- Abdominal external oblique muscle
Abdominal external oblique muscle Muscles of the trunk. The Obliquus externus abdominis. Latin m. obliquus externus abdominis Gray's subject #118 409 Origin Lower 8 costae Insertion Iliac crest, Inguinal ligament, linea alba Artery Nerve lower 6 intercostal nerve + subcostal nerve Actions Rotates torso
The external oblique muscle (of the abdomen) (also external abdominal oblique muscle) is the largest and the most superficial (outermost) of the three flat muscles of the lateral anterior abdomen.
The external oblique is situated on the lateral and anterior parts of the abdomen. It is broad, thin, and irregularly quadrilateral, its muscular portion occupying the side, its aponeurosis the anterior wall of the abdomen. In most humans (especially females), the oblique is not visible, due to subcutaneous fat deposits and the small size of the muscle.
It arises from eight fleshy digitations, each from the external surfaces and inferior borders of the fifth to twelfth ribs. These digitations are arranged in an oblique line which runs inferiorly and anteriorly, with the upper digitations being attached close to the cartilages of the corresponding ribs, the lowest to the apex of the cartilage of the last rib, the intermediate ones to the ribs at some distance from their cartilages.
The five superior serrations increase in size from above downward, and are received between corresponding processes of the serratus anterior muscle; the three lower ones diminish in size from above downward and receive between them corresponding processes from the latissimus dorsi. From these attachments the fleshy fibers proceed in various directions.
Those from the lowest ribs pass nearly vertically downward, and are inserted into the anterior half of the outer lip of the iliac crest; the middle and upper fibers, directed downward (inferiorly) and forward (anteriorly), become aponeurotic at approximately the midclavicular line. This aponeurosis formed from fibres from either side of the external oblique decussates at the linea alba.
Just deep to the external oblique is the internal oblique muscle.
The external oblique muscle is innervated by ventral branches of the lower 6 intercostal (thoracoabdominal) nerves and the subcostal nerve on each side.
The cranial portion of the muscle is supplied by the lower intercostal arteries, whereas the caudal portion is supplied by a branches of either the deep circumflex iliac artery or the iliolumbar artery.
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 has limited actions in both flexion and rotation of the vertebral column. One side of the obliques contracting can create lateral flexion. It also contributes in compression of abdomen.
Femoral sheath laid open to show its three compartments.
- Layers of the abdominal wall
- Abdominal exercise
List of muscles of abdominopelvic cavity (TA A04.5, GA 4.408) Abdomen/
lateralMuscleFasciaInguinal ligament (Pectineal ligament, Lacunar ligament, Reflected ligament)PosteriorMuscleFascia
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abdominal external oblique muscle — noun a diagonally arranged abdominal muscle on either side of the torso • Syn: ↑external oblique muscle, ↑musculus obliquus externus abdominis, ↑oblique • Derivationally related forms: ↑oblique (for: ↑oblique) … Useful english dictionary
Abdominal internal oblique muscle — Muscles of the trunk … Wikipedia
external oblique muscle — noun a diagonally arranged abdominal muscle on either side of the torso • Syn: ↑musculus obliquus externus abdominis, ↑abdominal external oblique muscle, ↑oblique • Derivationally related forms: ↑oblique (for: ↑oblique) … Useful english dictionary
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external oblique — noun : a chiefly subcutaneous sheet of diagonally arranged abdominal muscle on each side of the trunk … Useful english dictionary
Superior oblique muscle — Superior oblique Rectus muscles: 2 = superior, 3 = inferior, 4 = medial, 5 = lateral Oblique muscles: 6 = superior, 8 = inferior Other muscle: 9 = levator palpebrae superioris … Wikipedia
Oblique — may refer to: Oblique angle, in geometry, an angle that is not a multiple of 90 degrees Oblique angle, synonym for Dutch angle, a cinematographic technique Oblique (album), by jazz vibraphonist Bobby Hutcherson Oblique banded rattail, a fish also … Wikipedia
Muscle oblique externe de l'abdomen — Le muscle oblique externe de l abdomen ou grand oblique ou tout simplement muscle oblique externe (en latin Musculus obliquus externus abdominis) est un muscle large de la paroi latérale de l abdomen. Il est pair et symétrique. Sommaire … Wikipédia en Français
abdominal — I noun the muscles of the abdomen • Syn: ↑abdominal muscle, ↑ab • Hypernyms: ↑skeletal muscle, ↑striated muscle • Hyponyms: ↑ … Useful english dictionary
abdominal muscle — noun the muscles of the abdomen • Syn: ↑abdominal, ↑ab • Hypernyms: ↑skeletal muscle, ↑striated muscle • Hyponyms: ↑external oblique muscle, ↑ … Useful english dictionary