part_of adult peripheral nervous system adult peripheral sensillum A tissue comprised of one or more sensory neurons and sheatrh cells (thecogen cells) which secrete an amorphous sheath, the scolopale, that surrounds and insulates the neuron cell bodies and their dendrites. Sheath cells are reported to occur in arachnids (Tichy and Barth 1992: Microsc.Res. Tech. 22: 372-391). Thecogen cells have also been confirmed in the tick Amblyomma variegatum by Steullet (1993, Perception of vertebrate volatiles in the tropical bont tick Amblyomma variegatum; dissertation at the University of Neuchatel, Switzerland). TADS:0000296 TADS:0000296 default_namespace