Where does the longissimus thoracis insert?

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Multiple Choice

Where does the longissimus thoracis insert?

Explanation:
The longissimus thoracis inserts on the transverse processes of the thoracic vertebrae and on the ribs (typically ribs 3–12). This placement along the sides of the spine lets it extend the vertebral column and assist with lateral flexion. It’s separate from muscles that attach to spinous processes (like spinalis), the 12th rib border (like quadratus lumborum), or the mastoid process (which is where the longissimus capitis inserts). So the combination of transverse-process and rib insertions best matches the muscle’s actual attachments.

The longissimus thoracis inserts on the transverse processes of the thoracic vertebrae and on the ribs (typically ribs 3–12). This placement along the sides of the spine lets it extend the vertebral column and assist with lateral flexion. It’s separate from muscles that attach to spinous processes (like spinalis), the 12th rib border (like quadratus lumborum), or the mastoid process (which is where the longissimus capitis inserts). So the combination of transverse-process and rib insertions best matches the muscle’s actual attachments.

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