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Muscle Name: Latissimus Dorsi (Back)

Medical Name:

• Latissimus Dorsi

Other Names:

• Lats
• Broadest Muscle of the Back

Head:

• None (Single muscle with broad origin)

Movement:

• Extension of the shoulder
  • Bringing the arm backward
• Adduction of the humerus
  • Bringing the arm towards the body
• Medial rotation of the humerus
  • Rotating the arm inward

Attachment:

• Origin:
  • Spinous processes of T7-L5 vertebrae
  • Thoracolumbar fascia
  • Iliac crest
  • Inferior 3 or 4 ribs
  • Inferior angle of the scapula
• Insertion:
  • Floor of the intertubercular sulcus (bicipital groove) of the humerus

Related Muscles:

• Teres Major
• Rhomboids
• Trapezius
• Erector Spinae
• Pectoralis Major
• Subscapularis

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