DORSAL ASPECT OF THE SKULL. 179 



OS LACHRYMALE (5) 



f CAUDAD ........ FRONTIS. 



OS NASALE (6) ............. 



........ 



VE \TRAD -I ETHMO-TURBINAL. 



J ' 



I M3SAD ......... NASALE (the platetrope). 



T 4TT?T?An J MAXILLARE. 



[ LATERAD ...... j PR^MAXILLARE. 



All the figures of the skull are of Fdis domestica. 



In the description of the figures, under the general heads, which ave arranged alphabet- 

 ically, the special parts are named commencing at the caudal extremity. 



For fuller information concerning any of the bones or foramina, refer to the Table of 

 Bones and of Foramina, pp. 175, 190. 



496. Preparation. The soft parts were entirely removed 

 ( 250, B). The roof of the left, side was then removed by sawing 

 carefully with a fine saw to the meson at a level just dorsad of the 

 orbits and about 2 mm. dorsad of the foramen magnum. The 

 frontal and parietal bones were then removed with nippers by sep- 

 arating them at the coronal, the sagittal and the lambdoidal sutures. 

 Finally, the interparietal and supraoccipital were removed by saw- 

 ing on the meson till the first incision was reached. This exposed 

 the frontal sinus and the ental surface of the base of the skull. 



497. Cn. Ich., Canalis lachrymalis Lachrymal canal. This canal passes ceph- 

 alo-ventrad and lies between the maxilla and maxillo-turbinal. It finally opens into the 

 nasal cavity just ventrad of the maxillary attachment of the maxillo-turbinal and nearly 

 opposite the fang of the canine tooth. 



498. Cst. Imd., Crista lambdoidalis. The lambdoidal crest corresponds to the 

 superior curved line of the occipital in Human Anatomy. Flower, A, 112, 182. 



499. Cst. temp., Crista temporalis Temporal crest. This marks the dorsal 

 limit of the temporal fossa and muscle. In young cats it is considerably separated from 

 the meson, but in adults it approaches it and may be mesal from the lambdoidal crest to 

 the coronal suture. The mesal part is then called sagittal crest ; Flower, A, 112. 



Fm. m., Foramen magnum, az. 



Fm. j., Foramen jugulare s. lacerum posterius. Jugular or posterior lacerated 

 foramen. 



Fm. ov., Foramen ovale. 



Fm. rt., Foramen rotundum. 



Fm. 1. a., Foramen lacerum anter^us s. lacerum orbitale, s. fissura sphenoida- 

 lis. Anterior or orbital lacerated foramen, sphenoidal fissure. 



Fm. op., Foramen opticum Optic foramen. 



