Anatom3DLongissimus thoracis
Musculus longissimus thoracis · Nejdelší sval hrudníku
Muscles
Looks like
The longest and biggest part of the erector spinae, running from the sacrum and lumbar spine up to the chest vertebrae and lower ribs.
What it does
Straightens the back, holds you upright and controls bending forward.
Keeping it well
Common site of back muscle strain; exercises like deadlifts and back extensions build it. Serious back red flags need a doctor.