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Journal of Experimental Biology 43,181-184 (1965)
Published by Company of Biologists 1965

Automatic Activity of the Locomotor Centres of the Lumbar Cord in Lizards

J. TEN CATE ¹

¹ Physiological Laboratory, University of Amsterdam

1. The motor centres of the isolated lumbar cord of lizards can co-ordinate the alternating movements of the hind limbs and also maintain them completely autonomously for a short time.

2. The rhythm of the alternating movements of the hind limbs studied in spinal lizards placed on a carriage is slower than when walking with both pairs of limbs.

3. Stimuli applied to the skin of the hind part of the body have no influence on the rhythm of walking in spinal lizards, in contrast to birds.

4. When walking with both pairs of limbs under normal conditions the rhythm of locomotion is initiated by the motor centres of the front limbs and is transmitted to the centres of the hind limbs.