Summary
The present work describes the neuroanatomy of the thoracic ganglia in the adult sphinx moth Manduca sexta from transverse, horizontal and sagittal sections in order to provide a basis for a more precise description of identified neurons and their connections within the thoracic ganglia. The prothoracic ganglion of M. sexta derives from a single neuromere, whereas the pterothoracic ganglion results from the fusion of the meso- and metathoracic and the first and second abdominal neuromeres. Each hemiganglion contains nine longitudinal tracts (MDT, LDT, DMT, DIT, VLT, VIT, LVT, MVT and VMT) and six dorsal (DC I–VI) and five ventral commissures (VC I, dVCL II, vVCL II, SMC and PVC). Additionally there are vertical or oblique tracts such as the T-tract, C-tract or I-tract. The ring tract could not be found, LDT, DIT, DMT and MVT1 are compact and well defined, whereas VMT and MVT and also VLT and VIT are difficult to separate in many sections. MDT and especially LVT are quite inconspicuous in transverse sections. In horizontal or sagittal sections it is much easier to identify these tracts. As in Locusta migratoria and Carausius morosus, the second dorsal commissure (DC II) is subdivided. DC IV and DC V are difficult to separate in all cutting planes. The results are compared with published data of other insects. The present work supports the hypothesis of a common basic pattern of all insect ganglia.
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Abbreviations
- CT :
-
C-tract
- DC I-DC VI :
-
dorsal commissures I–VI
- DIT :
-
dorsal intermediate tract
- DMT :
-
dorsal medial tract
- irs :
-
interganglionic rest space
- IT :
-
I-tract
- LDT :
-
lateral dorsal tract
- LVT :
-
lateral ventral tract
- MDT :
-
medial dorsal tract
- mtr :
-
middle trachea
- MVT :
-
medial ventral tract
- PVC :
-
posterior ventral commissure
- SMC :
-
supramedian commissure
- TT :
-
T-tract
- VC I :
-
ventral commissure 1
- dVCL II :
-
dorsal aspect of ventral commissure II
- vVCL II :
-
ventral aspect of ventral commissure II
- VIT :
-
ventral intermediate tract
- VLT :
-
ventral lateral tract
- VMT :
-
ventral medial tract
References
Babu KS, Barth FG (1984) Neuroanatomy of the central nervous system of the wandering spider, Cupiennius salei (Arachnida, Araneida). Zoomorphology 104:344–359
Boyan G, Williams L, Fullard J (1990) Organization of the auditory pathway in the thoracic ganglia of noctuid moths. J Comp Neurol 295:248–267
Bräunig P, Hustert R, Pflüger HJ (1981) Distribution and specific central projections of mechanoreceptors in the thorax and proximal leg joints of locusts. I. Morphology, location and innervation of internal proprioceptors of pro- and metathorax and their central projections. Cell Tissue Res 216:57–77
Casaday GB, Camhi JM (1976) Metamorphosis of flight neurons in the moth Manduca sexta. J Comp Physiol 112:143–158
Dombrowski UJ (1987) Sensorik und Flugsteuerung bei einem Schmetterling (Manduca sexta L.). In: Elsner N, Creutzfeldt O (eds) New frontiers in brain research. Thieme, Stuttgart New York, p 47
Eaton JL (1988) Lepidopteran anatomy. Wiley Interscience Publications, Wiley & Sons, New York
Gregory GE (1974) Neuroanatomy of the mesothoracic ganglion of the cockroach. Phil Trans R Soc Lond 267:421–465
Gregory GE (1980) The Bodian protargol technique. In: Strausfeld NJ, Miller TA (eds) Neuroanatomical techniques. Springer, Berlin New York, pp 77–95
Kent KS, Levine RB (1988) Neural control of leg movements in a metamorphic insect: persistence of larval leg motor neurons to innervate the adult legs of Manduca sexta. J Comp Neurol 276:30–43
Kien J, Altman JS (1979) Connections of the locust wing tegulae with metathoracic motoneurons. J Comp Physiol 133:299–310
Kittmann R, Dean J, Schmitz J (1991) An atlas of the thoracic ganglia in the stick insect, Carausius morosus. Phil Trans R Soc Lond B 331:101–121
Pflüger HJ, Elson R, Binkle U, Schneider H (1986) The central nervous organization of the motor neurones to a steering muscle in locusts. J Exp Biol 120:403–420
Pflüger HJ, Bräunig P, Hustert R (1988) The organization of mechanosensory neuropils in locust thoracic ganglia. Phil Trans R Soc Lond B 321:1–26
Pipa RL, Cook EF, Richards AG (1959) Studies on the hexapod nervous system. II. The histology of the thoracic ganglia of the adult cockroach, Periplaneta americana (L.). J Comp Neurol 113:401–433
Power ME (1948) The thoracico-abdominal nervous system of an adult insect, Drosophila melanogaster. J Comp Neurol 88:347–409
Pyle RW (1941) The fibre tracts of the fused thoracic ganglia of the adult Ephestia kuehniella Zeller (Lepidoptera: Pyralidae). Psyche 48:123–128
Rind CF (1983a) The organization of flight motoneurons in the moth, Manduca sexta. J Exp Biol 102:239–251
Rind CF (1983b) A directionally sensitive motion detecting neurone in the brain of a moth. J Exp Biol 102:253–271
Rehder V (1988) A neuroanatomical map of the suboesophageal and prothoracic ganglia of the honey bee (Apis mellifera). Proc R Soc Lond B 235:179–202
Seabrook WD (1968) The structure of a pregenital abdominal ganglion of the desert locust Schistocerca gregaria (Forskal). Can J Zool 46:965–980
Tyrer NM, Altman JS (1974) Motor and sensory flight neurones in a locust demonstrated using cobalt chloride. J Comp Neurol 157:117–138
Tyrer NM, Gregory GE (1982) A guide to the neuroanatomy of locust suboesophageal and thoracic ganglia. Phil Trans R Soc Lond B 297:91–123
Tyrer NM (1983) Locust flight neurones within the anatomical frame work of the thoracic ganglia. In: Nachtigal W (ed) BIONA-Report 2, Akad Wiss Mainz. Fischer, Stuttgart, pp 105–112
Watson AHD (1986) The distribution of GABA-like immunoreactivity in the thoracic nervous system of the locust Schistocerca gregaria. Cell Tissue Res 246:331–341
Wigglesworth VB (1957) The use of osmium in the fixation and staining of tissues. Proc R Soc Lond B 147:135–142
Wohlers DW, Huber F (1985) Topographical organization of the auditory pathway within the prothoracic ganglion of the cricket Gryllus campestris L.. Cell Tissue Res 239:555–565
Zawarzin A (1924) Zur Morphologie der Nervenzentren des Bauchmarks der Insekten. Z Wiss Zool 122:323–434
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Suder, F., Wendler, G. Organisation of the thoracic ganglia of the adult sphinx moth Manduca sexta (Insecta, Lepidoptera). Zoomorphology 113, 103–112 (1993). https://doi.org/10.1007/BF00403088
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DOI: https://doi.org/10.1007/BF00403088