The brachial plexus is formed by four or five of the lowest cervical nerves; the last nerve of this plexus often marks the boundary of the cervical and thoracic vertebrae. [Please select]
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The brachial artery and median nerve pass through the foramen. [Please select]
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This species resembles the _Psilopi_ in the structure of the præbrachial vein. [Please select]
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Wings rather long; discal transverse vein straight, upright, parted by hardly half its length from the border, and by rather more than its length from the præbrachial transverse. [Please select]
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Wings long, narrow; discal transverse vein straight, upright, parted by less than half its length from the border, and by nearly twice its length from the præbrachial transverse. [Please select]
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