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Primary Somatosenory Cortex

  • The image descriptionprimary somatosensory cortex (SI) is located just posterior to the central sulcus in the postcentral gyrus of the parietal lobe (Broadmann areas 3, 1, and 2).
An image showing lateral view of the right hemisphere and medial view of the left hemisphere
An image showing lateral view of the right hemisphere and medial view of the left hemisphere, the Primary Somatosenory Cortex is highlighted
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  • Using tactile stimuli from the skin, the somatosensory cortex produces sensations of touch, pressure, pain, temperature, and proprioception (or the somesthetic sensations), which it then localizes to specific body regions.
  • This area also assesses the size, shape, and texture of objects based on┬átheir feel and helps judge body position (proprioception) using sensory input from the joints, muscles, and skin.
  • Similar to the motor cortex, the primary somatosensory cortex is somatotopically organizated (or functionally organized by body region).
  • The image descriptionmedial and superior portions of the cortex image sensations from the genitals, feet, legs, hips, trunk, head and arm regions.
An image showing Lateral view of the right hemisphere and Coronal view of the right hemisphere, the Primary Somatosenory Cortex is highlighted
An image showing the genitals, feet, legs, hips, trunk, head and arm sensation regions, Lateral view of the right hemisphere and Coronal view of the right hemisphere, the Primary Somatosenory Cortex is highlighted
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  • The image descriptionlateral portions of the cortex image sensations from the hands, face, teeth, tongue, pharynx and intraabdominal regions.
An image showing the genitals, feet, legs, hips, trunk, head and arm sensation regions, Lateral view of the right hemisphere and Coronal view of the right hemisphere, the Primary Somatosenory Cortex is highlighted
An image showing the genitals, feet, legs, hips, trunk, head and arm sensation regions, Lateral view of the right hemisphere and Coronal view of the right hemisphere, the Primary Somatosenory Cortex is highlighted
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  • Each somatosensory cortex receives sensory input from the opposite side of the body.
  • Neurons that carry information about image descriptiontouch cross over in medulla oblongata portion of the brain stem.
An image showing the stimulation of the skin generating action potential in the 1st sensory neuron of the touch pathway
An image showing the stimulation of the skin generating action potential in the 1st sensory neuron of the touch pathway
An image showing the stimulation of the skin generating action potential in the 1st sensory neuron of the touch pathway
An image showing the stimulation of the skin generating action potential in the 1st sensory neuron of the touch pathway
An image showing the stimulation of the skin generating action potential in the 1st sensory neuron of the touch pathway
An image showing the stimulation of the skin generating action potential in the 1st sensory neuron of the touch pathway
An image showing the stimulation of the skin generating action potential in the 1st sensory neuron of the touch pathway
An image showing the stimulation of the skin generating action potential in the 1st sensory neuron of the touch pathway
An image showing the stimulation of the skin generating action potential in the 1st sensory neuron of the touch pathway
An image showing the action potential moving through the first sensory neuron, from the receptor to the spinal cord, part of the touch pathway
An image showing the action potential moving through the first sensory neuron, from the receptor to the spinal cord, part of the touch pathway
An image showing the action potential moving through the first sensory neuron, from the receptor to the spinal cord, part of the touch pathway
An image showing the action potential moving through the first sensory neuron, from the receptor to the spinal cord, part of the touch pathway
An image showing the action potential moving through the first sensory neuron, from the receptor to the spinal cord, part of the touch pathway
An image showing the action potential moving through the first sensory neuron, from the receptor to the spinal cord, part of the touch pathway
An image showing the action potential moving through the first sensory neuron, from the receptor to the spinal cord, part of the touch pathway
An image showing the action potential moving through the first sensory neuron, from the receptor to the spinal cord, part of the touch pathway
An image showing the action potential moving through the first sensory neuron, from the receptor to the spinal cord, part of the touch pathway
An image showing the action potential moving through the first sensory neuron, from the receptor to the spinal cord, part of the touch pathway
An image showing the action potential moving through the second sensory neuron, from the spinal cord to the thalamus passing through medial lemniscus of the medulla, part of the touch pathway
An image showing the action potential moving through the second sensory neuron, from the spinal cord to the thalamus passing through medial lemniscus of the medulla, part of the touch pathway
An image showing the action potential moving through the second sensory neuron, from the spinal cord to the thalamus passing through medial lemniscus of the medulla, part of the touch pathway
An image showing the action potential moving through the second sensory neuron, from the spinal cord to the thalamus passing through medial lemniscus of the medulla, part of the touch pathway
An image showing the action potential moving through the second sensory neuron, from the spinal cord to the thalamus passing through medial lemniscus of the medulla, part of the touch pathway
An image showing the action potential moving through the second sensory neuron, from the spinal cord to the thalamus passing through medial lemniscus of the medulla, part of the touch pathway
An image showing the action potential moving through the second sensory neuron, from the spinal cord to the thalamus passing through medial lemniscus of the medulla, part of the touch pathway
An image showing the action potential moving through the second sensory neuron, from the spinal cord to the thalamus passing through medial lemniscus of the medulla, part of the touch pathway
An image showing the action potential moving through the second sensory neuron, from the spinal cord to the thalamus passing through medial lemniscus of the medulla, part of the touch pathway
An image showing the action potential moving through the second sensory neuron, from the spinal cord to the thalamus passing through medial lemniscus of the medulla, part of the touch pathway
An image showing the action potential moving through the second sensory neuron, from the spinal cord to the thalamus passing through medial lemniscus of the medulla, part of the touch pathway
An image showing the action potential moving through the second sensory neuron, from the spinal cord to the thalamus passing through medial lemniscus of the medulla, part of the touch pathway
An image showing the action potential moving through the third sensory neuron, from the thalamus to the cerebral cortex, part of the touch pathway
An image showing the action potential moving through the third sensory neuron, from the thalamus to the cerebral cortex, part of the touch pathway
An image showing the action potential moving through the third sensory neuron, from the thalamus to the cerebral cortex, part of the touch pathway
An image showing the action potential moving through the third sensory neuron, from the thalamus to the cerebral cortex, part of the touch pathway
An image showing the action potential moving through the third sensory neuron, from the thalamus to the cerebral cortex, part of the touch pathway
An image showing the action potential moving through the third sensory neuron, from the thalamus to the cerebral cortex, part of the touch pathway
An image showing the action potential moving through the third sensory neuron, from the thalamus to the cerebral cortex, part of the touch pathway
  • Neurons that carry information about image descriptiontemperature and pain cross over in the spinal cord, near their point of entry.
An image showing stimulation of the somatic sensory nervous system by sharp object
An image showing stimulation of the somatic sensory nervous system by sharp object
An image showing stimulation of the somatic sensory nervous system by sharp object
An image showing stimulation of the somatic sensory nervous system by sharp object
An image showing stimulation of the somatic sensory nervous system by sharp object
An image showing stimulation of the somatic sensory nervous system by sharp object
An image showing the action potential moving through the first sensory neuron of the somatic nervous system
An image showing the action potential moving through the first sensory neuron of the somatic nervous system
An image showing the action potential moving through the first sensory neuron of the somatic nervous system
An image showing the action potential moving through the first sensory neuron of the somatic nervous system
An image showing the action potential moving through the first sensory neuron of the somatic nervous system
An image showing the action potential moving through the first sensory neuron of the somatic nervous system
An image showing the action potential moving through the first sensory neuron of the somatic nervous system
An image showing the action potential moving through the first sensory neuron of the somatic nervous system
An image showing the action potential moving through the first sensory neuron of the somatic nervous system
An image showing the action potential moving through the first sensory neuron of the somatic nervous system
An image showing the action potential moving through the first sensory neuron of the somatic nervous system
An image showing the action potential moving through the first sensory neuron of the somatic nervous system
An image showing the action potential moving through the first sensory neuron of the somatic nervous system
An image showing the action potential moving through the second and third sensory neurons of the somatic nervous system pathway
An image showing the action potential moving through the second and third sensory neurons of the somatic nervous system pathway
An image showing the action potential moving through the second and third sensory neurons of the somatic nervous system pathway
An image showing the action potential moving through the second and third sensory neurons of the somatic nervous system pathway
An image showing the action potential moving through the second and third sensory neurons of the somatic nervous system pathway
An image showing the action potential moving through the second and third sensory neurons of the somatic nervous system pathway
An image showing the action potential moving through the second and third sensory neurons of the somatic nervous system pathway
An image showing the action potential moving through the second and third sensory neurons of the somatic nervous system pathway
An image showing the action potential moving through the second and third sensory neurons of the somatic nervous system pathway
An image showing the action potential moving through the second and third sensory neurons of the somatic nervous system pathway
An image showing the action potential moving through the second and third sensory neurons of the somatic nervous system pathway
An image showing the action potential moving through the second and third sensory neurons of the somatic nervous system pathway
An image showing the action potential moving through the second and third sensory neurons of the somatic nervous system pathway
  • If this area is damaged, an individual may ignore certain body regions (or neglect syndrome) or not be able to recognize objects from their feel (or agnosia).