52 Drxon——On the Development of the Branches of the Fifth Cranial Nerve in Man. 
little upwards, and backwards, behind the eyeball, comes nearer to the surface 
than the malar, which is directed downwards, outwards, and forwards, beneath 
the eyeball. 
C.R.—Superior maxillary nerve from origin to final division = 14 mm. 
Internal branches of superior maxillary : = 0:'6—1:0 mm. 
Malar nerve : , ‘ 5 ‘ = 0°4 mm. 
Temporal nerve ‘ 3 : : = 0°5 mm. 
Terminal branches : Z ‘ , = ill min. 
Meckel’s ganglion is, I believe, represented by a collection of cells, placed to the 
inner side, and slightly below the level, of the superior maxillary nerve. A few 
branches connect the superior maxillary nerve with this aggregation of the cells. 
The outline of this ganglion is, in places not easily followed. Passing into the 
ganglion from below and behind, is the large Vidian nerve, some of the fibres of 
which break up into a number of fine bundles, among the cells of the ganglion. 
Some of the cells of the ganglion are continued downwards and backwards, along 
the outer side of the Vidian nerve, and become continuous with the cells of the 
otic ganglion. The ganglion is somewhat pear-shaped, the stalk of the pear 
corresponding to the place where the Vidian nerve joins the ganglion, and the 
swollen part to the large upper end of the ganglion, which is also turned out- 
wards. The position and size of Meckel’s ganglion in this embryo do not support 
the idea, that its cells are derived from the cells seen among the fibres of the 
superior maxillary nerve, in the former two stages. Many of the fibres of the 
Vidian nerve do not enter the ganglion of Meckel, but end in the tissue to its 
inner side. 
Empryo F.M.—(7 weeks, 17°5 mm.). Figures 9 and 10, Plate I. 
The superior maxillary nerve arises from the anterior aspect of the Gasserian 
ganglion, practically from its middle point. The direction of the nerve is 
horizontally forwards, bisecting the angle formed between the ophthalmic and 
inferior maxillary trunks. The foramen rotundum is already defined, and the 
nerve, while passing through it, has its fibres more closely packed together than 
they are seen to be, before the nerve enters the foramen, or after it issues from it. 
Immediately after the nerve leaves the foramen rotundum, it gives off two 
branches, which turn outwards, and two which turn inwards. The outer two 
branches represent the temporal and malar nerves, while the inner two go to 
Meckel’s ganglion. The temporal and malar nerves (not shown in the figs.) at 
first lie close together, one behind the other, but as they pass outwards they 
diverge, the malar, which lies in front of the temporal, passing somewhat down- 
wards. The temporal and malar nerves can each be traced a distance of 0-8 mm., 
