Definition of cortex
corticesplay \ˈkȯr-tə-ˌsēz\ or
1a (1) : the outer or superficial part of an organ or bodily structure (such as the kidney, adrenal gland, or cerebellum or a bone); especially : cerebral cortex (2) : the proteinaceous usually pigmented layer of a hair below the cuticleb : the outer part of some organisms (such as paramecia)
2 : a plant bark or rind (such as cinchona) used medicinally
3a : the typically parenchymatous layer of tissue external to the vascular tissue and internal to the corky or epidermal tissues of a green plant; broadly : all tissues external to the xylemb : an outer or investing layer of various algae, lichens, or fungi
Recent Examples of cortex from the Web
Earlier research found that chronic pain is coupled with alterations and hyperactivity in a pain-processing region of mammalian brains called the primary somatosensory cortex, or S1.
SuperAgers like Scott, however, lose less brain volume—one study found that over the course of 18 months, 'normal' agers lost volume in the cortex (the brain area linked to critical thinking) twice as fast as SuperAgers.
The combination of social media pressure and an underdeveloped prefrontal cortex, the region of the brain that helps us rationalize decisions, control impulsivity and make judgments, can contribute to offensive online posts.
By the peak Aphex Twin had scrambled the cerebral cortexes of everyone in attendance with a prismatic set that was at once schizophrenic, gorgeous and maniacal.
These individuals showed an increase in brain activity in the cortex, the outermost layer of the brain, which is involved in learning.
Research in animals and humans also shows that the drug reduces functioning in the orbitofrontal cortex, which controls decision-making abilities.
Birds lack an elaborate cerebral cortex, the part of the brain in mammals responsible for many cognitive functions such as thought, language, memory, and consciousness.
Although the initial processing of the vOICe’s soundscapes occurred in the auditory cortex, subsequent tasks, such as identifying objects, occurred in the same regions of the brain as in sighted people.
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'cortex.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
CORTEX Defined for English Language Learners
Definition of cortex for English Language Learners
medical : the outer layer of an organ in the body and especially of the brain
Medical Definition of cortex
1a: the outer or superficial part of an organ or body structure (as the kidney, adrenal gland, or a hair); especially : cerebral cortexb: the outer part of some organisms (as paramecia)
2a: a plant bark or rind (as cinchona) used medicinallyb: the peel of any of several fruits—used especially in the writing of medical prescriptions
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