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Fig. 11 | Zoological Letters

Fig. 11

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

Fig. 11

Ultrastructure of head nerve elements in Owenia borealis. Ultra-thin transverse sections. A A portion of the outer ring of the anterior nerve center. B A portion of the circumoral nerve ring. Supportive cells (= radial glial cells) are shown in blue; perikarya are shown in yellow. Hemidesmosome is indicated by double arrowhead. Dense tips of microvilli are indicated by arrowheads. Abbreviations: ac – accessory centriole; aj – adherence junction; bb – basal body; ci – cilium; cm – circular muscles; cn – cross extended neurites; cu – cuticle; ecm – extracellular matrix; edg – electron dense granules; gc – gland cell; if – intermediate filaments; ln – longitudinally extended neurites; mi – microvilli; n – nucleus; np – neuropil; pk – perikaryon; rm. – radial muscles; v –vesicle.

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