16 INTERNAL ANATOMY OF INSECTS. 
he regarded as analogous to the recurrent nerves in the 
human subject, and therefore he distinguishes them by 
the same name?: they issue from the lower surface of the 
brain, or that which rests on the w@sophagus, and at first 
go towards the mouth, but afterwards turn back, and 
uniting form a small ganglion; this produces a single 
nerve, which passing below the brain follows the cesopha- 
gus to the stomach, where it swells into another gan- 
glion, from which issue some small nerves that render to 
the stomach, and one more considerable which accom- 
panies the intestinal canal, producing at intervals lateral 
filaments which lose themselves in the tunics of that tube”. 
Lyonnet afterwards discovered these nerves in the cater- 
pillar of the goat-moth*, and Cuvier in other insects?. 
The other nerves which issue from the brain exhibit 
no remarkable features. ‘Those which originate in the 
spinal marrow are mostly derived from the ganglions, and 
are sometimes interwoven with the muscles, as the woof 
with the warp in a piece of cloth®; those from the 
three or four first commonly rendering to the muscles of 
the legs, wings, and other parts of the ¢runk, and those 
from the remainder to the abdomen. After their origin 
they often divide and subdivide, and terminate in nume- 
rous ramifications that connect every part of the body 
with the sensorium commune. A pair of nerves is the 
most usual number that proceeds from each side of a 
ganglion’; but this is by no means constant, since in 
® Cuvier (ubi supr. 319.) seems not to have been aware that Swam- 
merdam was the first discoverer of these nerves, since he attributes 
their name to Lyonnet. 
> Bibl. Nat. i. 138. b. t. xxviii. f. 2. a, b, C.F. 3. g: 
: Ubi supr. 578. * Ubi supr. 320. 339, &c. 
Cav. ubi supr. 349, f Lyonnet Anat. t. ix. x. 
