What is the origin and insertion of internal oblique?
From these points of origin, the internal oblique runs diagonally up the side of the body and inserts onto the costal cartilage of the eighth through twelfth ribs and the linea alba. The internal oblique has several different actions, including: Flexion of the trunk: bending the trunk forward.
Where is the external oblique found?
The external oblique muscle is one of the outermost abdominal muscles, extending from the lower half of the ribs around and down to the pelvis.
What is the origin insertion and action of the diaphragm?
Origin and insertion
The diaphragm is a musculotendinous structure with a peripheral attachment to a number of bony structures. It is attached anteriorly to the xiphoid process and costal margin, laterally to the 11th and 12th ribs, and posteriorly to the lumbar vertebrae.
What is the origin of the transverse abdominis?
The transversus abdominis has several origin points: Lateral one-third of the superior surface of the inguinal ligament and the associated iliac fascia. Anterior two-thirds of the inner lip of iliac crest. Thoracolumbar fascia between the iliac crest and the 12th rib.
Where are the internal and external obliques?
Origin. The internal obliques originate on the inguinal ligament, which is a ligament that runs from the anterior iliac spine to the pubic bone. Additionally they originate on the anterior iliac crest. The external obliques, however, originate on the lower eight ribs.
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 is the movement of the external oblique?
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.
What is the origin insertion and action of the rectus abdominis?
Rectus abdominis muscle. Origin – Pubic symphysis, Pubic crest. Insertion – Xiphoid process, Costal cartilages of ribs 5-7. Innervation – Intercostal nerves (T6-T11), Subcostal nerve (T12) Function – Trunk flexion, Compresses abdominal viscera, Expiration.
What is the aponeurosis of external oblique?
The aponeurosis of the external oblique runs down the center of the abdomen, starting at the bottom of the ribs and ending at the pubis. It’s part of the sheath of the rectus abdominis and runs crosswise to attach the obliques to the other abdominal muscles.
How is the aponeurosis of external oblique arranged?
The aponeurosis of the external oblique was formed of two layers: superficial and deep. The fibres of each layer were perpendicular to those of the other layer. The fibres of the deep layer were the direct continuation of the fleshy bundles of the external oblique muscle and extended downwards and medially.
Where is the external oblique ridge?
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 the origin of latissimus dorsi?
Origin of the latissimus dorsi is from spinous processes of thoracic T7–T12, thoracolumbar fascia, iliac crest and inferior 3 or 4 ribs, inferior angle of scapula and insertion on floor of intertubercular groove of the humerus.
What is crus of diaphragm?
The crus of diaphragm (pl. crura), refers to one of two tendinous structures that extends below the diaphragm to the vertebral column. There is a right crus and a left crus, which together form a tether for muscular contraction. They take their name from their leg-shaped appearance – crus meaning leg in Latin.
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