GLOSSARY. 53 



Fon'tanelle (L. fons, a fountain). A membranous interval 

 between the bones of the skull; so called because the pul- 

 sation of the arteries may be seen at this part 



Fora'men cae'cum (L. blind opening). The termination of the 

 anterior fissure of the medulla oblongata. 



Fora'men commu'ne ante'rius (L. common anterior opening). 

 The opening by which each lateral ventricle of the brain 

 communicates with the third ventricle, usually called the 

 foramen of Munro. 



Fora'men la'cerum poste'rius (L. the posterior torn opening). 

 The aperture by which the ninth and tenth, and, 

 (when present,) the eleventh pairs of nerves pass out of the 

 skull. 



Fora'men Mun'ro. The opening by which each lateral ventricle 

 of the brain communicates with the third ventricle. 



Fora'men ova'le (L. oval opening). The opening by which in 

 the foetus the right auricle of the heart communicates with 

 the left. Also a hole in the floor of the skull by which the 

 third division of the fifth nerve issues. 



Fora'men of Winslow. A passage by which the smaller sac of 

 the peritoneum communicates with the general peritoneal 

 cavity. 



Fora'mina inci'slva (L. incisor openings). Openings left be- 

 tween the praemaxillse and palatine plates of the maxillary 

 bones in the Mammalia. 



Fora'mina obturato'ria (L. openings to be stopped up). Aper- 

 tures in each of the innominate bones between the ischium 

 and the pubes, which are closed by fibrous membrane. 



Foramini'fera (L. fordmen,an. opening ',fero, I bear). A.group 

 of Protozoa, having openings in the skeleton through 

 which the pseudopodia pass. 



For'nix (L. an arch or vault). A thin layer of nerve tissue in 

 the floor of the lateral ventricles of the brain. 



Fos'sa of antihelix (L. fossa, a ditch). A depression in the 

 antihelix of the external ear. 



Fos'sa duc'tus veno'si (L. ditch of the venous duct). The pos- 

 terior part of the longitudinal fissure of the liver. 



Fos'sa of gall-bladder (I* fossa, a ditch). The depression in 

 the liver in which the gall-bladder is lodged. 



Fos'sa of helix (L. fossa, a ditch). A narrow groove in the 

 external ear, between the helix and the antihelix. 



Fos'sa innomina'ta (L. nameless ditch). Another name for the 

 fossa of the helix. 



