Twelfth thoracic vertebra - Vertebra thoracica XII
First lumbar vertebra - Vertebra lumbalis I
Fourth lumbar vertebra - Vertebra lumbalis IV
Fifth lumbar vertebra - Vertebra lumbalis V
Five sacral vertebrae (merged)
Pear-shaped muscle - Piriformis muscle
Sciatic nerve - Sciatic nerve Sections of the spine: C - neck area (cervical) T - chest area (thoracic) L - lumbar region (lumbar) S - sacrum area (sacral)
You can find an overview of all Dr-Gumpert images at: medical illustrations