gyri
(noun)
A ridge on the cerebral cortex (plural of gyrus).
(noun)
Ridges on the cerebral cortex, generally surrounded by one or more sulci.
Examples of gyri in the following topics:
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Cerebral Cortex
- The "valleys" of the wrinkles are called sulci (or sometimes, fissures); the "peaks" between wrinkles are called gyri.
- While there are variations from person to person in their sulci and gyri, the brain has been studied enough to identify patterns.
- As depicted in this diagram of brain structures, sulci are the "valleys" and gyri are the "peaks" in the folds of the brain.
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Sensory Areas
- The primary auditory cortex is located on the transverse gyri that lie on the back of the superior temporal convolution of the temporal lobes.
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Body Cavity Membranes
- It is the meningeal envelope which firmly adheres to the surface of the brain and spinal cord, following the brain's minor contours (gyri and sulci).
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Meninges
- It is the meningeal envelope that firmly adheres to the surface of the brain and spinal cord, following the brain's minor contours (gyri and sulci).
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Brain: Cerebral Cortex and Brain Lobes
- The outermost part of the brain is a thick piece of nervous system tissue called the cerebral cortex, which is folded into hills called gyri (singular: gyrus) and valleys called sulci (singular: sulcus).
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Overview of the Cerebrum
- In larger mammals, the cerebral cortex is folded into many gyri and sulci, which allows it to expand in surface area without taking up much greater volume.
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White Matter of the Cerebrum
- Long association fibers connect different lobes of a hemisphere to each other, whereas short association fibers connect different gyri within a single lobe.
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Cerebral Lobes
- At the front edge of the occipital there are several lateral occipital gyri separated by lateral occipital sulci.
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Mapping the Primary Somatosensory Area
- These are then transmitted from the gyri to the brain stem and spinal cord via corresponding sensory or motor nerves.