Proprioception in Limulus

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Abstract
1. Tonic and phasic discharges of impulses may be recorded in the small leg nerve of Limulus from endings sensitive to the position and movement of the femorotibial and other joints. 2. The nerve fibres originate from the large sensory cells described by Stuart (1953). Of those at the femoro-tibial joint, one group of cells lies under the hinge and the endings react tonically to the strains present in the cuticle; some are excited by flexion and some by extension. The other group of cells, lying more internally, have endings in the connective tissue and react phasically only during joint movement. 3. The relationship is discussed between these endings and the lyriform organs of Arachnids and the campaniform sensilla of insects.

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