Dissection of thoracic and lumbosacral regions of back from a posterior approach

Components of erector spinae muscle separated, general view

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Image #213-5

Dissection of thoracic and lumbosacral regions of back from a posterior approach Components of erector spinae muscle separated, general view The heavy aponeurosis of origin of the left erector spinae has been partially removed near the midline. This portion of the aponeurosis, form which the longissimus thoracic part arises, also serves to give attachment to portions of the underlying multifidus muscle (8). The iliocostalis (2, 6), longissimus (4) and spinalis (5) muscles have been separated from each other. 1 . Rib II 2 . Iliocostalis muscle 3 . Rib VI 4 . Longissimus thoracis muscle 5 . Spinalis thoracis muscle 6 . Iliocostalis lumborum muscle 7 . Internal oblique muscle 8 . Multifidus muscle 9 . Spinous process vertebra Th. III 10 . Trapezius muscle 11 . Latissimus dorsi muscle 12 . Spinous process vertebra Th. XII 13 . Thoracolumbar fascia (posterior layer) 14 . Iliac crest 15 . Gluteus maximus muscle