Neuro- Muscular Structures in the Heart. 



201 



At the same time that the muscle becomes prominent in a bundle it may 

 be noticed that a very large increase in the blood supply has taken place, 

 and that, instead of the occasional small vessel observed at the commence- 



b.v. 



c.t.s. 



Transverse section of structure tying in the connective tissue between the auricle and 

 ventricle of human heart. X about 300. c.t.s., connective tissue sheath; l.s., lymph 

 space ; b. v., blood vessel ; n.f., nerve fibres ; m., muscle. The general relations of 

 parts only are shown, minute detail being for the most part omitted. 



merit, a rich supply of blood is brought to the bundle by vessels of 

 considerable size, and distributed through its substance. It may be stated 

 generally that the Mood supply is found to be most abundant in tlmsr 



