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Fig. 9 | BMC Evolutionary Biology

Fig. 9

From: The first data on the innervation of the lophophore in the rhynchonelliform brachiopod Hemithiris psittacea: what is the ground pattern of the lophophore in lophophorates?

Fig. 9

Details of the organization of the accessory brachial nerve, the lower brachial nerve, and the second accessory nerve in Hemithiris psittacea. Z-projections after mono- (a, b) and double- (e) immunostaining against alpha acetylated-tubulin (grey) and serotonin (green); volume rendering of some nerve elements stained against alpha acetylated-tubulin (grey – f; glow – g): thin cross sections of the brachium (c-d). a The structure of the accessory brachial nerve appears disorganized. (B) The lower brachial nerve. c Ultrastructure of the accessory brachial nerve, which consists of several neurite bundles (marked by orange) scattered in the epithelium of the food groove. d Ultrastructure of the lower brachial nerve consisting of mostly longitudinal neurites. e The distal end of the brachium: a mesh of neurites of the lower brachial nerve (ln), which lacks a prominent serotonin-like immunoreactive portion. f Intertentacular nerves (itn) originate from the lower brachial nerve and give rise to the abfrontal tentacular nerves (afn) of outer tentacles. g A portion of the second accessory nerve (sa). Abbreviations: afn – abfrontal tentacular nerve; an – accessory brachial nerve; bcn – branches of cross nerves; ecm – extracellular matrix; gl – layer of glandular cells; itn – intertentacular nerve; lfn – laterofrontal tentacular nerve; ln – lower brachial nerve; mf – nerve fibers; mi – microvilli; sa – second accessory nerve

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