Muscles Lumbopelvic

Question 1

Rectus Abdominis OIIA

Answer 1

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

Question 2

Transversus Abdominals OIIA

Answer 2

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

Question 3

Internal Oblique OIIA

Answer 3

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

Question 4

External Oblique OIIA

Answer 4

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

Question 5

Psoas Major OIIA

Answer 5

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

Question 6

Obturator internus OIIA

Answer 6

Origin- Iliac and Ischium; obturator membrane
Insertion- Greater trochanter
Innervation- Nerve to Obturator internus L5,S1,S2
Action- Rotates hip laterally

Question 6

Piriformis OIIA

Answer 6

Origin- Surface of S2-S4, greater sciatic notch
Insertion- greater Trochanter
Innervation- Anterior rami of S1-2
Action- Rotates hip laterally, abduction

Question 7

Coccygeus OIIA

Answer 7

Origin- Ischial spine
Insertion- Inferior end of sacrum/coccyx
Innervation- Branches of S4-S5
Action- Flexes coccyx and supports pelvic viscera

Question 8

Levator Ani OIIA
Bonus Question which 3 muscles make up the Levator Ani

Answer 8

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

Question 9

Iliacus OIIA

Answer 9

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

Question 10

Iliocostalis OIIA

Answer 10

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

Question 11

Longissimus OIIA

Answer 11

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

Question 12

Spinalis OIIA

Answer 12

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

Question 13

Semispinalis OIIA

Answer 13

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

Question 14

Multifidus OIIA

Answer 14

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

Question 15

Rotatores OIIA

Answer 15

Origin- Transverse processes of vertebrae
Insertion- Attach to junction of lamina and transverse process or spinous process of vertebra immediately or 2 segments above
Innervation- Posterior rami of spinal nerves
Action- stabilizes vertebrae and assist with local extension and rotary movement

Question 16

Latissimus Dorsi OIIA

Answer 16

Origin- Spinous processes of T7-T12, Iliac crest, ribs 9-12, inferior angle of the scapula
Insertion- Intertubercular groove of humerus
Innervation- Thoracodorsal nerve
Action- Arm internal rotation, extension and adduction

Question 17

Quadratus Lumborum OIIA

Answer 17

Origin- Iliac crest
Insertion- Transverse processes of L1-L4 and 12th rib
Innervation- T12,L1-2
Action- Stabilizer/flexion