Latissimus Dorsi

Description

Latissimus dorsi anatomy highlighting the muscle’s origin and insertion. This figure also shows the blood supply of latissimus dorsi muscle provided by the thoracodorsal artery

Name

• Latissimus Dorsi
• Lats

Origin

• Spinous process of vertebrae T7-L5
• Sacrum
• Lower 3-4 ribs
• Iliac crest (posterior 1/3)

Insertion

• Humerus (intertubercular groove)

Actions

• Adduction, extension, and medial rotation of the Humerus
• Depression of Scapula

Vascular Supply

• Thoracodorsal Artery

Nerve

• Thoracodorsal Nerve (C7,8)

---

Clinical Significance

• Quadrilateral Space Syndrome

---

See Also

• Physical Exam Shoulder
• Shoulder Anatomy (Main)
• Shoulder Pain (Main)
• Back Anatomy (Main)
• Physical Exam Back
• Back Pain (Main)

---