Integrative Systems 



159 



Table 2 

 Sensory (Afferent) Nerve 



Central Connection 



Dorsal region of dorsal col- 

 umn of gray matter in 

 spinal cord 



Exit from 

 Central 

 Organ 



Deep region of dorsal column Dorsal root 

 of gray matter in spinal 

 cord 



Location of 

 Cell- Body 



Ganglion 

 on dorsal 

 root 



Receptors 



Exteroceptors in skin of 

 body-wall and propriocep- 

 tors in muscles of body- 

 wall 



Ganglion Interoceptors and proprio- 

 on dorsal ceptors of digestive tube 

 root and other coelomic viscera 



Motor (Efferent) Nerve 



into the central organs — into the brain via cranial nerves and into the 

 spinal cord via spinal nerves. There is, however, another system con- 

 sisting of fibers which are connected to a somewhat definitely localized 

 series of ganglions interposed between the central organs and the pe- 

 riphery. These ganglions have nervous connections with the central 

 nervous system, but the peripheral distribution of the nerves proceed- 

 ing outward from them is to those structures whose functions are of the 

 "visceral" type, whether the structures are situated in visceral or 

 somatic territory. This interpolated system is known as the "auto- 

 nomic," or formerly commonly called the "sympathetic," nervous 

 system. 



CRANIAL NERVES 



Nerves entering or emerging from the brain are called "cranial." 

 They are all paired. Fishes and modern amphibians possess 10 pairs. In 



