466 



MAMMALIA— PHYSIOLOGY 



The internal activities include all the processes related to metab- 

 olism, the distribution of nutritive material to various parts of the 

 organism, and the various processes connected with the formation 

 of the reproductive elements and the nutrition of the embryo. 



Sensory Nerves. — The nerve fibers and central mechanisms which 

 have to do with the stimuli affecting the welfare of the animal in 

 its surroundings are the somatic afferent or somatic sensory division 

 of the Nervous System. 



Lombdoidal rid<je — 

 Interpariefal 



Zygomatic process 

 of frontal 



Supraorbital ridgs — 



Lachrymal 

 fnfra-orbilol foramen 



Nosal capsule 

 Maxillary 



Suprooccipital 

 Sa(jittal ridge 



— -V ¥\ Porie tal 



Temporal 



Zygomatic process 

 of temporal bone 



— Jj Temporal fossa 



^Frontal process 

 of malor 



—Zygomatic arch 



ti/lalar 



Supraorbital ridge 



— Orbit 



__Zygomotic process 

 of maxillary bone 



■Lacfirymal foramen 

 Nasal 

 — Foramina incisa 



— i- — -yf-l- Anterior nores 



— Infermoxillory 



Fig. 251. Dorsal view of the skull of the cat. (Drawn by W. J. Moore.) 



All the nervous structures concerned with impulses arising in 

 the viscera, in the taste organs, and in the olfactory organ are 

 closely related and constitute the visceral afferent or viscer0->sensory 

 division of the nervous system. 



Motor Nerves. — All the usual movements of locomotion, of 

 offense and defense are directed ordinarily in response to stimuli 

 from without. Somatic movements are also performed in response 

 to gustatory and olfactory stimuli and have for their object the 

 capturing of food. In general, while somatic movements may be 

 called forth by visceral stimuli, they are more typically called forth 

 by somatic stimuli, and are more precise when they are directed 

 in response to them. 



