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Fig. 1 | BMC Evolutionary Biology

Fig. 1

From: Developmental studies provide new insights into the evolution of sense organs in Sabellariidae (Annelida)

Fig. 1

Schematic overview showing a nuchal organ of Nerillidium troglochaetoides (Nerillidae) illustrating the general organiszation of an annelid nuchal organ. The organ consists of ciliated supporting cells (sc) with microvilli and cilia (ci), an olfactory chamber (oc), and prominent sensory cells (sc) running towards the olfactory chamber (oc). The entire structure is embedded in the epidermis (ep) and can be retracted via a distinct retractor muscle (rm). cc, ciliated supporting cell; ci, cilium; cu, cuticle; ecm, extracellular matrix; ep, epidermis; oc, olfactory chamber; rm., retractor muscle; sc, sensory cells. The image was redrawn and modified from Purschke 1997 [20]

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