The house-fly, Musca domestica Linn: its structure, habits, development, relation to disease and control . of thethree pairs of legs (, , ) arise from three largeganglia, which are the prothoracic (), mesothoracic {)and metathoracic () ganglia. These are united by a medianlongitudinal band of nerve tissue, which runs dorsal to them, andbehind the metathoracic ganglia swells out into a ganglionic mass() which represents the abdominal ganglia. In this mediandorsal band thcic is a median dorsal fissure stretching posteriorly THORACIC GANGLION 33 from above the
The house-fly, Musca domestica Linn: its structure, habits, development, relation to disease and control . of thethree pairs of legs (, , ) arise from three largeganglia, which are the prothoracic (), mesothoracic {)and metathoracic () ganglia. These are united by a medianlongitudinal band of nerve tissue, which runs dorsal to them, andbehind the metathoracic ganglia swells out into a ganglionic mass() which represents the abdominal ganglia. In this mediandorsal band thcic is a median dorsal fissure stretching posteriorly THORACIC GANGLION 33 from above the middle of the mesothoracic ganglia. The doisalregions of the mesothoracic and metathoracic ganglia show gangli-onic swellings. From the antero-dorsal sides of the prothoracicganglia a pair of prothoracic dorsal neives () arises and su])pliesthe muscles of that rejjion, includin>j those of the anterior thoracicspiracle. The nerves supplying the mesothoracic legs (\)arise from the postero-ventral sides of the mesothoracic the mesothoracic ganglia there is a median ganglionic. Fig. 10. Thoracic compound ganglion aftei the removal of the cortex. Seen fromthe ventral side. This and fig. 9 were drawn from models reconstructed fromsections. , , Pro-, meso-, and meta-thoracic ganglia. Abdominalganglion. Other lettering as in fig. 8. mass, situated slightly dorsal, from the middle region of whichthe nerve fibres of the large pair of dorsal mesothoracic nerves() arises; Lowne, in the blow-fly, calls these roots of these nerves are broad dorso-ventrally. These nervesinnervate the stemo-dorsales muscles of the middle region. Inthis median mesothoracic nerve centre, posterior to the originof the dorsal mesothoracic nerves, the fibres of a pair of nerves,the accessory dorsal mesothoracic nerves (), have theirorigin; externally these appear to arise dorsal to the roots ofthe mesothoracic crural nerves. The dor
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishercambridgeuniversit
