264 



MUSCLE-TISSUE. 



the transverse section by disks, exhibiting, when the razor has 

 passed through the middle of the spindle, the bright central 

 nucleus. (See Fig. 109.) 



Bundles of smooth muscle are often found connecting into a 

 reticulum f. i., in the scrotum, the labia majora, the prostate 

 gland, the urinary bladder. The bundles are spread in flat 

 layers throughout all larger tubular formations of the ali- 

 mentary and the genito-urinary tract. We find in these tubes 

 at least two layers, of which the one nearest the epithelial sur- 



FIG. 109. BUNDLES or SMOOTH MUSCLE IN THE DERMA OF THE SKIN 

 OF THE NIPPLE. CHROMIC ACID SPECIMEN. 



L, longitudinal, O, oblique, T, transverse section of a bundle ; D, derma of the skin ; N, 

 probably termination of a nerve. Magnified 500 diameters. 



face is circular, and the other longitudinal. In the intestinal 

 tract the mucous membrane has two delicate layers (transverse 

 and longitudinal), while the tube possesses in addition two 

 layers, of which the circular is far more developed than the 

 longitudinal. In the stomach, the bladder, and the uterus, 

 numerous oblique bundles run between the circular and 

 longitudinal. In the lower third of the oesophagus smooth 



