External abdominal oblique is a paired muscle located on the lateral sides of the abdominal wall.
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External abdominal oblique muscle.
| Origin | External surfaces of ribs 5-12 |
|---|---|
| Insertion | Linea alba, pubic tubercle, anterior half of iliac crest |
Which is a part of the insertion of the internal oblique?
The internal oblique inserts onto the costal cartilages of the eighth through twelfth ribs and the linea alba. Costal cartilage is the section of cartilage that extends from front ends of the ribs, and the linea alba (Latin for ‘white line’) is a band of connective tissue that runs up the middle of the abdomen.
What is the origin of the external oblique?
The external oblique muscle arises from the outer surface of the middle of the shaft of the lower eight ribs as fleshy fibers. At its origin upper four slips and lower four slips interdigitate with the serratus anterior and the latissimus dorsi muscles respectively.
Which of the following is an action of the external oblique?
Function. The external obliques on either side: Help rotate the trunk. Bilateral contraction of EO along with rectus abdominis and internal oblique flexes the trunk by drawing the pubis towards the xiphoid (like in crunches or sit-ups)
On what part of the body is the external oblique located?
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.
What is the insertion of the rectus abdominis?
Rectus abdominis muscle
| Origin | Pubic symphysis, pubic crest |
|---|---|
| Insertion | Xiphoid process, costal cartilages of ribs 5-7 |
| Innervation | Intercostal nerves (T7-T11), subcostal nerve (T12) |
| Blood supply | Inferior epigastric and superior epigastric arteries; contributions from posterior intercostal, subcostal and deep circumflex arteries |
What is the origin and insertion of internal oblique?
Lateral fibers: originate from the anterior two-thirds of iliac crest and then diverge superiorly and medially. The fibers then extend into an aponeurosis that contributes to the formation of the rectus sheath and inserts at the linea alba.
Where is the external oblique ridge?
mandible
External oblique ridge – The external oblique ridge or line is the bony anterior border of the ramus located on the outer aspect of the mandible. This ridge has a downward diagonal course and is seen on most mandibular molar periapicals and molar bitewings.
What is an external oblique?
The external oblique muscles are located on the outer surface of the sides of the abdomen, on each side of the rectus abdominis. The muscles extend from the lower ribs to the pelvis. The external oblique muscles are responsible for the twisting of the trunk.
What Innervates the external oblique?
The external oblique abdominal muscle is innervated by motor branches of the lateral cutaneous branches of the anterior spinal nerves in a segmental pattern. With the exception of the subcostal nerve the motor branches enter the outer surface of the muscle digitation arising from the rib above.
What Innervates internal oblique?
The internal oblique is innervated by both the lower intercostal nerves as well as branches of the lumbar plexus (iliohypogastric nerve and ilioinguinal nerve).
