part_of adult seta adult setal shaft Fig. 5-1, Fig. 5-10, in Biology of Ticks ISBN:0-19-505910-7. TADS:0000550 TADS:0000550 The hair-like body of the seta that extends from the setal socket in the cuticle. Often described as setiform sensilla, theshaft of the seta contains a fluid-filled cavity. The dendrite (s) of the adjacent sensory neuron (s) penetrate into the cavity of the shaft and may send minute branches to pores at the tip or along the margins. The shaft may have a solid cuticle (mechanosensory sensilla) or may have pores. default_namespace