Junko Akatani

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To gain insight into the neural mechanisms controlling vertebral column movement and its role in walking, we performed kinematic and electromyographic (EMG) studies on cats during level and upslope treadmill walking. Kinematic data of the limbs and vertebral column were obtained with a high-speed camera synchronized with EMG recordings from levels T10, L1,(More)
Electromyographic (EMG) burst patterns of m. longissimus and the kinematics of the vertebral column were assessed in cats during treadmill walking for six downslope grades (5 degrees-30 degrees). The EMG bursts during downslope walking were weak between 5 degrees and 20 degrees. At steeper grades (>20 degrees), EMG bursts were large. Bursts at T10(More)
Previous studies (Wada and Kanda 2001, Exp Brain Res 136:263-263; Wada et al. 1999, Exp Brain Res 128:543-549) demonstrated that input patterns from hindlimb muscles and cutaneous afferents vary among individual trunk muscle motoneurons. The purpose of the present study was to examine the relationship between the synaptic pattern from hindlimb afferents and(More)
We examined the relationship between input resistance and amplitude of monosynaptic and polysynaptic EPSPs produced by electrical stimulation of group I muscle afferents innervating the m. longissimus lumborum (Long) at different levels (L1-L4) in Long motoneurons in L4 spinal segments to obtain an insight into the neuronal control of trunk muscles. In the(More)
The aim of this study was to elucidate the neuronal pathways mediating propriospinal reflexes of the tail with special reference to the intersegmental connections between group I muscle afferents and motoneurons. Experiments were performed on 25 unanesthetized, spinalized (L1) cats of both sexes. The effects of electrical stimulation of the afferents(More)
When falling from an inverted position, EMG activities of tail muscles (the m. extensor caudae lateralis, m. abductor caudae externus, m. flexor caudae longus) and tail movements were recorded in 7 long-tailed adult cats. After being released from an elevated position, cat rotates the tail in a reverse direction to rotation of other parts of the cat's body(More)
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