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Lumbar Muscles

Enter the muscles associated with Lumbar action, origin and insertion
Quiz by JJones2002
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Last updated: January 11, 2024
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First submittedJanuary 11, 2024
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Hint
Answer
Contraction: Compress abdomen, flex and rotate trunk

Origin: Inguinal ligament, iliac crest, Thoracolumbar fascia

Insertion: Inferior margins of 10th to 12th rib, linea alba, pecten pubis
Internal Obliques
Contraction: Compress abdomen, flex, laterally flex, rotate trunk

Origin: External surfaces and inferior borders of 5th to 12th rib

Insertion: ASIS, anterior half of iliac crest, pubic crest, pubic tubercule, linea alba
External Obliques
Contraction: Flex lumbar spine, compress abdomen

Origin: Pubic symphysis and pubic crest

Insertion: Xiphoid process of sternum and the costal cartilages of ribs 5th to 7th
Rectus Abdominus
Contraction: Compress abdomen providing thoracic and pelvic stability

Origin: Costal cartilages of 7th to 12th rib, Inguinal ligament, iliac crest, thoracolumbar fascia

Insertion: Linea alba and pubic crest, pecten pubis
Transversus abdominus
Contraction: Stabilises vertebrae column, extends neck

Origin: PSIS, dorsal surface of sacrum, mammillary processes of lumbar vertebrae, transverse processes of thoracic vertebrae, articular processes of C4-C7 vertebrae.

Insertion: Spinous processes of lumbar, thoracic and cervical vertebrae
Multifidus
Hint
Answer
Contraction: Extends and laterally flexes trunk, stabilises twelfth rib during inspiration

Origin: Posterior half of Iliac crest and iliolumbar ligament

Insertion: Inferior border of 12th rib, transverse processes of 1st to 4th lumbar vertebrae
Quadratus Lumborum
Contraction: Extends and laterally flexes trunk

Origin: Spinous processes of T11-L3 vertebrae

Insertion: Spinous processes of T2-T8 vertebrae.
Spinalis
Contraction: Extends and laterally flexes trunk

Origin: Spinous processes of L1-L5 vertebrae, dorsal surface of sacrum, iliac crest

Insertion: Transverse processes of lumbar and thoracic vertebrae, and 2nd to 12th ribs
Longissimus
Contraction: Extends and laterally flexes trunk

Origin: Angles of 7th to 12th ribs

Insertion: Angles of first to sixth ribs
Iliocostalis
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