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Fig. 7 | Frontiers in Zoology

Fig. 7

From: Does the frontal sensory organ in adults of the hoplonemertean Quasitetrastemma stimpsoni originate from the larval apical organ?

Fig. 7

Transmission electron micrographs of the epidermis in adult worms of Quasitetrastemma stimpsoni. a Ducts of the mucoid (asterisks), granular (black arrowheads), and bacillary type II (white arrowhead) glandular cells. b Secretory extensions of bacillary type I cells (white asterisks) and granular cells (arrowheads) extend through a pore in the extracellular matrix (ecm). c Panoramic view shows the dorsal epidermis near the apical pit with two groups of sensory cells (asterisks). d Group of sensory cells (asterisks). e Axons (asterisks) of sensory cells extend through pores in the subepithelial extracellular matrix (ecm). f Subepithelial nerve tract. Abbreviations: ecm –extracellular matrix; nt–nerve tract

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