50 
DISTRIBUTION OF THE ARTERIES 
wards and backwards to the inferior oblique branch of the motor 
nerve of the eye*.” 
It is curious to compare these accounts of the ophthalmic 
ganglion — differing from each other in several points, shewing 
what various impressions the same thing will make on different 
persons, and yet all of them agreeing in the main. For my own 
part, I am now disposed to be very much of Dr. Quain’s 
opinion. It was not fitting that the motions of the iris should 
be under the control of the will — they should respond to the 
varying intensity of the light. A little ganglion, a portion of 
the organic system, is found at the back of the eye — it is con- 
nected with other portions of the ganglial system by the nasal 
branch of the ophthalmic, and at the same time it anastomoses, 
as Mr. Percivall and Dr. Quain very properly describe, with 
branches of the third pair, and also, according to Dr. Quain and 
Mr. Youatt, with other branches of the nasal, in order that the 
action of the voluntary nerve might, in some degree, be controlled, 
and rendered subservient to the full exercise of the function of 
the eye, and, perhaps, that occasionally the power of the 
voluntary nerve might aid that of the organic one. 
ON THE DISTRIBUTION OF THE ARTERIES IN 
THE HEAD OF THE SHEEP. 
By Dr. J. C. T. Barkow. 
The arteries of the head of the sheep are very remarkable in 
their distribution. The common carotid gives off collateral 
branches before it divides into two principal trunks, from which 
all the other branches are given off. The branches which pass 
off before the principal bifurcation are — the superior thyroideal, the 
ascending pharyngeal, the occipital, the lingual, the posterior 
auricular, and a parotidean. The external maxillary artery is 
wanting, and its branches are furnished by other vessels. The 
common carotid bifurcates into the facial and internal maxillary; 
the facial furnishes the anterior auricular and the temporal; it is 
continued under the name of transversalis fasciei, which gives off' 
the coronary artery of the upper lip. The inferior coronary is 
furnished by the mental, which is itself a branch of the internal 
maxillary. This latter is a very important artery in the sheep ; 
for it not only furnishes branches to the face, but also all those 
which in man come from the internal carotid. It gives oft' on 
each side three branches, which penetrate separately into the 
* Quain’s Anatomy, p. 768 ; a work that should be in the possession of 
every student, veterinary as well as medical. 
