor center
a combination of two centers in the reticular formation of the brainstem; includes a pressor and a depressor center.
vomiting center
see emetic center (above).


relating to or employed in the expiration of air from the lungs.

expiratory center
the nerve center in the descending reticular formation which terminates inspiration and triggers the commencement of expiratory movements.
expiratory groan
a groan with each expiration; usually an expression of severe pain or extreme fatigue.
expiratory reserve volume
the volume of air which the patient can still exhale after the tidal volume has been exhaled.