motor cortex (redirected from motor cortices)

cortex /cor·tex/ (kor´teks) pl. cor´tices   [L.] the outer layer of an organ or other structure, as distinguished from its inner substance.cor´tical

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adrenal cortex  the outer, firm layer comprising the larger part of the adrenal gland; it secretes many steroid hormones including mineralocorticoids, glucocorticoids, androgens, 17-ketosteroids, and progestins.

cerebellar cortex , cortex cerebella´ris the superficial gray matter of the cerebellum.

cerebral cortex , cortex cerebra´lis the convoluted layer of gray substance covering each cerebral hemisphere; see archicortex, paleocortex, and neocortex.

cortex len´tis  the softer, external part of the lens of the eye.

motor cortex  see under area.

provisional cortex  the cortex of the fetal adrenal gland that undergoes involution in early fetal life.

renal cortex , cortex re´nis the outer part of the substance of the kidney, composed mainly of glomeruli and convoluted tubules.

striate cortex  the part of the occipital lobe of the cerebral cortex that is the primary receptive area for vision.

cortex of thymus  the outer part of each lobule of the thymus; it consists chiefly of closely packed lymphocytes (thymocytes) and surrounds the medulla.

visual cortex  the area of the occipital lobe of the cerebral cortex concerned with vision.

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motor cortex

n.

The region of the cerebral cortex influencing movements of the face, neck and trunk, and arm and leg. Also called excitable area, motor area, Rolando's area.

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cortex, motor 

Area of the frontal lobe of the brain just anterior to the central sulcus which is responsible for voluntary movements of the eyes (as well as other voluntary movements of other parts of the body). The motor cortex in each hemisphere controls mainly muscles on the opposite side of the body. It is laid out according to the parts of the body, with the region controlling the feet at the top and the region controlling the legs, the trunk, the arms and the head in descending order.