Oligosynaptic excitation of motoneurones by impulses in group Ia muscle spindle afferents in the cat

1. Intracellular recording from hind‐limb motoneurones was used to investigate whether di‐ and trisynaptic (oligosynaptic) excitatory post‐synaptic potentials (e.p.s.p.s) are evoked from group Ia muscle spindle afferents in those motoneurones in which such potentials are evoked from Ib tendon organ afferents or entire group I afferents. Ia afferents of triceps surae and plantaris were activated either selectively by single brief stretches of these muscles, or together with Ib afferents by electrical stimuli applied to the nerves.

[1]  D. P. Lloyd.  CONDUCTION AND SYNAPTIC TRANSMISSION OF THE REFLEX RESPONSE TO STRETCH IN SPINAL CATS , 1943 .

[2]  Autogenetic inhibition. , 1950, Electroencephalography and clinical neurophysiology.

[3]  D. P. Lloyd,et al.  Nature and significance of the reflex connections established by large afferent fibers of muscular origin. , 1952, The American journal of physiology.

[4]  J. Eccles,et al.  The convergence of monosynaptic excitatory afferents on to many different species of alpha motoneurones , 1957, The Journal of physiology.

[5]  J. Eccles,et al.  Synaptic actions on motoneurones caused by impulses in Golgi tendon organ afferents , 1957, The Journal of physiology.

[6]  J. Eccles,et al.  Types of neurone in and around the intermediate nucleus of the lumbosacral cord , 1960, The Journal of physiology.

[7]  J. Eccles,et al.  Dorsal root reflexes of muscle Group I afferent fibres , 1961, The Journal of physiology.

[8]  C Guzmán-Flores,et al.  Intracellular recording in extensor motoneurons of spastic cats. , 1969, Experimental neurology.

[9]  E Henneman,et al.  Terminals of single Ia fibers: location, density, and distribution within a pool of 300 homonymous motoneurons. , 1971, Journal of neurophysiology.

[10]  A. Lundberg,et al.  Spatial synaptic distribution of recurrent and group Ia inhibitory systems in cat spinal motoneurones , 1971, The Journal of physiology.

[11]  P. Matthews,et al.  Mammalian muscle receptors and their central actions , 1974 .

[12]  H. Wigström,et al.  Prolonged activation of soleus motoneurones following a conditioning train in soleus Ia afferents — A case for a reverberating loop? , 1975, Neuroscience Letters.

[13]  Monosynaptic excitation of motoneurones from muscle spindle secondary endings of intercostal and triceps surae muscles in the cat. , 1975, The Journal of physiology.

[14]  R. Reinking,et al.  Analysis of muscle receptor connections by spike-triggered averaging. 2. Spindle group II afferents. , 1976, Journal of neurophysiology.

[15]  E K Stauffer,et al.  Analysis of muscle receptor connections by spike-triggered averaging. 1. Spindle primary and tendon organ afferents. , 1976, Journal of neurophysiology.

[16]  A. Lundberg,et al.  Effects of 4-aminopyridine on transmission in excitatory and inhibitory synapses in the spinal cord , 1977, Brain Research.

[17]  A. Lundberg,et al.  Comments on reflex actions evoked by electrical stimulation of group II muscle afferents , 1977, Brain Research.

[18]  E. Schomburg,et al.  The possibility of phase-dependent monosynaptic and polysynaptic la excitation to homonymous motoneurones during fictive locomotion , 1978, Brain Research.

[19]  A. Lundberg,et al.  Role of joint afferents in motor control exemplified by effects on reflex pathways from Ib afferents. , 1978, The Journal of physiology.

[20]  E Jankowska,et al.  Autogenetic inhibition of motoneurones by impulses in group Ia muscle spindle afferents. , 1979, The Journal of physiology.

[21]  Properties of single central Ia afferent fibres projecting to motoneurones. , 1979, The Journal of physiology.

[22]  J. Fleshman,et al.  Properties of single-fiber spindle group II EPSPs in triceps surae motoneurons. , 1980, Journal of neurophysiology.

[23]  Y. Yaari,et al.  Post‐synaptic conductance increase associated with presynaptic inhibition in cat lumbar motoneurones. , 1980, The Journal of physiology.

[24]  E. Jankowska,et al.  Common interneurones in reflex pathways from group 1a and 1b afferents of ankle extensors in the cat. , 1981, The Journal of physiology.

[25]  A. Lundberg,et al.  The rubrospinal tract. II. Facilitation of interneuronal transmission in reflex paths to motoneurones , 1969, Experimental Brain Research.