THE STEUCTUKE OF SMOOTH MUSCLE IN THE KEST- 

 ING AND IN THE CONTRACTED CONDITION. 



CAROLINE McGILL, 

 Instructor in Anatomy, University of Missouri. 



With 7 Text-Figures and 7 Plates. 



Introductiou 



Literature Review 



PAGE 



494 



495 



1. On the structure of resting smooth muscle 495 



2. Ou the structure of contracted smooth muscle 495 



III. Material aud Methods 500 



1. Material used 5O0 



2. Fixation of resting muscle 501 



3. Fixation of contracted muscle 502 



4. Methods of fixation, embedding and staining 5Q5 



IV. Structure of Resting Smooth Muscle 597 



1. General structure of smooth muscle tissue 507 



a. Smooth muscle with complete syncytial structure 509 



h. Smooth muscle with end to end anastomoses of fibers. 511 



c. Smooth muscle with apparently isolated fibers 513 



2. MyofibrilhTe 514 



a. Fine myofibrillie 515 



h. Coarse myofibrillse 515 



3. Nuclei . 516 



4. Interstitial connective tissue . 5J7 



V. Gross Changes in the Muscle Coats During Contraction . 513 



1. In the digestive tract 51g 



2. In arteries 520 



VI. Forms of Contraction in Smooth Muscle 52o 



1. Peristaltic Contraction 52o 



a. The form of the contraction wave 521 



b. The form of the contraction node 524 



2. Total Contraction 527 



'HH AMEI!IC.\N JorUNAF, OK AN.\T()MY. — Vol.. IX, No. 4. 



