It is located distally to the vertebral artery and proximally to the costocervical trunk. Electrodes may be placed distally or proximally on the limb without affecting the recording. It is largest proximally and tapers to the distal end. The neurovascular bundle which supplies the distal component is reserved and transferred proximally. It is proximally based at the distal edge of the thumb-index web. Two lateral ungual spines project proximally from the apical tuft. More proximally is a protrusion which appears to be a sixth "finger". This incision may be extended proximally in order to adequately expose the abductor digiti minimi. The leaves occur densely to rather distantly, and bracts are present proximally. It extends proximally toward the cell nucleus. The clavicle is loop-shaped proximally. Almost all intussusceptions occur with the intussusceptum having been located proximally to the intussuscipiens.