infraclavicular

—The infraclavicular branches are derived from the three cords of the brachial plexus, but the fasciculi of the nerves may be traced through the plexus to the spinal nerves from which they originate.

IX. Neurology. 6b. The Anterior Divisions 1918

The right brachial plexus (infraclavicular portion) in the axillary fossa; viewed from below and in front.

Illustrations. Fig. 809 1918

The upper margin is generally well-marked medially and forms the medial boundary of a triangular depression, the infraclavicular fossa, which separates the Pectoralis major from the Deltoideus; it gradually becomes less marked as it approaches the tendon of insertion and is closely blended with the Deltoideus.

XII. Surface Anatomy and Surface Markings. 11. Surface Anatomy of the Upper Extremity 1918

The coracoid process is situated about 2 cm. below the junction of the intermediate and lateral thirds of the clavicle; it is covered by the anterior border of Deltoideus, and thus lies a little lateral to the infraclavicular fossa or depression which marks the interval between the Pectoralis major and Deltoideus.

XII. Surface Anatomy and Surface Markings. 11. Surface Anatomy of the Upper Extremity 1918

Above, its anterior border presents a slightly curved eminence which forms the lateral boundary of the infraclavicular fossa; below, it is closely united with the Pectoralis major.

XII. Surface Anatomy and Surface Markings. 11. Surface Anatomy of the Upper Extremity 1918

Stage IIIC - T has > 10 axillary N, 1 or more supraclavicular or infraclavicular N, or internal mammary N. Stage IV - Distant metastasis (M)

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809– The right brachial plexus (infraclavicular portion) in the axillary fossa; viewed from below and in front.

IX. Neurology. 6b. The Anterior Divisions 1918