Postcentral gyrus
Updates to Article Attributes
The postcentral gyrus lies in the parietal lobe, posterior to the central sulcus. It is the site of the primary somatosensory cortex. The somatosensory homunculus is the representation of the distribution of the contralateral body parts on the gyrus.
Blood supply
The main blood supply is from the anterior cerebral artery (ACA) and the middle cerebral artery (MCA).
The medial portion of the postcentral gyrus is supplied by the ACA. The convexity of the postcentral gyrus is supplied by the MCA.
Related pathology
Compromise of either the ACA or MCA blood supply can lead to contralateral sensory deficits as part of ACA syndrome.
Practical points
On sagittal images, the thin postcentral gyrus sign 1 can be used to identify the postcentral gyrus. This sign states that the sagittal width of the postcentral gyrus is thinner than the precentral gyrus. Thus, the thin vertical gyrus and sulcus posterior the central sulcus are the postcentral gyrus and sulcus.
-<p>The <strong>postcentral gyrus</strong> lies in the <a href="/articles/parietal-lobe">parietal lobe</a>, posterior to the <a href="/articles/central-sulcus">central sulcus</a>. It is the site of the primary somatosensory cortex. The somatosensory homunculus is the representation of the distribution of the contralateral body parts on the gyrus.</p><h4>Blood supply</h4><p>The main blood supply is from the <a href="/articles/anterior-cerebral-artery">anterior cerebral artery</a> (ACA) and the <a href="/articles/middle-cerebral-artery">middle cerebral artery</a> (MCA).</p><p>The medial portion of the postcentral gyrus is supplied by the ACA. The convexity of the postcentral gyrus is supplied by the MCA.</p><h4>Related pathology</h4><p>Compromise of either the ACA or MCA blood supply can lead to contralateral sensory deficits as part of <a title="Anterior cerebral artery (ACA) infarct" href="/articles/anterior-cerebral-artery-aca-infarct">ACA syndrome</a>.</p><h4>Practical points</h4><p>On sagittal images, the thin <a href="/articles/postcentral-gyrus-sign">postcentral gyrus sign</a> <sup>1</sup> can be used to identify the postcentral gyrus. This sign states that the sagittal width of the postcentral gyrus is thinner than the precentral gyrus. Thus, the thin vertical gyrus and sulcus posterior the <a title="Central sulcus" href="/articles/central-sulcus">central sulcus</a> are the postcentral gyrus and sulcus.</p>- +<p>The <strong>postcentral gyrus</strong> lies in the <a href="/articles/parietal-lobe">parietal lobe</a>, posterior to the <a href="/articles/central-sulcus">central sulcus</a>. It is the site of the primary somatosensory cortex. The somatosensory homunculus is the representation of the distribution of the contralateral body parts on the gyrus.</p><h4>Blood supply</h4><p>The main blood supply is from the <a href="/articles/anterior-cerebral-artery">anterior cerebral artery</a> (ACA) and the <a href="/articles/middle-cerebral-artery">middle cerebral artery</a> (MCA).</p><p>The medial portion of the postcentral gyrus is supplied by the ACA. The convexity of the postcentral gyrus is supplied by the MCA.</p><h4>Related pathology</h4><p>Compromise of either the ACA or MCA blood supply can lead to contralateral sensory deficits as part of <a href="/articles/anterior-cerebral-artery-aca-infarct">ACA syndrome</a>.</p><h4>Practical points</h4><p>On sagittal images, the thin <a href="/articles/postcentral-gyrus-sign">postcentral gyrus sign</a> <sup>1</sup> can be used to identify the postcentral gyrus. This sign states that the sagittal width of the postcentral gyrus is thinner than the precentral gyrus. Thus, the thin vertical gyrus and sulcus posterior the <a href="/articles/central-sulcus">central sulcus</a> are the postcentral gyrus and sulcus.</p>
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