[Durgical](https://durgical.com/en/) › [DurgiPedia](https://durgical.com/en/durgipedia/) › [Anatomy](https://durgical.com/en/anatomy/) › [Head and neck](https://durgical.com/en/anatomy/region/head-and-neck/) › Middle cerebral artery [Cardiovascular system](https://durgical.com/en/anatomy/system/cardiovascular-system/) · [Head and neck](https://durgical.com/en/anatomy/region/head-and-neck/) # Middle cerebral artery The middle cerebral artery feeds the outer side of the brain, including face, arm and language areas; it is the artery most often blocked in stroke. [See in 3D →](https://durgical.app/?from=durgipedia&lang=en#region=head_neck&select=middle_cerebral_artery&side=r) Opens in the Durgical app, no sign-up needed. ## What it is The largest branch of the internal carotid, running out in the lateral sulcus over the side of the brain. ## What it does Feeds the face, arm and language areas; the most common site of major strokes. ## Key points - Stroke: weakness and numbness of the opposite face and arm more than the leg, with the eyes turned toward the side of the lesion - Dominant hemisphere (usually left): aphasia, Broca (non-fluent) with the superior division, Wernicke (fluent, poor comprehension) with the inferior; non-dominant: neglect of the opposite side - Its lenticulostriate branches are small end arteries: lacunar infarcts and hypertensive bleeds in the basal ganglia and internal capsule; the largest lateral one is the classic "artery of cerebral haemorrhage" (Charcot) ## Key facts **Origin** Internal carotid (largest branch) **Branches** Lenticulostriate (to basal ganglia, internal capsule); superior and inferior divisions over the lateral surface **Supplies** Lateral hemisphere incl. insula, lateral orbital surface and temporal pole: face and arm motor/sensory areas, language (dominant side), optic radiation; deep: [putamen](https://durgical.com/en/anatomy/putamen/), external pallidum, most of the caudate, upper internal capsule ## Relations **Course** From the end of the internal carotid it runs laterally in the lateral (Sylvian) sulcus (M1), divides near the limen insulae, runs over the [insula](https://durgical.com/en/anatomy/insula/) (M2), turns out between the opercula (M3) and spreads over the lateral surface of the hemisphere (M4) **Deep** Insula; its lenticulostriate branches climb through the anterior perforated substance to the basal ganglia and internal capsule **Superficial** Frontal, parietal and temporal opercula, which close over it in the [lateral sulcus](https://durgical.com/en/anatomy/lateral-sulcus/) ## How to find it It cannot be felt. M1 runs laterally from the internal carotid under the anterior perforated substance, then the branches climb through the lateral (Sylvian) fissure over the insula; transcranial Doppler finds it through the thin [temporal bone](https://durgical.com/en/anatomy/temporal-bone/) above the zygomatic arch, and serial readings are used to watch for vasospasm. ## Examination - Pronator drift: arms held out, palms up, eyes closed; the weak arm drifts down and turns in - Language: fluency, naming, repetition and comprehension separate Broca from Wernicke aphasia - Neglect: line bisection, copying a clock face, or extinction when both sides are touched at once ## On imaging Non-contrast CT may show a hyperdense MCA sign (clot in M1) and early loss of the insular ribbon; the ASPECTS score grades early change across the territory; CT angiography looks for a large vessel occlusion. ## Common problems - Ischaemic stroke from a clot: sudden weakness or numbness of the face and arm on one side, trouble speaking. - Every minute counts: brain cells die quickly without blood. ## How it is diagnosed Emergency CT or MRI and CT angiography to find the blocked artery. ## Treatment - Clot-dissolving medicine within the first hours. - Removing the clot with a catheter (thrombectomy) for large-artery strokes. - Rehabilitation and prevention (blood pressure, cholesterol, antiplatelets, quitting smoking). ## Clinical notes - Stroke care is time-critical: imaging decides whether clot-dissolving treatment (thrombolysis) or clot retrieval by catheter (thrombectomy) can help - Large infarcts can swell over the first days ('malignant' MCA infarction) and cause herniation; decompressive hemicraniectomy is an option - Homonymous hemianopia appears when the optic radiation in the temporal or [parietal lobe](https://durgical.com/en/anatomy/superior-parietal-lobule/) is involved ## Anatomical variants - M1 divides into two trunks in most people and into three (trifurcation) in a minority - An accessory or duplicated middle cerebral artery, arising from the anterior cerebral or [internal carotid artery](https://durgical.com/en/anatomy/internal-carotid-artery/), is uncommon ## Memory aid Stroke recognition: FAST (Face drooping, Arm weakness, Speech difficulty, Time to call for emergency help). ## Related conditions - [Ischaemic stroke](https://durgical.com/en/conditions/ischaemic-stroke/) - [Transient ischaemic attack](https://durgical.com/en/conditions/transient-ischaemic-attack/) - [Arterial hypertension](https://durgical.com/en/conditions/arterial-hypertension/) - [Vascular dementia](https://durgical.com/en/conditions/vascular-dementia/) - [Brain arteriovenous malformation](https://durgical.com/en/conditions/brain-arteriovenous-malformation/) - [Primary angiitis of the central nervous system](https://durgical.com/en/conditions/primary-angiitis-of-the-central-nervous-system/) ## Test yourself Think of the answer, then tap the question to see it. ## What is the typical deficit of a middle cerebral artery stroke? Weakness and numbness of the opposite face and arm more than the leg, with the eyes turned toward the side of the lesion. ## Which aphasias follow strokes of the divisions of the dominant middle cerebral artery? Superior division: Broca (non-fluent) aphasia. Inferior division: Wernicke (fluent, poor comprehension) aphasia. ## Which branches of the middle cerebral artery cause lacunar infarcts and hypertensive bleeds? The lenticulostriate arteries, small end arteries to the basal ganglia and internal capsule. ## What is a malignant middle cerebral artery infarction? A large infarct that swells over the first days and can cause herniation; decompressive hemicraniectomy is an option. [Add to my cards (4)](https://durgical.app/estudiar/?add=/en/anatomy/middle-cerebral-artery/) Educational information, not medical advice. For any symptom, see a health professional. ## Its names **Official Latin (TA2)** arteria media cerebri TA2 4509 **Official Spanish (DeCS)** Arteria Cerebral Media DeCS D020768 **English (TA2)** Middle cerebral artery **Also called** sylvian artery ## Related - [Lateral sulcus](https://durgical.com/en/anatomy/lateral-sulcus/) - [Motor cortex](https://durgical.com/en/anatomy/precentral-gyrus/) - [Sensory cortex](https://durgical.com/en/anatomy/postcentral-gyrus/) - [Broca's area](https://durgical.com/en/anatomy/opercular-part-of-inferior-frontal-gyrus/) - [Wernicke's area](https://durgical.com/en/anatomy/superior-temporal-gyrus/) - [Insula](https://durgical.com/en/anatomy/insula/) - [Putamen](https://durgical.com/en/anatomy/putamen/) - [Frontal lobe](https://durgical.com/en/anatomy/superior-frontal-gyrus/) Sources: Terminologia Anatomica (TA2); [DeCS](https://decs.bvsalud.org/es/ths/resource/?id=34044); [Neuroanatomy, Middle Cerebral Artery](https://www.ncbi.nlm.nih.gov/books/NBK526002/); Anatomía humana (4.ª ed.), tomo 1, cap. 26: Vascularización del encéfalo. ## **Spotted a mistake?** We are always improving for the community. Tell us what is wrong and our team will review it. Report a mistake Representative model, for educational purposes only. --- Source: https://durgical.com/en/anatomy/middle-cerebral-artery/ License: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Cite as: DurgiPedia (durgical.com), https://durgical.com/en/anatomy/middle-cerebral-artery/