segments of middle cerebral artery
- segments of middle cerebral artery
- the four segments into which the middle cerebral artery is divided, M1–M4 in clinical terminology. The M1 segment is the sphenoid part (pars sphenoidalis), the horizontal portion of the vessel from the termination of the internal carotid artery to the point of branching at the limen insulae; M2 is the insular part (pars insularis), the segment running in the lateral cerebral (sylvian) fissure and serving the insular cortex; M3 is the opercular part, the segment emerging from the sylvian fissure, supplying the inner aspects of the opercula, and ending at the lateral surface of the cerebral hemisphere; M4 is the cortical part, the terminal branches supplying the lateral surface of the cerebral hemisphere. The artery usually bifurcates into inferior and superior trunks at the end of the M1 segment, so there are two each of the segments M2–M4, the inferior distributing below the sylvian fissure, and the superior distributing above.
Medical dictionary.
2011.
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cortical part of middle cerebral artery — the fourth segment of the middle cerebral artery (M4 segment), comprising the inferior and superior terminal branches of the vessel (rami terminales inferiores and rami terminales superiores), which supply the lateral surface of the cerebral… … Medical dictionary
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pars sphenoidalis arteriae cerebri mediae — [TA] sphenoid part of middle cerebral artery: collectively, the segment of the middle cerebral artery and the branches from it that supply the internal capsule, thalamus, and corpus striatum (M1 segment); the branches comprise the anterolateral… … Medical dictionary
arteria cerebri media — [TA] middle cerebral artery: the larger terminal branch of the internal carotid artery. It begins as single vessel (sphenoid part or pars sphenoidalis) and branches at the limen insulae, turning posterosuperiorly, usually into inferior terminal… … Medical dictionary
pars insularis arteriae cerebri mediae — [TA] insular part of middle cerebral artery: collectively, the segment of the middle cerebral artery and the branches from it that supply the insula and adjacent areas (M2 segment); the branches comprise the arteriae insulares. See also segments… … Medical dictionary
