External Oblique Origin And Insertion And Action

Angle of the 9th rib blending with serratus anterior and from the angles of the 10th 11th and 12th ribs blending with latissimus dorsi. The external intercostal muscles consist of 11 pairs of muscles.

Abdominal Internal Oblique Muscle Wikipedia

Origin insertion action innervation.

External oblique origin and insertion and action. Find out why as well as the action and origin of this muscle by reading the rest of this lesson. From these ribs the external obliques then. 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.

Origin and insertion external abdominal oblique muscle originates from the external surfaces of ribs 5 12. External surfaces of ribs 5 12. Supports abdominal wall assists forced expiration aidsraising intraabdominal pressure and with muscles of opposite side abductsand rotates trunk.

Attachments of external oblique muscle. Every external intercostal originates from the sharp inferior costal border of one rib. Outer anterior half of the iliac crest the inguinal ligament the pubic tubercle and crest and the aponeurosis of the anterior rectus sheath.

Origin insertion the external obliques originate from the outer part of the fifth through twelfth ribs on each side of the rib cage. The transversus abdominis is a broad paired muscular sheet found on the lateral sides of the abdominal wall along with the external abdominal oblique and the internal abdominal oblique it comprises the lateral abdominal muscles combined with the two anterior abdominal muscles rectus abdominis and pyramidalis these muscles make up the anterolateral abdominal wall. The attaching fibers interdigitate with those of serratus anterior and latissimus dorsi forming a zig zag oblique line on the lateral side of thorax.

Outer anterior half of iliac crest inguinal lig publictubercle and crest and aponeurosis of anterior rectus sheath. Internal abdominal oblique is a broad thin muscular sheet found on the lateral side of the abdomen going from superficial to deep the external abdominal oblique internal abdominal oblique and transversus abdominis comprise the three distinct layers of the lateral abdominal wall. In most humans especially females the oblique is not visible due to subcutaneous fat deposits and the small size of the muscle.

Anterior angles of lower eight ribs. Anterior iliac crest and abdominal aponeurosis to linea alba. As its name suggests the direction of its fibers are obliquely oriented perpendicular to those of the external.

The internal oblique is very important muscle when celebrating your birthday. The fibers of each muscle course inferomedially and insert along the outer lip of the superior border of the immediate rib below.

External And Internal Oblique Muscles