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'eum (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 incfsiva (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. foramen, 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 antihe'lix (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 (L. 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. 



