250 ANIMAL PHYSIOLOGY. [LESSON 75. 



organ as it appears in the same Caterpillar (Fig. 371), and the fol- 

 lowing is the description of the nerves proceeding from it, and the 

 organs to which they are distributed : 



FIG. 371. 



Brain of a Caterpillar (Cossus ligniperda). 



A. Cerebrum, superior portion of the brain. 



B. Cerebellum, inferior portion of the brain. 

 a, a. Nerves of the eyes. 



&, &. Of the antennae. 



e. Cord passing around the oesophagus, proceeding from the cerebrum. 

 <?, d. Cord connecting the cerebrum and cerebellum, 

 e, e. Nerves of the mandibles (upper jaws). 

 f,f. Nerves of the maxillae (under jaws). 

 g, g. Second connecting nerve of the under lip, of which the nerve of the mandible is a 



branch. 



0*, g*. First nerves of the under lip, which give off a branch, M, to the muscles of the lower 

 , jaws. (The branches of the second nerve of the lip, g, g, give off a branch for a 



muscle, N.) 



O, O. Nerves of the muscles of the upper jaws and antennae. 

 P, P. Nerves of the muscles of the upper jaws. 



R. K. Nerves that distribute themselves at the posterior portion of the skull. 

 S. S. Nerves of the muscles of the neck, which pass into the thorax (chest). 

 V, V. Connecting cords of the cerebellum and first thoracic ganglion. 



D. The frontal ganglion, formed by the two branches, E, E, whence the sympathetic 

 nerve, F, originates. 



1132. It would be easy to present a further and more enlarged 

 view of the Cerebrum, chiefly for the more perfect demonstration of 

 those parts which are somewhat obscure, from the complexity of the 

 preceding figure, but want of space forbids it. 



1133. It has been shown that in the larval condition of an insect 



