MOVEMENTS OF THE ALIMENTARY (ANAL, ETC. 393 



centre. Langley and Anderson, 1 who also obtained this effect, give it a special 

 explanation, contending that it is not a true reflex. 



The immediate spinal centre through which the contractions of the bladder 

 may be reflex ly stimulated or inhibited lies, according to the experiments of 

 Goltz, in the lumbar portion of the cord, probably between the second and fifth 

 lumbar spinal nerves. In dogs in which this portion of the cord was isolated 

 by a cross section at the junction of the thoracic and lumbar regions, micturi- 

 tion still ensued when the bladder was sufficiently full, and could be called 

 forth reflexly by sensory stimuli, especially by slight irritation of the anal 

 region. This localization has been confirmed by others. 2 



Movements of other Visceral Organs. — For the characteristics of the move- 

 ments of other viscera reference must be made to the appropriate sections. 

 The movements of the arteries are described under Circulation, those of the 

 uterus under Reproduction. 



1 Journal of Physiology, 1894, vol. xvi. p. 410; see also Justschenko : Archives des Sciences 

 biologiques, 1898, t. 6, p. 536. 



2 See .Stewart: American Journal of Physiology, 1899, vol. ii. p. 182. 



