488 



LABORATORY MANUAL OF HUMAN ANATOMY 



Fig. 257.) What is the general direction of the valve? What 

 coats of the intestine enter into its formation 1 

 Note 



(a) Inferior lip (labium inferius}. 



(b) Superior lip (labium superius}. 



(c) Frenula ("bridles" or "reins") of valve of colon (frenula valvulae 



coli). 



What is the function of the valve? 



Note the location of the opening of the vermiform process 

 into the caecum. Is it guarded by a valve (valvula processus 

 vermiformis} ! This valve was first fully described by Gerlach 



FIG. 257. 



Plicae semilunares coli 



valvulae coli 



,' Terminal part of the intestinum ileum 



Frenulum posterius valvulae coli 



Valvula processus vermiformis 



The intestinum caecum hardened in formalin and cut open in a plane passing through the entrance 

 of the intestinum ileum (valvula coli). The latter is closed and is cut in a frontal plane. (After Toldt, 

 Anat. Atlas, Wien, 1900, 2 Aufl., p. 428, Fig. 709.) 



in 1847. According to him, it is found in the embryo, but only 

 vestiges of it occur in the adult. Laffargue thinks that the for- 

 mation of this valve is pathological and is due to mechanical 

 pressure exerted by enteroliths in the lumen of the appendix. 

 The lumen of the appendix tends to become obliterated in the 

 adult. (Vide Fitz, Am. J. Med. Sc., 1886.) 



Open the vermiform process along its mesenteriolic border 



