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Effect of unilateral somatosensory cortex lesion upon locomotion in dogs

100%
Blaszczyk J. W., Dobrzecka C.
Acta Neurobiologiae Experimentalis
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1995
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vol. 55
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issue 2
133-140
EN
Locomotive limb movements were studied in 6 dogs before and after unilateral primary somatosensory cortex (SI)lesion. Single limb movement parameters as well as interlimb coordination in lesioned dogs differed significantly from the parameters measured before surgery.Both left limbs showed a proprioceptive deficit and were more flexed during normal posture and during locomotion.This resulted in prolonged stance in the left fore and in the right hind legs.The symptoms were greatly pronounced in the left fore limb compared to a slightly impaired left hindlimb. Due to the proprioceptive deficit, the dogs did not have satisfactory control over the position of the distal part of the front limb which caused frequent stumbling and even falling. The symptoms were transient and fully compensated after 3-4 weeks.
2
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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
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1993
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vol. 53
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issue 1
133-142
EN
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.
3
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Different forms of impairment of the fore-hindlimb coordination after partial spinal lesions in cats

100%
Gorska T., Bem T., Majczynski H., Zmyslowski W.
Acta Neurobiologiae Experimentalis
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1996
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vol. 56
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issue 1
177-188
EN
Effects of large low thoracic (T10-T11) partial spinal lesions involving either the ventral quadrans of the spinal cord and, to a different extent the dorsolateral funiculi, or different extent of the lateral funiculi and/or the dorsal columns, on the fore-hindlimb coordination were examined in cats walking overground at moderate speeds. In both groups of operated cats, except those in which the lesion was essentialy confined to dorsal columns, three different forms of impairment of fore-hindlimb coordination were observed, depending on the extent of lesion: (1) a change of locomotion towards pacing with preservation of the equality of the rhythms in the fore- and the hindlimbs; (2) episodes of fore- and hindlimb rhythm dissociation and (3) a permament dissociation of the fore- and hindlimb rhythms. A comparison of the results obtained in these two groups operated cats points to the more important role played by lateral funiculi, then by other parts of the spinal white matter, in controlling the fore-hindlimb coordination in cats.
4
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The effect of naloxone on object exploration, object recognition and other types of spontaneous behavior

88%
Lukaszewska I., Klepaczewska A.
Acta Neurobiologiae Experimentalis
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1997
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vol. 57
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issue 2
123-133
EN
Object exploration was examined in naloxone injected (1 mg/kg or 4 mg/kg) and saline control rats. Naloxone rats explored an object for a shorter time than did controls, thus indicating a lower investigatory motivation. This effect was dose dependent. Higher drug dose (4 mg/kg) decreased the number of contacts with an object. Both doses increased the mean duration of contacts with an object. The naloxone groups showed intact recognition of a familiar object paired with a new one in two sessions 4 h and 24 h after the injections. The higher drug dose depressed the locomotor activity and wall leaning. Grooming was not influenced by naloxone. The normal daily fluctuations in the level of grooming and locomotion were distorted following the injection of the higher dose of naloxone. The lower dose (1 mg/kg) did not affect the rats' performance in some tests. The results could be viewed as a naloxone related depression of the behavior containing motor elements like locomotion, wall leaning and object approaching. The prolonged contact time with an object could be the result of a lowered flexibility of movement. However, the decrease of rewarding value of exploration could not be ruled out. Possibly, naloxone exerts several different interacting behavioral effects.
5
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Hindlimb muscle activity during unrestrained walking in cats with lesions of the lateral funiculi

75%
Zmyslowski W., Gorska T., Majczynski H., Bem T.
Acta Neurobiologiae Experimentalis
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1993
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vol. 53
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issue 1
143-153
EN
In freely moving intact cats and cats with bilateral lesions of the lateral funicull the foot contact signals and the activity of selected muscles operating at the ankle and knee joints were analysed during walking at moderate speed (0.4-1.0 m/s). No essential changes in the activity of the muscles gastrocnemius lateralis (GL), semitendinosus (ST) and vastus lateralis (VL) were found in operated animals. The tibialis anterior (TA) muscle activity had a shorter duration than the swing phase in operated animals and showed an impaired coactivation with gastrocnemius lateralis (GL) muscle at the end of the swing phase.Pilot experiments indicated that these deficits may be partly compensated for by peroneal nerve electrostimulation. Analysis of regression lines relating the swing duration to the step duration, determined from EMG records, confirmed our previous results, based on foot contact signals (Gorska et al. 1993), showing that in cats with lateral funicular lesions the swing duration varies muchmore with the step duration than in intact animals.
6
Content available remote

Respiratory response to stimulation of spinal or medullary locomotor structures in decerebrate cats

75%
Romaniuk J. R., Kasicki S., Kazennikov O., Selionov V. A.
Acta Neurobiologiae Experimentalis
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1994
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vol. 54
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issue 1
11-17
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