MainMenu Back Next Index

 

WEAKNESS

Decreased limb movements due to weakness—regardless of its degree—will be referred to as paresis, thus avoiding the need to use paresis and plegia to imply different degrees of weakness. Limb weakness implies a neurological deficit. The neurological deficit results from a lesion in the central or peripheral nervous system (Figure 197.1).

Figure 197.1. Schematic representation of the central and peripheral nervous systems involved in patients with weakness. The colored rectangles indicate the location of weakness produced by damage to the different components of the somatic motor system. V: ventricles; T: thalamus; UQ: upper quadrant; FN: facial nerve; LQ: lower quadrant; BP: brachial plexus; LSP: lumbosacral plexus.

 

MainMenu Back Next Index
lumbosacral plexus brachial plexus lower facial quadrant inervation (all cortical fibers are from the opposiste side) facial nerve facial nerve motor facial nerve nucleus upper facial quadrant inervation  (must cerebral cortical fibers are from the same side) thalamus thalamus lateral ventricles lateral ventricles To identify a structure pause the pointer over the abbrevations, or the structure in question; do not click. Not all structures are labeled. Figure must be centered.