The Latissimus Dorsi Muscle


March 9, 2015     muscle | shoulders | Anatomy | Upper Limb

Latissimus dorsi – the swimmer’s muscle

The latissimus dorsi muscle is a large sweeping muscle that connects the lower half of the body (pelvis) to the arm itself. Because of its many actions associated with movements of swimming, it’s known as the swimmer’s muscle.

Latissimus Dorsi Muscle

What does the latissimus dorsi muscle mean?

The name of the latissimus dorsi muscle describes its size and location. Latissimus comes from the Latin word “latus” meaning wide, and dorsi comes from the Latin word “dorsum” meaning back.

Where does the latissimus dorsi muscle attach?

Origin

  • Thoracolumbar aponeurosis (fancy way of saying a common tendinous sheath). It connects the attachments to the areas below with the exception of the inferior angle of the scapula.
  • T7-L5 – on the spinous processes (the parts that stick out that we can feel on our back).
  • Sacrum
  • Crest of the ilium (top back portion of the pelvis)
  • Inferior (bottom) angle of the scapula

Insertion

  • Bicipital groove – A divot in the bone that the biceps tendon lays in.

Latissimus Dorsi Muscle Attachments

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What actions does the latissimus muscle do?

  • Medial (internal) rotation of the shoulder joint
  • Extension of the shoulder joint
  • Adduction of the shoulder joint
  • Depression of the scapula

Assists these actions

  • Lateral flexion of the trunk
  • Extension of the spine

Postures where this muscle contracts

uttitha hasta padangusthasana

The “lats” contract to bring the upper arms toward the body in adduction.

bakasana

The lats help stabilize the shoulder in bakasana (below).

Postures where this muscle lengthens

utkatasana

The lats are lengthened with the arms abducted and flexed (below).

Trigger points

 

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