Brodmann area 7
Encyclopedia
Brodmann area 7 is one of Brodmann
's cytologically defined regions of the brain. It is involved in locating objects in space. It serves as a point of convergence between vision
and proprioception
to determine where objects are in relation to parts of the body.
cortex
in the human brain
. It also corresponds to the precuneus
. Situated posterior to the primary somatosensory cortex (Brodmann areas 3, 1 and 2
), and superior to visual cortices (Brodmann areas 17, 18
and 19
), this region is believed to play a role in visuo-motor coordination (e.g., in reaching to grasp an object).
. It occupies most of the parietal lobe
excluding the postcentral gyrus
and superior parietal lobule
. Brodmann-1909 considered it topologically homologous to the combined superior parietal area 7, the supramarginal area 40 (H) and the angular area 39 (H) of the human. Cytoarchitecurally he regarded it as "a still undifferentiated precursor zone for all parietal areas (apart from area 5)" (Garey-1999). Distinctive features (Brodmann-1905): in area 7 compared to Brodmann area 5
-1909, large ganglion cell
s are absent from the internal pyramidal layer (V); the pyramidal cell
s of the external pyramidal layer (III) sublayer 3b are, on average, larger; the multiform layer (VI) is denser and narrower and more sharply bounded by subcortical white matter
.
Brodmann
Brodmann may refer to:* Korbinian Brodmann, German neurologist* Brodmann area, a region in the brain cortex...
's cytologically defined regions of the brain. It is involved in locating objects in space. It serves as a point of convergence between vision
Visual perception
Visual perception is the ability to interpret information and surroundings from the effects of visible light reaching the eye. The resulting perception is also known as eyesight, sight, or vision...
and proprioception
Proprioception
Proprioception , from Latin proprius, meaning "one's own" and perception, is the sense of the relative position of neighbouring parts of the body and strength of effort being employed in movement...
to determine where objects are in relation to parts of the body.
Human
Brodmann area 7, is part of the parietalParietal lobe
The parietal lobe is a part of the Brain positioned above the occipital lobe and behind the frontal lobe.The parietal lobe integrates sensory information from different modalities, particularly determining spatial sense and navigation. For example, it comprises somatosensory cortex and the...
cortex
Cerebral cortex
The cerebral cortex is a sheet of neural tissue that is outermost to the cerebrum of the mammalian brain. It plays a key role in memory, attention, perceptual awareness, thought, language, and consciousness. It is constituted of up to six horizontal layers, each of which has a different...
in the human brain
Human brain
The human brain has the same general structure as the brains of other mammals, but is over three times larger than the brain of a typical mammal with an equivalent body size. Estimates for the number of neurons in the human brain range from 80 to 120 billion...
. It also corresponds to the precuneus
Precuneus
The precuneus is a part of the superior parietal lobule hidden in the medial longitudinal fissure between the two cerebral hemispheres. It is sometimes described as the medial area of the superior parietal cortex. It is involved with episodic memory, visuospatial processing, reflections upon self,...
. Situated posterior to the primary somatosensory cortex (Brodmann areas 3, 1 and 2
Postcentral gyrus
The lateral postcentral gyrus is a prominent structure in the parietal lobe of the human brain and an important landmark. It is the location of primary somatosensory cortex, the main sensory receptive area for the sense of touch...
), and superior to visual cortices (Brodmann areas 17, 18
Brodmann area 18
-Human:Brodmann area 18, or BA18, is part of the occipital cortex in the human brain. It accounts for the bulk of the volume of the occipital lobe....
and 19
Brodmann area 19
-Human:Brodmann area 19, or BA19, is part of the occipital lobe cortex in the human brain. Along with area 18, it comprises the extrastriate cortex...
), this region is believed to play a role in visuo-motor coordination (e.g., in reaching to grasp an object).
Guenon
Brodmann area 7 is a subdivision of the cytoarchitecturally defined parietal region of cerebral cortexCerebral cortex
The cerebral cortex is a sheet of neural tissue that is outermost to the cerebrum of the mammalian brain. It plays a key role in memory, attention, perceptual awareness, thought, language, and consciousness. It is constituted of up to six horizontal layers, each of which has a different...
. It occupies most of the parietal lobe
Parietal lobe
The parietal lobe is a part of the Brain positioned above the occipital lobe and behind the frontal lobe.The parietal lobe integrates sensory information from different modalities, particularly determining spatial sense and navigation. For example, it comprises somatosensory cortex and the...
excluding the postcentral gyrus
Postcentral gyrus
The lateral postcentral gyrus is a prominent structure in the parietal lobe of the human brain and an important landmark. It is the location of primary somatosensory cortex, the main sensory receptive area for the sense of touch...
and superior parietal lobule
Superior parietal lobule
The superior parietal lobule is bounded in front by the upper part of the postcentral sulcus, but is usually connected with the postcentral gyrus above the end of the sulcus....
. Brodmann-1909 considered it topologically homologous to the combined superior parietal area 7, the supramarginal area 40 (H) and the angular area 39 (H) of the human. Cytoarchitecurally he regarded it as "a still undifferentiated precursor zone for all parietal areas (apart from area 5)" (Garey-1999). Distinctive features (Brodmann-1905): in area 7 compared to Brodmann area 5
Brodmann area 5
Brodmann area 5 is one of Brodmann's cytologically defined regions of the brain. It is involved in somatosensory processing and association.-Human:Brodmann area 5 is part of the parietal cortex in the human brain...
-1909, large ganglion cell
Ganglion cell
A retinal ganglion cell is a type of neuron located near the inner surface of the retina of the eye. It receives visual information from photoreceptors via two intermediate neuron types: bipolar cells and amacrine cells...
s are absent from the internal pyramidal layer (V); the pyramidal cell
Pyramidal cell
Pyramidal neurons are a type of neuron found in areas of the brain including cerebral cortex, the hippocampus, and in the amygdala. Pyramidal neurons are the primary excitation units of the mammalian prefrontal cortex and the corticospinal tract. Pyramidal neurons were first discovered and...
s of the external pyramidal layer (III) sublayer 3b are, on average, larger; the multiform layer (VI) is denser and narrower and more sharply bounded by subcortical white matter
White matter
White matter is one of the two components of the central nervous system and consists mostly of myelinated axons. White matter tissue of the freshly cut brain appears pinkish white to the naked eye because myelin is composed largely of lipid tissue veined with capillaries. Its white color is due to...
.