Muscles Lumbopelvic Flashcards
Rectus Abdominis OIIA
Origin- Pubic Symphysis and pubic crest
Insertion- Xiphoid Process and 5th -7th costal cartilages
Innervation- Anterior rami of T6-T12 spinal nerves; thoraco-abdominal
Action- Flexes/stabilizes trunk and compresses abdominal viscera
Transversus Abdominals OIIA
Origin- Iliac crest, thoracolumbar fascia, and surfaces of 7th-12th costal cartilages
Insertion- Linea alba, pubic crest, pecten pubis
Innervation- Anterior Rami of T6-12 spinal nerves/1st Lumbar nerve
Action- Compresses and supports abdominal viscera
Internal Oblique OIIA
Origin- Thoracolumbar fascia, iliac crest, inguinal ligament
Insertion- Linea alba, 10th-12th ribs
Innervation-Anterior Rami of T6-12 spinal nerves/1st Lumbar nerve
Action- Flexes/rotates trunk, compresses/supports abdominal viscera
External Oblique OIIA
Origin- 5th-12th Ribs
Insertion- Linea alba, iliac crest, pubic tubercle
Innervation- T7-T11 spinal nerves, subcostal nerves,
Action-Flexes/rotates trunk, compresses/supports abdominal viscera
Psoas Major OIIA
Origin- Transverse processes of all Lumbar vertebrae,
Insertion- Lesser Trochanter
Innervation- L1,L2
Action- Flexion and lateral rotation of hip joint/stabilization of the joint when standing
Obturator internus OIIA
Origin- Iliac and Ischium; obturator membrane
Insertion- Greater trochanter
Innervation- Nerve to Obturator internus L5,S1,S2
Action- Rotates hip laterally
Piriformis OIIA
Origin- Surface of S2-S4, greater sciatic notch
Insertion- greater Trochanter
Innervation- Anterior rami of S1-2
Action- Rotates hip laterally, abduction
Coccygeus OIIA
Origin- Ischial spine
Insertion- Inferior end of sacrum/coccyx
Innervation- Branches of S4-S5
Action- Flexes coccyx and supports pelvic viscera
Levator Ani OIIA
Bonus Question which 3 muscles make up the Levator Ani
Origin- Body of pubis, tendinous arch of obturator fascia, ischial spine
Insertion- Perineal body, coccyx, walls of prostate/vagina/rectum, anal canal
Innervation- Nerve to Levator Ani S4
Action- forms pelvic diaphragm, support pelvic viscera
3 Muscle= Puborectalis, pubococcygeus, Iliococcygeus
Iliacus OIIA
Origin- Iliac crest, iliac fossa, sacroiliac ligaments
Insertion- Tendon of psoas major, lesser trochanter
Innervation- femoral nerve L2
Action - Flexion and lateral rotation of hip joint, helps stabilize when standing
Iliocostalis OIIA
Origin- Broad tendon, iliac crest, sacrum, sacral/inferior lumbar spinous processes, supraspinous processes
Insertion- Fibers run superiorly, lower ribs and cervical transverse processes
Innervation- Posterior rami of spinal nerves
Action- Bilaterally extend vertebral column,
Unilaterally flexes vertebral column
Longissimus OIIA
Origin-Broad tendon, iliac crest, sacrum, sacral/inferior lumbar spinous processes, supraspinous processes
Insertion- runs superiorly to ribs between tubercles, transverse processes in thoracic and cervical regions to mastoid process
Innervation- posterior rami of spinal nerves
Action-Bilaterally extend vertebral column,
Unilaterally flexes vertebral column
Spinalis OIIA
Origin-Broad tendon, iliac crest, sacrum, sacral/inferior lumbar spinous processes, supraspinous processes
Insertion- Fibers run superiorly to spinous processes in the upper thoracic and to cranium
Innervation- Posterior rami of spinal nerves
Action-Bilaterally extend vertebral column,
Unilaterally flexes vertebral column
Semispinalis OIIA
Origin- Transverse processes of C4-T12 Vertebrae
Insertion- Fibers run superomedially to occipital bone and spinous processes in cervical/thoracic region spanning 4-6 segments
Innervation- Posterior rami of spinal nerves
Action- Extension of head/thoracic and cervical regions of the vertebrae; rotates them contralaterally
Multifidus OIIA
Origin- Posterior sacrum, superior iliac spine of ilium, transverse processes of T1-T3 & articular processes of C4-C7
Insertion- Run entire length of spinous processes located 2-4 segments superior to proximal attachment
Innervation- Posterior rami of spinal nerves
Action- stabilizes vertebrae during local movements in the vertebral column