516 RESPIRATORY SYSTEM OF THE HORSE 
thyroid cornu of the hyoid bone; below it is a notch (Fissura thyreoidea), which is 
converted into a foramen (Foramen thyreoideum) by a fibrous band, and trans- 
mits the anterior laryngeal nerve to the interior of the larynx. The posterior cornu 
(Cornu aborale) articulates with the cricoid cartilage. The ventral border joins 
the body in front, and behind diverges 
from its fellow to inclose a triangular Body 
space, the thyroid notch (Incisura thy- : 
reoidea aboralis), which is occupied by 
the crico-thyroid membrane. The anter- 
Median ridge Lamina 
Thyroid 
notch 
Lamina 
Anterior 
cornu 
Facet for 
arytenoid Racet for 
thyroid 
Thyroid 
foramen 
Posterior 
border 
Arch 
Anterior 
border 
Posterior cornu 
Surface for 
cricotd 
Fic. 458.—Cricor CartitaGe or Horse; Lerr ANTERO- Fic, 459.—Tuyroiw CartiLtaGe Or Horse; VENTRAL 
LATERAL VIEW. View. 
ior border is slightly convex, and is attached to the hyoid bone by the thyro-hyoid 
membrane. The posterior border overlaps the arch of the cricoid cartilage, and 
Pier accel suriace Medial angle of base Apex 
Lateral 
border 
Oral sur- Facet 
face _ for 
cricoid 
Base 
Cuneiform process Vocal process 
Fic. 460.—Epiciorric CartitaGe or Horse; Ricstr Fig. 461.—Lerr Aryrenor CARTILAGE oF Horse; 
Laverat View. Mep10-VENTRAL VIEW. 
2 
gives attachment to the crico-thyroid muscle. The medial surface is concaye, 
and is partly covered by mucous membrane. 
The epiglottic cartilage (Cartilago epiglottica), usually called the epiglottis for 
the sake of brevity, is situated above the body of the thyroid cartilage and curves 
