Muscle | Origin | Insertion | Blood Supply | Innervation |
External Oblique m | External surface and inferior border of lower 8 ribs; Anterior 1/2 of outer lip of ant. iliac crest; Anterior aponeurosis from 9th costal cartilage to below umbilicus | | (SPLS) Superior and inferior epigastric; posterior lumbar; lower post. intercostal and subcostal; superficial & deep circumflex iliac | Terminal branches of ventral rami T7-T12 via lower intercostal and subcostal n |
Internal Oblique m. | Inferior borders & tips of lower 4 ribs; Thoracolumbar fascia; Ant 2/3 of intermediate line of ant. iliac crest; Lateral 2/3 upper surface of inguinal lig; crest and medial part of pectineal line; ant aponeurosis to cartilages of ribs 7-9 | | SPLS | Terminal branches of ventral ramus of T7-T12; Ilioinguinal & iliohypogastric L1 |
Transversus Abdominis | Internal aspects of lower 6 costal cartilages; thoracolumbar fascia between iliac crest & 12th rib; ant. 2/3 of inner lip of ant iliac crest; Lateral 2/3 of inguinal lig; pubic crest and pectineal line; aponeurosis to linea alba | | SPLS | Same as internal Oblique |
Quadratus Lumborum m. | Iliolumbar ligament and adjacent portion of iliac crest | Medila 1/2 of lower border of 12th rib; Apices of transverse processes of L1-L4 | (ALBS) Arteria lumbalis ima; lumbar br of iliolumbar; br of lumbar; subcostal | Ventral rami of T12-L4 |
Cremaster m | Inferomedial border of internal olblique and TA;
Middle of inguinal lig | Pubic tubercle and lateral pubic crest | Cremastic a from inferior epigastric a | Genital br. of genitofemoral n.
L1,L2 |
Pyramidalis m | Front of pubis and ligamentous fibers in front of symphysis | Linea alba between umbilicus and pubis | Inferior epigastric a;
Deep circumflex iliac a | Terminal branches of ventral ramus of T12 via subcostal |
Rectus abdominis m | Costal cartilage 5-7; crest of pubis; Contralateral m. at linea alba | | Superior and inferior epigastric a; branch from posterior lumbar; lower posterior intercostal; subcostal | Terminal branches of ventral rami of T6-T12 via lower intercostal and subcostal |