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The external oblique functions to pull the chest downwards and compress the abdominal cavity, which increases the intra-abdominal pressure as in a Valsalva maneuver.It also performs ipsilateral (same side) side-bending and contralateral (opposite side) rotation: the right external oblique would side-bend to the right and rotate to the left, and vice versa.
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.
As intercostal nerves course along with their adjacent ribs, they give off a number of muscular branches to supply - Internal intercostals - External intercostalis - Innermost intercostals - Serratus posterior - Transversus thoracic - transverse abdominalis - Internal abdominal oblique - External abdominal oblique - Rectus adbominus
Damage to the trochlear nerve (IV) can also cause double vision with the eye adducted and elevated. [15] The result will be an eye which can not move downwards properly (especially downwards when in an inward position). This is due to impairment in the superior oblique muscle. [14] Damage to the abducens nerve (VI) can also result in double ...
Secondly, its contraction causes ipsilateral rotation and side-bending. It acts with the external oblique muscle of the opposite side to achieve this torsional movement of the trunk. For example, the right internal oblique and the left external oblique contract as the torso flexes and rotates to bring the left shoulder towards the right hip.
external spermatic fascia, an extension of the innominate fascia that overlies the aponeurosis of the external oblique muscle. [1] cremasteric muscle and fascia, formed from a continuation of the internal oblique muscle and its fascia. [1] internal spermatic fascia, continuous with the transversalis fascia. [1]
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.
The cremaster muscle is innervated from the sensory and motor fibers of the genitofemoral nerve that originates from the L1 and L2 spinal nerve nuclei. It receives distinctly different innervation and vascular supply in comparison to the internal oblique.