Cranial Nerves of Anolis carolinensis. 



PLATE 3. 



Fig. 6. Cranial and first three spinal nerves of the left side as projected upon 

 a sagittal plane and seen from the median side. Nerves III, IV and VI with 

 ciliary ganglion and its nerves are omitted; also the terminal rami of V and 

 XII are omitted, because they fall so nearly in the same frontal plane. 



Fig. 7. Ventral aspect of a dissection of the right side of the head showing 

 about the same group of nerves as figiu-e 4. The figure represents the dorsal 

 portion of the head, the ventral portion, including the bony roof of the mouth, 

 having been cut away to expose the nerves. The plane of division is carried 

 through the tympanum, the quadrate bone and the posterior bony arch of the 

 orbit. The whole mandibular group and ventral cervical muscles are removed, 

 while all those related to the orbit are retained. The shaded background 

 against which the maxillary bone is seen, represents the skin of the dorso- 

 lateral side of the head, the cut edge of which forms the margin of the figure. 

 The two superficial sympathetic rami connecting nerve VII with the lachrymal 

 plexus pass in part through the m. capiti mandibularis, which has been dis- 

 sected away. The structures of the orbit are those immediately exposed upon 

 the removal of the pterygoid and palatine bones. The portion of the maxil- 

 lary bone forming the ventral rim of the bony orbit is cut away exposing the 

 deeper surface of the lower eyelid. The hind brain is exposed, in the region 

 where the last three cranial nerves show their superficial origin, by the removal 

 of parts of the basisphenoid and basioccipital bones. The finer rootlets of 

 nerves IX and X were nearly transparent and practically invisible under the 

 dissecting microscope; the drawing, therefore, does not show their exact 

 number nor connection with the lateral side of the medulla. The part of the 

 medulla exposed is bent sharply away from the observer, making it difficult 

 to represent the linear arrangement of the roots of nerve XII and the occipi- 

 tal foramina through which they emerge. The representation of the details 

 of the muscles of the cervical region is not attempted. The m. spinalis colli 

 and part of the m. longissimus colli are removed, but the roots of the spinal 

 nerves are hidden by the remaining part of the m. longissimus colli. The 

 distribution of the small nerve branch given off from X at the point where 

 the communicating ramus (comn. IX-X.) joins IX, was not determined. It is 

 represented too large in the figure. 



