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Activity of the elbow flexor and extensor muscles during contact placing elicited by tactile stimulation of various aspects of the forelimb in the cat

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Czarkowska-Bauch J., Bem T., Majczynski H.

Acta Neurobiologiae Experimentalis

1993

vol. 53

issue 1

125-131

The activity of the biceps brachiit and lateral head of the triceps brachii were compared during the contact placing reactions elicited by tactile stimuli applied to the lateral, medial or dorsal aspects of the forepaw to verify the hypothesis that common movement strategy was used in all these reactions. Similar latencies and patterns of muscle activation have been found for the medial and dorsal placing while the different timing of the muscle activation was seen in lateral placing reactions. Both muscles often coactiveted during lateral or dorsal and less frequently during medial placing reactions. In dorsal placing the coactivations predominated at the beginning of the reactions while in lateral placing they appeared most frequently in later phases of the reaction. The co-contraction of the elbow flexor and extensor muscles leads to locking of the elbow joint. Thus, the coactivation of these muscles in different phases of the lateral, medial and dorsal placing reactions indicates that various movement strategies have been used as the elbow flexion movement is iniatiated in different phases of these reactions.

Hindlimb swing, stance and step relationships during unrestrained walking in cats with lateral funicular lesion

100%

Gorska T., Majczynski H., Bem T., Zmyslowski W.

Acta Neurobiologiae Experimentalis

1993

vol. 53

issue 1

133-142

In freely moving cats, walking at speeds of 0.4-1.0 m/s, lesions of the lateral funiculi, performed at the low thoracic level, increased the hindlimb step cycle duration and changed the relationships between the stance and swing phase durations and the step cycle duration. The values of the slopes of linear regression lines relating the swing and the step durations were markedly increased, while those for the stance phase were decreased, compared to intact animals. Control dorsal column produced no change in these parameters. The results suggest that pathways in the lateral funiculi play a substantial role in maintaining the proper structure of the step cycle.

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2 Acta Neurobiologiae Experimentalis

2 1993

2 Bem T.

2 Majczynski H.

1 Czarkowska-Bauch J.

1 Gorska T.

1 Zmyslowski W.

Search results

Activity of the elbow flexor and extensor muscles during contact placing elicited by tactile stimulation of various aspects of the forelimb in the cat

Hindlimb swing, stance and step relationships during unrestrained walking in cats with lateral funicular lesion