Brachial Plexus Injuries in Adults [an issue of Hand by A. Bishop, et al.,

By A. Bishop, et al.,

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12). Fibrolipomatous hamartoma is a very rare, benign, infiltrating condition involving peripheral nerves, most commonly the median and sciatic nerves. A single case has been reported in the brachial plexus [32]. MRI Fig. 12. Sagittal (A) and axial (B) T2-weighted images of the brachial plexus in a 12-year-old girl with hand weakness. There is fusiform enlargement (arrow) of the middle trunk. Biopsy showed a perineurinoma. 36 AMRAMI & PORT of this entity has a characteristic appearance, with fusiform enlargement of the nerve with fatty proliferation within the nerve itself.

Brachial plexus injury: a survey of incidence and referral pattern. J Hand Surg [Br] 1992;17(1):86–8. [6] Gasparotti R, Ferraresi S, Pinelli L, et al. Threedimensional MR myelography of traumatic injuries of the brachial plexus. AJNR Am J Neuroradiol 1997;18(9):1733–42. [7] Miller R. Observations upon the arrangement of the axillary and brachial plexus. Am J Anat 1939;64:143. [8] Kerr A. Brachial plexus of nerves in man. The variations in its formation and branches. Am J Anat 1918; 23:285–395. [9] Sherman WL, Hays AP, Lange DJ, Latov N, Trojaborg W, Younger DS.

Reduced recruitment is the hallmark of lower motor neuron or PNS weakness and is differentiated from poor activation, which occurs in weakness of central nervous system origin (or is from poor effort caused by pain, hysteria, or malingering). Reduced MUP recruitment is present as soon as weakness of lower motor neurons develops. There is no time delay. After 10 to 21 days, denervated muscle fibers begin to discharge under the influence of their intrinsic pacemaker (fibrillation potentials), and MUP begin to become polyphasic and enlarge (increase in duration and amplitude).

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