Preferred Label : inferior ischial ramus;
Uberon definition : The Inferior Ramus of the ischium (ascending ramus) is the thin, flattened part of
the ischium, which ascends from the superior ramus, and joins the inferior ramus of
the pubisbthe junction being indicated in the adult by a raised line. The outer surface
is uneven for the origin of the obturator externus and some of the fibers of the adductor
magnus; its inner surface forms part of the anterior wall of the pelvis. Its medial
border is thick, rough, slightly everted, forms part of the outlet of the pelvis,
and presents two ridges and an intervening space. The ridges are continuous with similar
ones on the inferior ramus of the pubis: to the outer is attached the deep layer of
the superficial perineal fascia (fascia of Colles), and to the inner the inferior
fascia of the urogenital diaphragm. If these two ridges be traced downward, they will
be found to join with each other just behind the point of origin of the transversus
perinC&i; here the two layers of fascia are continuous behind the posterior border
of the muscle. To the intervening space, just in front of the point of junction of
the ridges, the transversus perinC&i is attached, and in front of this a portion of
the crus penis vel clitoridis and the ischiocavernosus. Its lateral border is thin
and sharp, and forms part of the medial margin of the obturator foramen.;
Uberon related term : inferior rami of the pubis; inferior ramus of ischium;
Origin ID : 0014443;
Automatic exact mappings (from CISMeF team)
- Uberon cross reference
- has part
- part of
The Inferior Ramus of the ischium (ascending ramus) is the thin, flattened part of
the ischium, which ascends from the superior ramus, and joins the inferior ramus of
the pubisbthe junction being indicated in the adult by a raised line. The outer surface
is uneven for the origin of the obturator externus and some of the fibers of the adductor
magnus; its inner surface forms part of the anterior wall of the pelvis. Its medial
border is thick, rough, slightly everted, forms part of the outlet of the pelvis,
and presents two ridges and an intervening space. The ridges are continuous with similar
ones on the inferior ramus of the pubis: to the outer is attached the deep layer of
the superficial perineal fascia (fascia of Colles), and to the inner the inferior
fascia of the urogenital diaphragm. If these two ridges be traced downward, they will
be found to join with each other just behind the point of origin of the transversus
perinC&i; here the two layers of fascia are continuous behind the posterior border
of the muscle. To the intervening space, just in front of the point of junction of
the ridges, the transversus perinC&i is attached, and in front of this a portion of
the crus penis vel clitoridis and the ischiocavernosus. Its lateral border is thin
and sharp, and forms part of the medial margin of the obturator foramen.
