OBTURATOR INTERNUS MUSCLE: 3D ANATOMY
Obturator Internus Muscle
Today we will discuss the important muscle of the lateral pelvic wall, known as obturator
internus. This fan-shaped muscle originates within the pelvis and leaves the pelvic cavity
through the lesser sciatic foramen. It is a lateral rotator and abductor of the femur and
stabilises the hip joint from the posterior side.
Origin and Insertion
The obturator internus muscle arises from the inner side of the obturator membrane and
adjoining bones surrounding the obturator membrane. It converges into a thin tendon that
turns almost at a right angle at the lesser sciatic notch, crosses the posterior aspect of the
hip joint, and ultimately inserts into the medial surface of the greater trochanter of the femur.
Obturator Fascia and Tendinous Arch
The obturator fascia is a feature on the inner side of the obturator membrane. It provides
origin to a muscle known as levator ani, an important muscle of the pelvic diaphragm. The
tendinous arch, a feature of the obturator fascia, is a cushion for the exam and provides
origin to levator ani.
Difference Between Obturator Fascia and Obturator Membrane
The obturator membrane closes the obturator foramen and gives origin to the obturator
externus muscle on its outer surface. To see the obturator membrane, one must first remove
the obturator externus muscle.
Understanding Obturator Internus Muscle and Fascia
The obturator internus muscle is located in the lateral pelvic wall and covered by the
obturator fascia on the inner side. The fascia has a thick band known as the white line or
tenderness arch, which gives origin to the levator ani muscle. This arch divides the obturator
internus into two parts, with the area above the levator becoming part of the pelvis and the
area below becoming part of the perineum. The muscle is a lateral rotator when the foot is
on the ground and causes abduction when the thigh is flexed.
Anatomy of the Obturator Internus
The obturator internus muscle is covered by the obturator fascia on the inner side and the
obturator membrane on the outer side.
The obturator fascia is a covering on the pelvic side and gives origin to the levator ani
muscle through the tenderness arch.
The tenderness arch is a thickening of the fascia and extends from the body of the pubis to
the ischial spine.
The muscle extends from the pelvic surface on the inner side and the obturator membrane
on the outer surface.
Importance of Obturator Internus Fascia
The obturator fascia is a covering on the inner side of the obturator internus muscle.
The fascia is modified to form the tenderness arch which gives origin to the levator ani
muscle.
Obturator Internus Muscle
Today we will discuss the important muscle of the lateral pelvic wall, known as obturator
internus. This fan-shaped muscle originates within the pelvis and leaves the pelvic cavity
through the lesser sciatic foramen. It is a lateral rotator and abductor of the femur and
stabilises the hip joint from the posterior side.
Origin and Insertion
The obturator internus muscle arises from the inner side of the obturator membrane and
adjoining bones surrounding the obturator membrane. It converges into a thin tendon that
turns almost at a right angle at the lesser sciatic notch, crosses the posterior aspect of the
hip joint, and ultimately inserts into the medial surface of the greater trochanter of the femur.
Obturator Fascia and Tendinous Arch
The obturator fascia is a feature on the inner side of the obturator membrane. It provides
origin to a muscle known as levator ani, an important muscle of the pelvic diaphragm. The
tendinous arch, a feature of the obturator fascia, is a cushion for the exam and provides
origin to levator ani.
Difference Between Obturator Fascia and Obturator Membrane
The obturator membrane closes the obturator foramen and gives origin to the obturator
externus muscle on its outer surface. To see the obturator membrane, one must first remove
the obturator externus muscle.
Understanding Obturator Internus Muscle and Fascia
The obturator internus muscle is located in the lateral pelvic wall and covered by the
obturator fascia on the inner side. The fascia has a thick band known as the white line or
tenderness arch, which gives origin to the levator ani muscle. This arch divides the obturator
internus into two parts, with the area above the levator becoming part of the pelvis and the
area below becoming part of the perineum. The muscle is a lateral rotator when the foot is
on the ground and causes abduction when the thigh is flexed.
Anatomy of the Obturator Internus
The obturator internus muscle is covered by the obturator fascia on the inner side and the
obturator membrane on the outer side.
The obturator fascia is a covering on the pelvic side and gives origin to the levator ani
muscle through the tenderness arch.
The tenderness arch is a thickening of the fascia and extends from the body of the pubis to
the ischial spine.
The muscle extends from the pelvic surface on the inner side and the obturator membrane
on the outer surface.
Importance of Obturator Internus Fascia
The obturator fascia is a covering on the inner side of the obturator internus muscle.
The fascia is modified to form the tenderness arch which gives origin to the levator ani
muscle.
