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Figure 1: (A– D): Diagrammatic representation (A) of the anatomy of the brachial plexus, with the musculoskeletal and vascular landmarks indicated by three interrupted lines: A — sagittal plane that intersects the interscalene triangle, B — sagittal plane through the lateral margin of the first rib, and C — sagittal plane of the coracoid process. (m, muscle; n,nerve). Axial (B) and sagittal (C), T1W images of the plexus in the interscalene triangle. The anterior and middle scalene muscles are the boundaries of the interscalene triangle and act as useful radiological landmarks for locating the roots and trunks (arrows) of the brachial plexus that lie within the triangle. (sa: scalenus anterior; sm: scalenus medius.) Oblique coronal T1W image (D) shows the roots (R), trunks (T), divisions (D), and cords (C) of the right brachial plexus. Figure 1A — Reprinted from Neuroimaging Clinics of North America, 14(1), Bowen BC, Pattany PM, Saraf-Lavi E, and Maravilla KR, The brachial plexus: normal anatomy, pathology, and MR imaging, page 27, Copyright 2004. With permission from Elsevier

Figure 1: (A– D): Diagrammatic representation (A) of the anatomy of the brachial plexus, with the musculoskeletal and vascular landmarks indicated by three interrupted lines: A — sagittal plane that intersects the interscalene triangle, B — sagittal plane through the lateral margin of the first rib, and C — sagittal plane of the coracoid process. (m, muscle; n,nerve). Axial (B) and sagittal (C), T1W images of the plexus in the interscalene triangle. The anterior and middle scalene muscles are the boundaries of the interscalene triangle and act as useful radiological landmarks for locating the roots and trunks (arrows) of the brachial plexus that lie within the triangle. (sa: scalenus anterior; sm: scalenus medius.) Oblique coronal T1W image (D) shows the roots (R), trunks (T), divisions (D), and cords (C) of the right brachial plexus. Figure 1A — Reprinted from Neuroimaging Clinics of North America, 14(1), Bowen BC, Pattany PM, Saraf-Lavi E, and Maravilla KR, The brachial plexus: normal anatomy, pathology, and MR imaging, page 27, Copyright 2004. With permission from Elsevier