THE 
VETEKIJVARIAN. 
VOL. I. 
MAY, 1828 . 
N®. 5. 
ANATOMY OF THE HORSE. 
(ColUinuwl from page 113.) 
OF THE PELVIS IN GENERAL. 
» 
DIVISION, Into exterior and interior, inlet and outlet. 
The Exterior oresents—in front, the crest and anterior and 
posterior spines of the ileum ; behind, the divergent tuberosities 
of the ischium ; on the sides, the triangular planes of the ilea 
which are clothed by the gluteal muscles, the acetabula, and 
between them and the ischiatic tuberosities the rounded smooth 
surfaces of the ischia over which play the rotating muscles of 
the haunch; above, the sacrum; below, the symphyses of the 
pubes and ischia ; laterally and inferiorly, between the symphy¬ 
ses and the acetabula, the foramina obturatoria. 
The Interior is divided into two compartments by a prominent 
circumferent line forming the brim of the pelvis: the open irre¬ 
gular space before this line is the inlet or entry ; behind it com¬ 
mences the cavity of the pelvis, which again is bounded poste¬ 
riorly'by the outlet. The lateral walls of the cavity are formed 
principally by the ilea; the ischia and pubes, united at their 
symphyses, including the obturator foramina, are mostly con¬ 
sumed in completing the cavity below; while the sacrum alone 
constitutes the superior boundary. The supero-inferior diameter 
of the brim in the young subject exceeds the lateral; in the 
adult mare these two diameters, and also the antero-posterior 
length of the cavity, measuring froi^ the brim to the extreme 
points of the ischiatic tuberosities, are about equal—about ten 
inches. 
The Inlet displays—laterally, the ilea with thin projecting 
anterior spinous processes; superiorly, the promontory of the 
sacrum and the sacro-iliac articulations; inferiorly, the grooves 
for the psoas and iliacus and the symphysis pubis. 
-VoL. I.—No. 5. Q 
