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Morphology of interneurones mediating Ia reciprocal inhibition of motoneurones in the spinal cord of the cat

Artikel i vetenskaplig tidskrift
Författare Elzbieta Jankowska
Sivert Lindström
Publicerad i The Journal of Physiology
Volym 226
Sidor 805-823
ISSN 00223751
Publiceringsår 1972
Publicerad vid Fysiologiska institutionen
Sidor 805-823
Språk en
Ämneskategorier Medicinska grundvetenskaper

Sammanfattning

1. Interneurones identified by physiological criteria (Hultborn, Jankowska & Lindström, 1971b) to mediate Ia reciprocal inhibition of motoneurones in the spinal cord of the cat were stained by intracellular injection of a fluorescent dye (Procion Yellow). 2. The somas of the stained cells were found in Rexed's lamina VII, just dorsal or dorsomedial to the motor nuclei. Their size was about 30 × 20 μm. The cells had four to five slender, weakly branching dendrites. The total extension of their dendritic trees was about 600 μm dorsoventrally, 400 μm mediolaterally and 300 μm rostrocaudally. 3. The axons originated from a separate axon hillock or from the base of a dendrite. They were myelinated with external diameter of about 6–14 μm and projected to either the ipsilateral ventral or lateral funiculi. Early collaterals were found only exceptionally. Some axons bifurcated into an ascending and a descending branch within the funiculi. 4. The possibility of identifying the Ia inhibitory interneurones on purely morphological grounds is discussed. © 1972 The Physiological Society

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