internal oblique muscle
The internal oblique muscle is a broad, thin, muscular sheet that lies deep
to the external oblique;
the majority of its fibers run at right angles to those of the external
oblique. It arises from the lumbar fascia, the anterior two-thirds of the
iliac crest, and the lateral two-thirds of the inguinal ligament. The muscle
fibers radiate as they pass upward and forward. The muscle is inserted into
the lower borders of the lower three ribs and
their costal cartilages, the xiphoid
process, the linea alba, and the symphis pubis. The internal oblique has
a lower free border that arches over the spermatic cord (or round ligament
of the uterus) and then descends behind it
to be attached to the pubic crest and the pectineal line. Near their insertion,
the lowest tendinous fibers are joined by similar fibers from the transverse
abdominis to form the conjoint tendon. The conjoint tendon
is attached medially to the linea alba, but it has a lateral free border.
As the spermatic cord (or round ligament of the uterus) passes under the
lower border of the internal oblique, it carries with it some of the muscle
fibers that are called the cremaster muscle. The cremaster
fascia is the term used to describe the cremaster muscle and its
fascia.
Related category
• ANATOMY
AND PHYSIOLOGY
Also on this site:
Encyclopedia
of Alternative Energy & Sustainable Living
Encyclopedia
of History
BACK TO TOP
|
