Back · Skeletal muscle
Latissimus Dorsi (Back Muscle)
The latissimus dorsi is the large, wing-shaped muscle of the lower and mid back. It pulls the arm down and back, powering movements like pulling and rowing.
What it is
The latissimus dorsi is a broad, flat muscle covering much of the lower and mid back, running from the spine and pelvis up to the upper arm.
Where it is
The lower and middle back, sweeping up to the armpit on each side.
What it does
Pulls the arm downwards and backwards and rotates it inwards; important in pulling and climbing.
Everyday use
Pulling a door open, rowing, swimming and climbing all use the lats.
When things go wrong
Common problems affecting the latissimus dorsi (back muscle)
- Muscle strain
- Overuse in rowing or swimming athletes
Education and reference only. This explains the anatomy in plain terms and is not a diagnosis. Sudden severe symptoms — such as crushing chest pain or collapse — are an emergency; call 999.
Looking after it
Keeping it healthy
Balanced back and shoulder strengthening and good technique in pulling exercises protect the lats.
Did you know?
An interesting fact
The latissimus dorsi is the widest muscle in the body — its name literally means "widest muscle of the back".
Answers
Latissimus Dorsi (Back Muscle): frequently asked questions
What does the latissimus dorsi do?
The "lats" pull the arm down and back, powering pulling, rowing, swimming and climbing movements.
Related muscles
Explore the back
Sources
Where this is drawn from
- NHS — Muscles and movement
- Gray's Anatomy for Students
- TeachMeAnatomy — muscular system
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