Content
Introduction 0:00
Division of the Abdominal Muscles 0:08
Quadratus Lumborum 1:27
Pyramidalis 1:53
Rectus Abdominis 2:22
Transverse Abdominal Muscle 2:52
Internal Oblique 3:49
Cremaster Muscle 4:21
External Oblique 5:00


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Muscles of the Abdomen
Lateral Group
○ External Oblique
○ Internal Oblique
○ Transverse Abdominal
Anterior Group
○ Rectus Abdominis
○ Pyramidalis
Posterior Group
○ Quadratus Lumborum

Posterior Group:
Quadratus Lumborum
musculus wadratus lumborum
Origin:
Iliac Crest
Iliolumbar Ligament
Insertion:
12th Rib
Costal process of L1L4
Function:
Extension of trunk
(Bilteral Contraction)
Lateroflexion of trunk
(Unilateral Contraction)

Anterior Group:
Pyramidalis
musculus pyramidalis
O: Superior Pubic Ramus
I: Linea Alba
F:
Tenses linea alba and strengthens the rectus sheath

Rectus Abdominis
musculus rectus abdominis
O:
Xiphoid Process
Costal Cartilage of 5th – 7th Rib
I:
Body of Pubis between pubic symphysis and pubic tubercle
F:
Ventral Flexion of Trunk
Expiration Muscle

Lateral Group
Transverse Abdominal
musculus transversus abdominis
O:
Inguinal ligament
Iliac Crest
Thoracolumbar Fascia
7th – 12th Rib
I: Linea Alba
F:
Rotation of the trunk
Expiration Muscle

Internal Oblique
musculus obliquus internus abdominis
O:
Inguinal ligament
Iliac Crest
Thoracolumbar Fascia
I:
Linea Alba
10th – 12th Rib
F:
Ventral flexion of trunk (Bilateral Contraction)
Tilts the trunk to the side
(Unilateral Contraction)
Expiration Muscle

Cremaster
musculus cremaster
Formed by Internal Oblique and Transverse Abdominal Muscles

External Oblique
musculus obliquus externus abdominis
O: 5th – 12th Ribs
I:
Linea Alba
Iliac Crest
F:
Ventral flexion of trunk (Bilateral Contraction)
Tilts the trunk to the side
(Unilateral Contraction)
Expiration Muscle