The organization of heterogenic reflexes among muscles crossing the ankle joint in the decerebrate cat.

摘要: 1. Mechanical actions of heterogenic (intermuscular) reflexes arising from proprioceptors in flexor and extensor ankle muscles were measured intercollicular premammillary decerebrate cats. Length inputs applied to the freed tendons one a pair crossing joint resulting changes force both measured. Interactions between autogenic studied by applying length muscles. 2. A consistent asymmetry was observed inhibition single-joint antagonists soleus tibialis anterior (TA). Inhibition TA weak or absent during reflex activation TA. In contrast, strong consistently crossed-extension reflex. The effect this intact is increase apparent mechanical stiffness soleus. 3. Mutual synergism among soleus, medial gastrocnemius (MG) lateral (LG) demonstrated only at low moderate forces observation excitatory them. During naturally electrically evoked reflex, however, unidirectional inhibitory MG LG observed. This increased with LG. These results suggest that knee joints become more tightly linked mechanically high since biarticular muscle predominates over uniarticular 4. Under quiescent conditions (no resting activation), mutual obeyed extensors also pretibial flexors digitorum longus (EDL). Moreover, generally an extensor. Departures expected pattern occurred when groups activated flexion reflexes. Reflexes onto EDL reversed sign magnitude. 5. patterns connectivity similar preparations, although strength sometimes noted cases where second, lower transection performed experiment. 6. It argued large magnitudes certain response properties animal are not dominated intrinsic properties.(ABSTRACT TRUNCATED AT 400 WORDS)