54 Drxon—On the Development of the Branches of the Fifth Cranial Nerve in Man. 
the ganglion from the two branches which are derived from the superior maxillary. 
These palatine nerves are three in number, the anterior one being the longest, and 
running downwards and forwards over the roof of the mouth, but not reaching as 
far as the ‘“‘Zahnleiste.” The two posterior branches are shorter, and more 
vertical in direction. The anterior branch is more than 1:0 mm. in length. 
From Meckel’s ganglion a branch also runs horizontally inwards, towards the 
mesial plane, the fibres of which seem to come chiefly from the Vidian nerve. 
This branch running inwards from the ganglion in this way probably represents 
the naso-palatine of the adult. Its length cannot be accurately determined. It 
is not shown in the figures. 
The Vidian nerve, which joins the ganglion of Meckel in its posterior and 
inner part, can be traced to the geniculate ganglion of the facial. The direction 
of the Vidian, just before its termination in Meckel’s ganglion is upwards, 
inwards, and a little forwards. The ganglion of the facial, from which the 
Vidian comes, lies quite free from the periotic capsule, and is not at this time 
surrounded by cartilage. Further, the geniculate ganglion lies very close to, if 
not in contact with the otic ganglion. The Vidian nerve is at first behind the 
otic ganglion, and then as it passes upwards, it inclines inwards, and a little 
forwards, crossing to the ner side of the otic ganglion. In its course the nerve 
lies at one time between the Eustachian tube and the periotic capsule, and while 
in this position it crosses the carotid artery on its outer and anterior aspect. As 
it crosses the carotid the Vidian receives a fine communication from a nerve which 
runs on the artery, and appears to rise chiefly from the trunk ganglion of the 
vagus nerve (see fig. 10, Plate I.). The Vidian also receives a very fine com- 
municating branch from the nerve of Jacobson, which reaches it by running along 
the side of the carotid artery. 
Empryo Mr.—(8 weeks). 
The superior maxillary nerve, arising from the lower and anterior part of the 
Gasserian ganglion, runs forward and downwards through a distinct canal in the 
basis cranii. The course of the nerve is now forwards, beneath the eyeball and 
the eye muscles. ‘To the inner side of the nerve near its origin, and on a slightly 
lower level, lies Meckel’s ganglion. The nerve is connected with the ganglion by 
a well marked branch. ‘The superior maxillary nerve ends near the surface of the 
face, below the eyeball, by breaking up into a number of branches, the longest of 
which turn inwards. ‘The length of the nerve to its final breaking up is 2°2 mm. 
Just before the nerve divides into its terminal branches, it gives off a fine twig 
which passes downwards through the ossifying upper jaw, towards the ‘ Zahn- 
leiste.” The length of this nerve was not determined, but it is at least 0-9 mm. 
In Mr. the temporal and malar branches were not traced. Meckel’s ganglion 
