Postcentral gyrus - wikipedia Postcentral gyrus Postcentral gyrus Postcentral gyrus of the human brain Brodmann areas 3, 1 and 2 of human brain. Brodmann area 3 is in red, area 1 in green, and area 2 in yellow. Details Identifiers Latin Gyrus postcentralis NeuroNames 105 NeuroLex ID birnlex_1070 TA A14. 1.09. 128 FMA 61896 Anatomical terms of neuroanatomy ( edit on Wikidata ) The postcentral gyrus is a prominent gyrus in the lateral parietal lobe of the human brain. It is the location of the primary somatosensory cortex, the main sensory receptive area for the sense of touch. Like other sensory areas, there is a map of sensory space in this location, called the sensory homunculus. The primary somatosensory cortex was initially defined from surface stimulation studies of Wilder Penfield, and parallel surface potential studies of Bard, Woolsey, and Marshall. Although initially defined to be roughly the same as Brodmann areas 3, 1 and 2, more recent work by Kaas has suggested that for homogeny with other sensory fields only area 3 should be referred to as `` primary somatosensory cortex '', as it receives the bulk of the thalamocortical projections from the sensory input fields. Contents 1 Structure 2 See also 3 Additional images 4 External links Structure The lateral postcentral gyrus is bounded by : medial longitudinal fissure medially ( to the middle ) central sulcus rostrally ( in front ) postcentral sulcus caudally ( in back ) lateral sulcus inferiorly ( underneath ) The postcentral gyrus includes Brodmann areas 1, 2, and 3. Brodmann area 1 occupies the apex of the postcentral gyrus. See also List of regions in the human brain Additional images Postcentral gyrus ( animation ) Lateral surface of left cerebral hemisphere, viewed from the side. Drawing to illustrate the relations of the brain to the skull. Sensory homunculus of the human brain. Lateral view of a human brain, main gyri labeled. Cerebrum. Lateral view. Deep dissection. Cerebrum. Lateral view. Deep dissection. Cerebrum. Lateral view. Deep dissection. Primary cortici, including primary somatosensory cortex ( labeled in purple ) External links Wikimedia Commons has media related to Postcentral gyrus. ancil - 1040 at NeuroNames - area 1 ancil - 1041 at NeuroNames - area 2 ancil - 1042 at NeuroNames - area 3 Anatomy of the cerebral cortex of the human brain Frontal lobe Superolateral Prefrontal Superior frontal gyrus 6 8 Middle frontal gyrus 9 10 46 Inferior frontal gyrus : 11 47 - Pars orbitalis Broca 's area 44 - Pars opercularis 45 - Pars triangularis Superior frontal sulcus Inferior frontal sulcus Precentral Precentral gyrus Precentral sulcus Medial / inferior Prefrontal Superior frontal gyrus 6 Medial frontal gyrus 8 9 Paraterminal gyrus / Paraolfactory area 12 Straight gyrus 11 Orbital gyri / Orbitofrontal cortex 10 11 12 Ventromedial prefrontal cortex 10 Subcallosal area 25 Olfactory sulcus Orbital sulcus Precentral Paracentral lobule Paracentral sulcus Both Primary motor cortex Premotor cortex 6 Supplementary motor area 6 Supplementary eye field 6 Frontal eye fields 8 Parietal lobe Superolateral Superior parietal lobule 5 7 Inferior parietal lobule 40 - Supramarginal gyrus 39 - Angular gyrus Parietal operculum 43 Intraparietal sulcus Medial / inferior Paracentral lobule 5 Precuneus 7 Marginal sulcus Both Postcentral gyrus / Primary somatosensory cortex Secondary somatosensory cortex 5 Posterior parietal cortex 7 Occipital lobe Superolateral Occipital pole of cerebrum Lateral occipital gyrus 18 19 Lunate sulcus Transverse occipital sulcus Medial / inferior Visual cortex 17 Cuneus Lingual gyrus Calcarine sulcus Temporal lobe Superolateral Transverse temporal gyrus / Auditory cortex 41 42 Superior temporal gyrus 38 22 / Wernicke 's area Middle temporal gyrus 21 Superior temporal sulcus Medial / inferior Fusiform gyrus 37 Medial temporal lobe 27 28 34 35 36 Inferior temporal gyrus 20 Inferior temporal sulcus Interlobar sulci / fissures Superolateral Central ( frontal + parietal ) Lateral ( frontal + parietal + temporal ) Parieto - occipital Preoccipital notch Medial / inferior Longitudinal fissure Cingulate ( frontal + cingulate ) Collateral ( temporal + occipital ) Callosal sulcus Limbic lobe Parahippocampal gyrus anterior Entorhinal cortex Perirhinal cortex Postrhinal cortex Posterior parahippocampal gyrus Prepyriform area Cingulate cortex / gyrus Subgenual area 25 Anterior cingulate 24 32 33 Posterior cingulate 23 31 Isthmus of cingulate gyrus : Retrosplenial cortex 26 29 30 Hippocampal formation Hippocampal sulcus Fimbria of hippocampus Dentate gyrus Rhinal sulcus Other Supracallosal gyrus Uncus Amygdala Insular cortex Insular cortex General Operculum Poles of cerebral hemispheres Some categorizations are approximations, and some Brodmann areas span gyri. Brain and spinal cord : neural tracts and fasciculi Sensory / ascending PCML 1 ° : Pacinian corpuscle / Meissner 's corpuscle → Posterior column ( Gracile fasciculus / Cuneate fasciculus ) → Gracile nucleus / Cuneate nucleus 2 ° : → sensory decussation / arcuate fibers ( Posterior external arcuate fibers, Internal arcuate fibers ) → Medial lemniscus / Trigeminal lemniscus → Thalamus ( VPL, VPM ) 3 ° : → Posterior limb of internal capsule → Postcentral gyrus Anterolateral / pain Fast / lateral 1 ° ( Free nerve ending → A delta fiber ) → 2 ° ( Anterior white commissure → Lateral and Anterior Spinothalamic tract → Spinal lemniscus → VPL of Thalamus ) → 3 ° ( Postcentral gyrus ) → 4 ° ( Posterior parietal cortex ) 2 ° ( Spinomesencephalic tract → Superior colliculus of Midbrain tectum ) Slow / medial 1 ° ( Group C nerve fiber → Spinoreticular tract → Reticular formation ) → 2 ° ( MD of Thalamus ) → 3 ° ( Cingulate cortex ) Motor / descending Pyramidal flexion : Primary motor cortex → Posterior limb of internal capsule → Decussation of pyramids → Corticospinal tract ( Lateral, Anterior ) → Neuromuscular junction Extrapyramidal flexion : Primary motor cortex → Genu of internal capsule → Corticobulbar tract → Facial motor nucleus → Facial muscles flexion : Red nucleus → Rubrospinal tract extension : Vestibulocerebellum → Vestibular nuclei → Vestibulospinal tract extension : Vestibulocerebellum → Reticular formation → Reticulospinal tract Midbrain tectum → Tectospinal tract → muscles of neck Basal ganglia direct : 1 ° ( Motor cortex → Striatum ) → 2 ° ( GPi ) → 3 ° ( Lenticular fasciculus / Ansa lenticularis → Thalamic fasciculus → VL of Thalamus ) → 4 ° ( Thalamocortical radiations → Supplementary motor area ) → 5 ° ( Motor cortex ) indirect : 1 ° ( Motor cortex → Striatum ) → 2 ° ( GPe ) → 3 ° ( Subthalamic fasciculus → Subthalamic nucleus ) → 4 ° ( Subthalamic fasciculus → GPi ) → 5 ° ( Lenticular fasciculus / Ansa lenticularis → Thalamic fasciculus → VL of Thalamus ) → 6 ° ( Thalamocortical radiations → Supplementary motor area ) → 7 ° ( Motor cortex ) nigrostriatal pathway : Pars compacta → Striatum Cerebellar Afferent Vestibular nuclei → Vestibulocerebellar tract → ICP → Cerebellum → Granule cell Pontine nuclei → Pontocerebellar fibers → MCP → Deep cerebellar nuclei → Granule cell Inferior olivary nucleus → Olivocerebellar tract → ICP → Hemisphere → Purkinje cell → Deep cerebellar nuclei Efferent Dentate nucleus in Lateral hemisphere / pontocerebellum → SCP → Dentatothalamic tract → Thalamus ( VL ) → Motor cortex Interposed nucleus in Intermediate hemisphere / spinocerebellum → SCP → Reticular formation, or → Cerebellothalamic tract → Red nucleus → Thalamus ( VL ) → Motor cortex Fastigial nucleus in Flocculonodular lobe / vestibulocerebellum → Vestibulocerebellar tract → Vestibular nuclei Bidirectional : Spinocerebellar Unconscious proprioception lower limb → 1 ° ( muscle spindles → DRG ) → 2 ° ( Posterior thoracic nucleus → Dorsal / posterior spinocerebellar tract → ICP → Cerebellar vermis ) upper limb → 1 ° ( muscle spindles → DRG ) → 2 ° ( Accessory cuneate nucleus → Cuneocerebellar tract → ICP → Anterior lobe of cerebellum ) Reflex arc lower limb → 1 ° ( Golgi tendon organ ) → 2 ° ( Ventral / anterior spinocerebellar tract → SCP → Cerebellar vermis ) upper limb → 1 ° ( Golgi tendon organ ) → 2 ° ( Rostral spinocerebellar tract → ICP → Cerebellum ) Retrieved from `` https://en.wikipedia.org/w/index.php?title=Postcentral_gyrus&oldid=825188262 '' Categories : Brodmann areas Somatosensory system Gyri Parietal lobe Hidden categories : Infobox brain using braininfo parameter Talk Contents About Wikipedia Deutsch Español Français Italiano Nederlands 日本 語 Português Română Русский Svenska ไทย Українська Edit links This page was last edited on 12 February 2018, at 00 : 01. 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Question: where is the primary somatosensory area of the cerebral hemisphere found
Answer: postcentral gyrus