Universität zu Köln

Zill, Sasha N., Chaudhry, Sumaiya, Bueschges, Ansgar and Schmitz, Josef (2013). Directional specificity and encoding of muscle forces and loads by stick insect tibial campaniform sensilla, including receptors with round cuticular caps. Arthropod Struct. Dev., 42 (6). S. 455 - 468. OXFORD: ELSEVIER SCI LTD. ISSN 1873-5495

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Abstract

In many systems, loads are detected as the resistance to muscle contractions. We studied responses to loads and muscle forces in stick insect tibial campaniform sensilla, including a subgroup of receptors (Group 6B) with unusual round cuticular caps in oval-shaped collars. Loads were applied in different directions and muscle contractions were emulated by applying forces to the tibial flexor muscle tendon (apodeme). All sensilla 1) were maximally sensitive to loads applied in the plane of joint movement and 2) encoded muscle forces but did not discharge to unresisted movements. Identification of 6B sensilla by stimulation of cuticular caps demonstrated that receptor responses were correlated with their morphology. Sensilla with small cuticular collars produced small extracellular potentials, had low thresholds and strong tonic sensitivities that saturated at moderate levels. These receptors could effectively signal sustained loads. The largest spikes, derived from sensilla with large cuticular collars, had strong dynamic sensitivities and signaled a wide range of muscle forces and loads. Tibial sensilla are apparently tuned to produce no responses to inertial forces, as occur in the swing phase of walking. This conclusion is supported by tests in which animals 'stepped' on a compliant surface and sensory discharges only occurred in stance. (C) 2013 Elsevier Ltd. All rights reserved.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Zill, Sasha N. UNSPECIFIED UNSPECIFIED UNSPECIFIED Chaudhry, Sumaiya UNSPECIFIED UNSPECIFIED UNSPECIFIED Bueschges, Ansgar UNSPECIFIED UNSPECIFIED UNSPECIFIED Schmitz, Josef UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-473270
DOI:	10.1016/j.asd.2013.10.001
Journal or Publication Title:	Arthropod Struct. Dev.
Volume:	42
Number:	6
Page Range:	S. 455 - 468
Date:	2013
Publisher:	ELSEVIER SCI LTD
Place of Publication:	OXFORD
ISSN:	1873-5495
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language MEDIAL GASTROCNEMIUS-MUSCLE; BODY LOAD; SENSORY SIGNALS; WALKING INSECT; LEG; COCKROACH; RESPONSES; POSTURE; STRAIN; MOVEMENT Multiple languages Entomology Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/47327