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Clinical Anatomy For Dummies. The tissues of the pectoral girdle need oxygen. So a complex series of arteries supplies blood flow through the shoulder, upper arm and chest area. And because the axilla includes several important lymph nodes, that lymph has to flow.
The external carotid artery brings blood to structures outside the skull, primarily the face, and the internal carotid to structures inside the skull, including the brain.The internal carotid is responsible for supplying blood to the nearest brain hemisphere with the help of the basilar artery.The vertebra-basilar system supplies blood when the carotid artery cannot do so (due to a blockage, for example).he external carotid artery brings blood to structures outside the skull, primarily the face, and the internal carotid to structures inside the skull, including the brain.