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Fig. 6 | Zoological Letters

Fig. 6

From: Detailed morphology of tentacular apparatus and central nervous system in Owenia borealis (Annelida, Oweniidae)

Fig. 6

Histology and ultrastructure of the coelom of the head of Owenia borealis. A Semi-thin transverse section of the head: the spacious head coelom is visible. B Ultrastructure of a part of coelomic lining, which is formed by alternating peritoneal and myoepithelial cells. Adherence junctions between cells are indicated by arrowheads. Hemidesmosomes are indicated by double arrowheads. C Coelomic lining, which is formed by monociliated myoepithelial cells. Adherence junctions between cells are indicated by arrowheads. Hemidesmosomes are indicated by double arrowheads. D A part of wall of blood vessel, which consists of monociliated myoepithelial cells. Abbreviations: ac – accessory centriole; af – actin filaments; anc – outer ring of the anterior nerve center; apj – apical projections of myoepithelial cells; bb – basal body; bv – blood vessel; ci – cilium; cf. – collar fold; cm – circular muscles; cor – circumoral nerve ring of the anterior nerve center; ecm – extracellular matrix; G – Golgi apparatus; hc – head coelom; lm – longitudinal muscle; m – moth; mf – myofilaments; my – myosin filament; n – nucleus; pc – peritoneal cell; sr – striated rootlet; vll – ventrolateral lip; vpo – ventral pharyngeal organ

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