Pediculus humanus A. dorsal view of left
antenna. a, peg organs with rounded tips, b, peg organs with
sharp tips; c, tuft organs; d, tactile hairs; e, scolopidial
organs.
B, detail of tactile hair, f, trichogen cell, tormogen cell; h, sense cell.
C, detail of tuft organ.
D, detail of peg organs. i, sense cells; k, nerve.
(Wigglesworth, 1941.)