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Glossary of Anatomy Abdominal

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External abdominal oblique
O: Lower ribs
I: Aponeurosis inserts into linea alba
A: Compresses abdomen, flexes and laterally rotates spine contralaterally (to opposite side), and depress ribs
N: Lower Intercostal nerves (that means thoracic spinal nerves), Iliohypogastric, Ilioinguinal nerves
Internal abdominal oblique
O: inguinal ligament; iliac crest; thoracolumbar fascia (aponeurosis)
I: Lower border of lower ribs; with aponeurosis; pubis, pectineal line
A: Compresses abdomen, flexes and laterally rotates spine contralaterally (to opposite side), and depress ribs
N: Lower Intercostal nerves (that means thoracic spinal nerves), Iliohypogastric, Ilioinguinal nerves
Transversus abdominis
O: inguinal ligament & Iliac crest; thoracolumbar fascia; cartilages of lower ribs
I: via the aponeurosis to linea alba, pubis and pectineal line
A: Compresses abdomen, depresses ribs
N: lower intercostal nerves
Rectus abdominis
O: Crest of pubis; interpubic ligament
I: Cartilages of ribs 5-7, Xiphoid process
A: Compresses abdomen, Flexes spine
N: Intercostal nerves 7-12
Quadratus lumborum
O: Iliolumbar ligament & posterior iliac crest
I: 12th rib, tips of transverse processes L1-L4
A: Fixes last 2 ribs, flexes spine laterally
N: T12, L1
Seen in posterior abdominal wall
Psoas major
O: Transverse processes of L1-L5; sides of the vertebral bodies and fibrocartilage of T12- L5
I: Lesser trochanter of femur
A: Flexes thigh and rotates it laterally; flexes spine and bends spine laterally
N: L2-L3
Illiacus
O: Upper iliac fossa; iliac crest; anterior sacroiliac ligament and base of sacrum
I: Tendon of Psoas muscle and directly to lesser trochanter
A: Flexes and laterally rotates thigh
N: Femoral nerve (L2- L3)
(Note the relationship of the femoral nerve to the Psoas and Iliacus)
Linea Alba
Several Aponeurosis connect here
Runs from the zyphoid to the pubis
Fascia
Deep - dense CT; ensheathes muscle and organs
Superficial - loose areolar; subcutaneous
Rectus Sheath
formed by the aponeurosis of all three abdominal muscles
Below acruate line - prevents possiblity of 8 pack; All of the aponeurosis are anterior t
Above acruate line - The external abdominal oblique aponeurosis is above; the internal abdominal oblique sheath wraps anterior and posterior, and the transverse abdominus wraps posterior arount the rectus abdominus sheath
Diaphragm
Origin Vert Column and Ribs
Helps in urintation and defecation; breathing

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