8. +The rectus abdominis
attaches from the pubic
bone to the sternum and
the costal cartilages of ribs
5 through 7.
• flexes and laterally flexes
the trunk at the spinal
joints.
• It posteriorly tilts the pelvis
at the lumbosacral joint.
• also compresses the
abdominal contents.
9. 1.The rectus abdominis is encased in
the rectus sheath, which is created
by the fibrous midline attachments
of the other three anterior
abdominal wall muscles: external
abdominal oblique, internal
abdominal oblique, and transversus
abdominis.
2.The rectus abdominis has
horizontal fibrous bands known
as tendinous inscriptions, which
divide each rectus abdominis into
four boxes.
18. +the widest muscle in the
human body
+able to pull the inferior
angle of the scapula in
various directions
+producing movements
on the shoulder joint;
internal rotation,
adduction and extension
of the arm.
