ADDENDA. 69: 



ADDENDA. 



Nerve supply to the muscular coats of the gut (cf. p. 693, 

 p. 642 et seq., p. 663). — Kecent observations l have strengthened the 

 general conclusions arrived at in the text, that the cranial autonomic 

 system sends motor fibres to both coats of the gut, and that the sym- 

 pathetic system sends inhibitory fibres to both coats. With regard to 

 this, it is to be borne in mind that the motor effect produced by stimulating 

 a particular nerve-strand varies somewhat in different animals in different 

 parts of the gut, and in different circumstances. The observations 

 strengthen also the view that the cranial system sends some inhibitory 

 fibres, and the sympathetic system some motor fibres, to both coats, but 

 it is clear that these fibres vary in number in the nerves to the different 

 parts of the gut and in different animals ; and although it is perhaps 

 probable that such fibres occur generally in mammals, further evidence 

 is required to place this view on a sound basis. 



Origin of splanchnic fibres supplying the stomach and intestine 

 (p. 644). — In the rabbit I have found the splanchnic inhibitory fibres 

 for the cardiac sphincter of the stomach arise from the fifth to the ninth 

 thoracic nerves inclusive. Bunch 2 in the dog finds that the vaso- 

 motor fibres for the small intestine leave the spinal cord by the second 

 thoracic to the fourth lumbar inclusive. For reasons indicated in the 

 text (pp. 464-465) I think the origin is probably less extensive. 

 Bunch considers that the same spinal nerves, and especially the upper 

 ones, send vaso-dilator fibres to the small intestine. 



Nerve-fibres supplying the coronary vessels (p. 642, p. 663). 

 — Maass 3 states that in the cat vaso-dilator fibres pass to the coronary 

 artery from the ganglion stellatum, and that vaso-constrictor and some 

 vaso-dilator fibres pass to it from the vagus. 



Nerve supply of the bladder (p. 646, p. 667). — Stewart 4 gives an 

 account of a careful investigation of the innervation of the bladder of 

 the cat. He confirms the statement that the sacral and sympathetic 

 nerves supply both circular and longitudinal fibres of the bladder, and 

 finds further evidence of inhibitory fibres for the bladder in the 

 hypogastric nerves. 



Origin from spinal cord of pelvic nerve (p. 666, p. 689). — 

 Harman 5 finds that in man the pelvic nerve receives its fibres chiefly 

 from the third sacral spinal nerve ; usually it receives fibres also from 

 the second and fourth sacral nerves, but sometimes from only one of 

 them. The number of medullated fibres from the several sources is 



given 



The enteric nervous system (p. 668). — An important observation 



1 Langley, Journ. Physiol., Cambridge and London, 1898, vol. xxii. p. 90;") (motor and 

 inhibitory vagus fibres for the stomach of the rabbit, especially for the cardiac sphincter). 

 Cf. the earlier observations of Openchowski, Arch. f. Physiol., Leipzig, 1889, S. 549. Cf. 

 also Curtado and Guyon (observations on dog), Journ. de physiol., etc., Paris, 1899, tome i. 

 p. 38 ; Bayliss and Starling, Journ. Physiol., Cambridge and London, 1899, vol. xxiv. 

 p. 99 (motor and inhibitory vagus fibres for the small intestine of the dog ; inhibitory 

 fibres only were found in the splanchnic, but cf. Bunch {infra); Bunch, ibid., vol. xxv. 

 p. 22 (motor and inhibitory fibres for the small intestine of the dog both in vagus and in 

 splanchnic). 



3 Journ. Physiol., Cambridge and London, 1899, vol. xxiv. p. 72. 



3 " Exper. Untersuch. ueber d. Innervation der Kranzgefasse," Rostock, 1899. 



4 Am. Journ. Physiol., 1899, vol. ii. p. 182 ; vol. iii. p. 1. 



5 Journ. Anat. and Physiol., London, 1899, vol. xxiii. p. 380. 



