CONTRIBUTIONS TO ZOOLOGICAL PATHOLOGY. 265 
The internal surface is smooth, and lined with the laryngeal mu- 
cous membrane. 
The posterior edge of the body sends back two cornua for arti- 
culation with the first ring of the trachea, and anteriorly it presents 
two oblique articular surfaces, placed upon its side, for articulating 
with the arytenoid cartilages. The anterior edge of the ring-like 
process gives attachment to the crico-arytenoidei laterales muscles, 
and corresponds in direction to the true vocal chords : it is concave 
in the mesial plane, and gives attachment to the dense elastic 
membrane — the crico-thyroid. 
The arytenoid cartilages , two in number, are situated on the 
anterior edge of the body of the cricoid cartilage, and of an irre- 
gular triangular form. Their base is broad and hollow, in the form 
of a sigmoid cavity, and is articulated to the cricoid cartilage ; and 
their apex, stretching forwards, gives attachment to the cuneiform 
cartilages. Their internal surface is smooth, and covered by the 
lining membrane of the larynx ; and their external surface is di- 
vided into two portions by a very prominent ridge, that gives 
attachment behind to the crico-arytenoideus posticus, and before 
to the crico-arytenoideus transversus. The anterior of these sur- 
faces gives attachment to the anterior and posterior thyro-aryte- 
noidei, and the crico-arytenoideus lateralis ; and the posterior is 
occupied by the attachment of the arytenoideus muscles. The 
anterior or superior edge of either cartilage is thin and pointed to 
the mesial plane of the larynx, and is separated from the opposite 
cartilage by a large oval fissure, occupied by a quantity of loose 
fat and cellular tissue, that is covered within by the lining mem- 
brane, and without by the tendinous arch of the arytenoid muscles. 
The anterior or external edge of either cartilage is directed down- 
wards, forwards, and outwards, in a line with the ring of the 
cricoid, and gives attachment to the yellow elastic tissue of the 
true vocal chords, to the ligamentous termination of the appendix 
of the epiglottis, and at the apex to the aryteno-epiglottideus 
muscle. 
The cuneiform cartilages , or the appendages of the arytenoid 
cartilages, consist of elongated, pointed, and falciform masses of 
dense yellow elastic tissue and fibro-cartilage, placed on the apex 
of either arytenoid cartilage. Their base is firmly amalgamated 
with the apices of the arytenoids, and their points extending upwards 
and backwards, and overlapping these cartilages, thus elongate the 
superior angle of the chink of the larynx in the form of the spout 
of a pitcher, from whence the name arytenoid has been derived. 
To their anterior edge is attached the aryteno-epiglottidean fold of 
mucous membrane, and which also expands over their outer sur- 
