By Charles D. Barnes
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4 2 , 91 — 106. Gottlieb, G. , a n d A g a r w a l , G. C. ( 1 9 8 0 a ) . R e s p o n s e to s u d d e n t o r q u e s a b o u t a n k l e in m a n . I I . P o s t m y o t a t i c r e a c t i o n s . / . Neurophysiol. 4 3 , 8 6 - 1 0 1 . Gottlieb, G. , a n d A g a r w a l , G. C. ( 1 9 8 0 b ) . R e s p o n s e to s u d d e n t o r q u e s a b o u t a n k l e in 26 Gerald L. Gottlieb a n d G y a n C. A g a r w a l m a n . I I I . S u p p r e s s i o n of s t r e t c h - e v o k e d r e s p o n s e s d u r i n g p h a s i c c o n t r a c t i o n .
P e t e r s o n Fig. 1. D i a g r a m m a t i c r e p r e s e n t a t i o n of t h e o r i g i n s of r e t i c u l o s p i n a l tracts a n d t h e i r f u n i c u l a r trajectories. C l o s e d a n d o p e n t r i a n g l e s i n d i c a t e t h e o r i g i n s of t h e r e t i c u l o s p i n a l tracts c o u r s i n g in t h e m e d i a l a n d lateral p a r t of t h e a n t e r i o r f u n i c u l u s , respectively. Closed a n d o p e n circles i n d i c a t e t h e o r i g i n s of t h e r e t i c u l o s p i n a l tracts p a s s i n g in t h e v e n t r a l a n d d o r s a l p a r t s of t h e lateral f u n i c u l u s , respectively.
In addition to its action on hindlimb α motoneurons, the same reticular region produces monosynaptic EPSPs in 7 motoneurons supplying the same muscle groups (Grillner et al, 1969). Reticular action tends, therefore, to produce coactivation of α and y motoneurons. In addition to monosynaptic excitation, stimulation of the reticular formation produces later, polysynaptic EPSPs with a distribution similar to that of the monosynaptic EPSPs (see Fig. 5). Reticular-evoked inhibitory postsynaptic potentials (IPSPs) tend, however, to be especially prevalent in motoneurons innervating extensors of the knee and ankle, a population that receives little reticulospinal excitation (Llinas and Terzuolo, 1964, 1965; Jankowska et al, 1968; Grillner et al, 1971; Peterson et al, 1979).