OIAI V Abdominal Wall and Pelvis

External Oblique Origin

Lateral surfaces of ribs 6-12

External Oblique Insertion

Iliac crest, ASIS, pubis, linea alba as aponeurosis

External Oblique Action

Unilateral: Contralateral rotation, ipsilateral sidebend

Bilateral: Trunk Flexion

External Oblique Innervation

Ventral rami of corresponding levels

Internal Oblique Origin

Thoracolumbar fascia, iliac crest, inguinal ligament

Internal Oblique Insertion

Ribs 10-12

Linea alba as aponeurosis

Internal Oblique Action

Unilateral: Ipsilateral rotation, ipsilateral sidebend

Bilateral: Trunk Flexion

Internal Oblique/Transverse Abdominus Innervation

Ventral Rami of corresponding levels

Iliohypogastric & Ilioinguinal nerves

Transversus Abdominus Origin

Anterior iliac crest, Costal cartilagges of ribs 6-12, thoracolumbar fascia

Transversus Abdominus Insertion

Linea alba as aponeurosis

Transverse Abdominus Action

Tenses & Stabilizes the abdominal wall

Rectus Abdominus Origin

Xiphoid Process, 5-7 costal cartilage

Rectus Abdominus Insertion

Pubis

Rectus Abdominus Action

Trunk flexion, abdominal compression, forced expiration

Rectus Abdominus Innervation

Intercostal nerves (T7-T11), subcostal nerve (T12)

Rectus Abdominus Vascular Supply

Inferior epigastric and superior epidgastric arteries

Cremaster Origin

Internal abdominal oblique

Cremaster Insertion

Tunica vaginalis

Cremaster Action

Raises the testicle

Cremaster Innervation

Genital branch of the genitofemoral n.

Cremaster Vascular Supply

Cremasteric a.

Psoas Major Origin

Transverse process T12-L4

Psoas Major Insertion

Lesser trochanter of the femur

Psoas Major Action

Flexion of the hip

Psoas Major Innervation

Nerve to psoas (L1-3)

Psoas Major Vascular Supply

Internal Iliac a.

Quadratus Lumborum Origin

Posterior Iliac Crest

Quadratus Lumborum Insertion

Rib 12 and transverse proceesses of lumbar spine

Quadratus Lumborum Action

Lumbar stabilization, may laterally flex spine

Quadratus Lumborum Innervation

Direct branches from ventral rami L1-L5

Coccygeus Origin

Ischial spine

Coccygeus Insertion

Coccyx

Coccygeus Action

Supports pelvic viscera, flexes coccyx

Coccygeus innervation

Nerve to coccygeus (S3-4)

Coccygeus Vascular Supply

Internal pudendal, einferior gluteal artery

Levator Ani (puberectalis, pubococcygeus, & iliococcygeus) Origin

Pubis and Ilium

Levator Ani (puberectalis, pubococcygeus, & iliococcygeus) Insertion

Coccyx and rectum

Levator Ani (puberectalis, pubococcygeus, & iliococcygeus) Action

Supports pelvic viscera

Levator Ani (puberectalis, pubococcygeus, & iliococcygeus) Innervation

Nerve to levator ani

Transversus Perinei Superficialis Origin

Ishial Tuberosity

Transversus Perinei Superficialis Insertion

Perineal body

Transversus Perinei Superficialis Action

Stabilizes perineum, supports pelvic viscera

Transversus Perinei Superficialis Innervation

Perineal nerve

Bulbospongiosus Origin

Pubic arch

Bulbospongiosus Insertion

Perineal body

Bulbospongiosus Action

Acts as sphincter to urethra, functions in male erection

Bulbospongiosus Innervation

Pudendal Nerve

Ischiocavernosus Origin

Ischiopubic Ramus

Transversus Perinei Superficialis Vascular Supply

Perineal artery

Ischiocavernosus Insertion

Tunica albuginea

Ischiocavernosus Action

Increase pressures within erectile tissues

Ischiocavernosus Innervation

Pudendal Nerve