426 



Was die Lagerung der Art. car. ext. in dem oben beschriebenen 

 Fall zwischen M. biventer und M. stylohyoideus betrifft, so ist in der 

 Literatur meines Wissens nur ein einziger solcher Fall notiert und 

 zwar in Quains Atlas, Tafel XII, Fig. 5. 



Literatur. 



Delitzin, S., Arteria maxillaris communis. Arch. f. Anat. u. Entwicke- 



luDgsgesch., 1890, p. 268. 

 Hyrtl, Art. palatina ascendens als Ersatz für die fehlende Maxillaris 



interna. Oest. Zeitschr. f. prakt. Heilkunde, 1859, No. 30. 

 JoESSEL, Anomalie der Maxillaris interna. Arch. f. Anat. u. Entwicke- 



lungsgesch., 1878, p. 433. 

 KaijAntaeow, Russische Medizin, 1886, No. 13 (zit. nach Delitzin). 

 Qdain, Atlas, Plate 12, Plate 13. 

 Tandler, Julius, Zur vergleichenden Anatomie der Kopfarterien bei den 



Mammalia. Denkschriften d. kaiserl. Akad. d. Wissensch., mathem.- 



naturwissensch. Kl., Bd. 67. 

 — , Zur Entwickelungsgeschichte der Kopfarterien bei den Mammalia. 



Morphol. Jahrb., Bd. 30, 1902. 



Nachdruck verboten. 



The Structure of Smooth Muscle of the Intestine in the Con- 

 tracted Condition. 



(Preliminary Communication.) 



By Caroline Mc Gill, A. M., Instructor in Anatomy, 

 University of Missouri. 



With 5 Figures. 



In this paper will be described some of the finer structural 

 changes which take place during contraction in the smooth muscle of 

 the intestinal wall, more especially in the nuclei and the myofibrillse. 

 The structure of smooth muscle in the uncontracted condition will re- 

 ceive only a brief consideration. A more extensive description of both 

 contracted and uncontracted smooth muscle, including a review of the 

 literature, will be given in a later paper. 



Intestinal muscle of Necturus, dog, cat, pig and man was the 

 material used. In the large intestine of both dog and cat, by merely 

 opening the abdominal cavity and exposing a segment of the tube to 

 the air, very firm contraction rings appear, extending around the en- 

 tire circumference. Between these rings are areas of entirely relaxed 

 muscle. Furthermore, the large intestine is not highly irritable, and 



