62 Dixon—On the Development of the Branches of the Fifth Cranial Nerve in Man. 
A large trunk, into which ean be traced, most of the fibres of the motor root of the 
trigeminal, also rises from the outer aspect of the inferior maxillary. This trunk 
turning outwards, downwards, and forwards, to the outer side of the internal 
maxillary artery, ends in the developing muscles. 
The long buccal nerve is placed deeply, its general direction being forwards 
and a little downwards, towards the mouth cleft. It described, however, a curve 
which is convex upwards, and passes through developing muscle fibres, which 
lie at right angles to its direction, these muscle fibres probably represent the 
buccinator muscle. The nerve ends, after a course of 1°4 mm., on the outer side 
of the mouth cavity. 
The lingual nerve comes from the deeper part of the inferior maxillary, and is 
placed close to the nerve to the internal pterygoid muscle, The lingual passes 
downwards and forwards, towards the middle line, behind and internal, to the 
upper border of Meckel’s cartilage. ‘Towards its termination, however, it is not 
as close to Meckel’s cartilage, as it is in the first part of its course. The nerve, as 
it approaches the middle line, at first lies above the submaxillary gland, but soon 
the duct of this gland passes up behind it. The lingual nerve gives a distinct 
twig to the gland. The length of the lingual is 14mm. The lingual nerve is 
joined near its origin by the chorda tympani, which passes upwards from the facial 
nerve, in close relation to the outer and upper end, of Meckel’s cartilage. The 
chorda tympani is 1°6 mm. in length. 
The submaxillary ganglion is a distinct aggregation of cells round the lingual 
nerve, where it lies above the submaxillary gland. 
The otic ganglion lies to the imner side of the inferior maxillary nerve, but 
part of it is continued upwards, between the cartilages of the basis cranu, coming 
close to the Gasserian ganglion. ‘This process of the otic ganglion seems to be 
continuous with a similar process of Meckel’s ganglion. ‘The Vidian nerve, on its 
way to Meckel’s ganglion, is in very close relation to the otic ganglion; further, 
the cells of the otic and Meckel’s ganglion become continuous along the outer 
side of the Vidian nerve. 
¥’.M.—Inferior maxillary trunk to origim of lingual nerve = 0-4 mm. 
Inferior dental nerve . : . = 1:6 mm. 
Mylo-hyoid branch. : : : = 1°6 mm. 
Long buccal nerve : : : ; = 1-4 mm. 
Lingual] nerve ; : : : = 1-4 mm. 
Chorda tympani : : : 5 =a 1:6 mm. 
In Embryo F.M., and also in another embryo of about the same age, namely, 
Wt., the fifth nerve is connected with the ninth and tenth cranial nerves, in the 
