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The internal oblique performs two major functions. Firstly as an accessory muscle of respiration, it acts as an antagonist (opponent) to the diaphragm, helping to reduce the volume of the chest cavity during exhalation. When the diaphragm contracts, it pulls the lower wall of the chest cavity down, increasing the volume of the lungs which then ...
The lateral cutaneous branch ("iliac branch") pierces the internal oblique muscles and the external oblique muscles immediately above the iliac crest. [4] It is distributed to the skin of the gluteal region, behind the lateral cutaneous branch of the subcostal nerve; the size of this branch bears an inverse proportion to that of the lateral cutaneous branch of the subcostal nerve.
The ilioinguinal nerve then perforates the transversus abdominis near the anterior part of the iliac crest, and communicates with the iliohypogastric nerve between the transversus and the internal oblique muscle. It then pierces the internal oblique muscle, distributing filaments to it, and then accompanies the spermatic cord (in males) or the ...
The external oblique, closest to the surface, extend inferiorly and medially, in the direction of sliding one’s four fingers into pants pockets. Perpendicular to it is the intermediate internal oblique, extending superiorly and medially, the direction the thumbs usually go when the other fingers are in the pants pocket. The deep muscle, the ...
A posterior rectus sheath composed of the posterior portion of the aponeurosis of the internal oblique muscle and the aponeurosis of the transversus abdominis passes behind the rectus abdominis muscle. [2] [3] All aponeuroses of the rectus sheath unite at (and and decussate across) the midline, forming the linea alba. [3] Below the arcuate line
Muscle Location Origin Insertion Artery Nerve Action Antagonist O TA occipitalis: ... linea alba, aponeurosis of internal oblique muscle, pubic crest:
Several muscles in the human body may be referred to as an oblique muscle: Abdominal wall Abdominal external oblique muscle; Abdominal internal oblique muscle; Extraocular muscles Inferior oblique muscle; Superior oblique muscle; Oblique muscle of auricle, part of the outer ear
The conjoint tendon (previously known as the inguinal aponeurotic falx) is a sheath of connective tissue formed from the lower part of the common aponeurosis of the abdominal internal oblique muscle and the transversus abdominis muscle, joining the muscle to the pelvis. It forms the medial part of the posterior wall of the inguinal canal.