Tag: Neuromere

adult mesothoracic neuromere [FBbt_00110175]

The second (anterior-posterior) of the 4 major neuropils of the adult ventral nerve cord (Court et al., 2020). It is mostly composed of the somata and projections of central neurons derived from the mesothoracic array of neuroblasts and the axonal projections of sensory afferents from the mesothoracic legs and mesothorax (Court et al., 2020). The mesothoracic neuromere is closely associated with two distinct subdivisions of the thoracic neuropils: the accessory mesothoracic neuromere and the tectulum (Court et al., 2020). It is delimited anteriorly by the entry points of the neuroglian-positive tracts from the anterior mesothoracic lineages 2, 7, 8, 10, 15 and 16 (Court et al., 2020). The posterior margin is defined by the entry points of the neuroglian-positive tracts from the posterior mesothoracic lineages 0, 3, 6, 12, 11, 19, 21 and 23, all of which project anteriorly into the neuromere (Court et al., 2020).

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adult metathoracic neuromere [FBbt_00110176]

The third (anterior-posterior) of the 4 major neuropils of the adult ventral nerve cord (Court et al., 2020). It is mostly composed of the somata and projections of central neurons derived from the metathoracic array of neuroblasts and the axonal projections of sensory afferents from the metathoracic legs and metathorax (Court et al., 2020). Its anterior boundary is best defined by the neuroglian tracts associated with the posterior mesothoracic hemilineages 0, 3, 6, 11, 12, and 21, which also define the posterior margin of the mesothoracic neuromere (Court et al., 2020). The posterior margin of the neuromere is defined by the neuroglian tracts from the posterior hemilineages 0, 3, 6, 20/22 and 21, all of which project anteriorly into the neuromere (Court et al., 2020).

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adult prothoracic neuromere [FBbt_00110174]

Anteriormost of the four major neuropils that makes up the adult ventral nerve cord (VNC) (Court et al., 2020). It is mostly composed of the somata and projections of central neurons derived from the prothoracic array of neuroblasts and the axonal projections of sensory afferents from the prothoracic legs and prothorax (Court et al., 2020). It is a bilaterally paired neuropil that exists as two more or less spherical masses (Court et al., 2020). Its anterior boundary defines the anterior extent of the VNC (Court et al., 2020). The posterior boundary can be defined by the extent of the primary neurite projections of the central neurons produced by the prothoracic neuroblasts 0, 3, 6, 11, 21, 20/22 and 23 (Court et al., 2020). Dorsal nerves that directly innervate the neuropil of the prothoracic neuromere (dorsal prothoracic nerve, prosternal nerve, prothoracic chordotonal nerve, prothoracic accessory nerve and ventral prothoracic nerve) emerge closely adjacent to each other in the anteriolateral corner of the prothoracic neuromere and sometimes appear to share a common exit point (Court et al., 2020).

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protocerebrum [FBbt_00003627]

The most anterior neuromere of the central nervous system, developing from neuroblasts of the labral and ocular segments (Urbach and Technau, 2003; Ito et al., 2014). The protocerebrum comprises many discrete neuropil regions including the central complex and mushroom bodies (Ito et al., 2014). Urbach and Technau (2003) divide the protocerebrum into labral and ocular neuromeres.

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