Synaptic organization of sensory and motor neurones innervating triceps brachii muscles in the bullfrog

The Journal of Physiology
E Frank, M Westerfield

Abstract

1. The anatomy and physiology of sensory-motor pathways were studied in the brachial spinal cord of adult bullfrogs to characterize the properties and specificity of these connexions.2. Motoneurones innervating a given forelimb muscle are located in discrete and reproducible regions of the lateral motor column. Yet only a fraction of the motoneurones in a particular region innervates any one muscle.3. The central projections of sensory afferent axons from the triceps muscles extend throughout the rostro-caudal length of the brachial spinal cord. Within this region these projections terminate in an area containing many motoneuronal dendrites.4. Within the triceps motor pool sensory neurones from the triceps muscles produce monosynaptic potentials only in triceps motoneurones even though these motoneurones are mingled with motoneurones innervating other muscles.5. Motoneurones innervating each of the three heads of the triceps muscles, medial, internal and external, receive monosynaptic input from their own, homonymous muscle head. Sensory fibres from the medial head also innervate 98% of the heteronymous motoneurones projecting to the internal or external heads, and nearly 90% of the medial triceps motoneurones are innervated by...Continue Reading

Citations

Jan 1, 1984·Biological cybernetics·B W FeenstraJ J Van Leeuwen
May 26, 1995·Brain Research. Developmental Brain Research·M J CroweM S Beattie
Oct 1, 1996·International Journal of Developmental Neuroscience : the Official Journal of the International Society for Developmental Neuroscience·S C Mears, E Frank
Nov 1, 1983·Brain Research·M Westerfield, S L Powell
May 1, 1993·Neuron·E Frank, P Wenner
Sep 1, 1984·The Journal of Comparative Neurology·T J Ruigrok, A Crowe
Sep 1, 1991·Anatomia, histologia, embryologia·J W SharpR L Kitchell
Mar 1, 1988·The Journal of Comparative Neurology·C L Smith, E Frank
Feb 15, 1986·The Journal of Comparative Neurology·N FritzP Saggau
Dec 1, 1992·Neuroscience Research·F MurakamiH Katsumaru

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