488 



ANATOMY IN A NUTSHELL. 



Under the deep set, we have (1.) Venae Galeni, which are two in number. 

 Thrv are formed by the vena corporis striata and vena choroidea. They pass 

 hack and onl of the transverse fissure to enter the straight sinus. These two 

 veins generally unite into one vein, just before the entrance into the straight 



sinus. (2.) The basilar vein is formed by the junction of the deep Sylvian vein, 

 inferior striate vein, and anterior cerebral veins. It now passes backward over 

 the cms cerebri to enter the vein of Galen just before its junction with the vein 

 of the opposite side. The cerebellar veins. Under these we have, (1) superior 

 qnes, which pass forward and inward to end in the straight sinus and the veins 

 of Galen, but some of them pass outward to the lateral and the superior petrosal 

 sinus, (2) the inferior cerebellar veins end in the lateral sinus, superior petrosal 

 sinus, and occipital sinus. 



The veins of the medulla oblongata and pons end in the inferior petrosal 

 sinus and lateral sinus. 



PLATE CCLX. 



WITH LACHRYMAL 



WITH SUP. 

 MAXILLARY. 1 



ARTICULATES WITH ETHMOID. 

 MAXILLARY PROC. 

 ARTIC. WITH PALATE 



POSTERIOR 

 END. 



Inferior Turbinated Bone. 



WITH LACHRYMAL. 



LESSON CL1X. 

 The Sinuses of the Dura Mater. (Plates CLXXVIII-CLXXIX.) 



The sinuses of the dura mater are as follows: 



1. The superior longitudinal sinus commences at the foramen caecum and 

 passes along the upper border of the falx cerebri to end in the torcular Her- 

 ophili, where ii receives the occipital sinus and the straight sinus. The blood 

 which passes through the superior longitudinal sinus and the occipital sinus 

 turns to the righl at the torcular Herophili to pass into the right lateral sinus, 

 while the blood from the straight sinus passes into the left lateral sinus. How- 

 ever, this may be vice versa. At the foramen caecum a small vein com- 

 municates with the veins of the nasal fossa' in children. This sinus on cross 

 section is triangular with apex below next to the falx cerebri. The chorda' 

 Willisii arc fibrous glands which constrict this sinus and take the place of valves. 

 Most of the radicle- of this sinus pass into it in such a manner that the blood 

 is received at righl angles to or againsl the current in the sinus. It receives 

 veins from the diploe and the dura mater, the superior cerebral veins, and veins 

 from the pericranium niter passing through the parietal foramina. 



