The Vertebrate SkeletonReynolds, Sidney H. (Sidney Hugh)
Science
The Vertebrate Skeleton
Reynolds, Sidney H. (Sidney Hugh)
Skeleton
In UNGULATA VERA the pelvis is generally rather long and narrow. The
ilium is flattened and expanded in front (fig. 103, 8), but becomes
much narrower and more cylindrical before reaching the acetabulum.
Both pubis and ischium contribute to the symphysis which is often very
long. The ischia are large and have prominent tuberosities, especially
in Artiodactyles. In most Ruminantia there is a deep depression, the
supra-acetabular fossa above the acetabulum, but this is not found in
the Suina or Tylopoda.
SUBUNGULATA. In _Procavia_ the pelvis is long and narrow, and bears
resemblance to that in Artiodactyles.
The Proboscidea have a very large pelvis set nearly at right angles to
the vertebral column; the ilium is very wide, having expanded iliac[1]
and gluteal[1] surfaces, and a narrow sacral[176] surface. The pubes
and ischia are rather small, but both meet their fellows in the
symphysis. _Uintatherium_ (suborder Amblypoda) also has a large and
vertically placed pelvis (fig. 108) with a much expanded ilium. The
pelvis however differs from that of the Proboscidea in the fact that
the ischia do not meet in a ventral symphysis.
In many RODENTIA the ilia have their gluteal, iliac, and sacral
surfaces of nearly equal extent; in the Hares, however, the gluteal
and iliac surfaces are confluent. The pubes and ischia are always well
developed and sometimes, as in the Hares, the acetabular bone also. In
these animals the pubis does not take part in the formation of the
acetabulum, and the ischium bears on its outer side a well-marked
ischial tuberosity.
In the CARNIVORA the pelvis is long and narrow. The iliac surfaces
(fig. 78, A, 5) are very small and the sacral large; the crest or
supra-iliac border is formed by the union of the sacral and gluteal
surfaces. The symphysis is long and includes part of both pubis and
ischium. The ischial tuberosity (fig. 78, A, 10) is often well marked,
and sometimes as in _Viverra_ the acetabular bone is distinct. In the
Pinnipedia the pelvic symphysis is little developed, or sometimes not
developed at all, and the obturator foramina are remarkably large.
In some INSECTIVORA such as _Galeopithecus_, there is a long pelvic
symphysis, in others such as _Erinaceus_ and _Centetes_, it is very
short, in others again such as _Talpa_ and _Sorex_, there is no pelvic
symphysis. The acetabular bone is exceptionally large in _Talpa_ and
_Sorex_.
In CHIROPTERA the pelvis is small and narrow, and in the great
majority of cases the two halves do not meet in a ventral symphysis.
The pubis has a strongly developed pectineal process, which
occasionally unites with a process from the ilium enclosing a large
pre-acetabular foramen.
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