Latissimus Dorsi Muscle

Latissimus Dorsi Muscle

Question 1. Give the origin, insertion, nerve supply, and actions of the latissimus dorsi muscle.
Answer.

Latissimus Dorsi Muscle Origin

Latissimus dorsi muscle arises from:

“Understanding the latissimus dorsi muscle through FAQs: Composition, functions, and uses explained”

• Spinous processes and supraspinous ligaments from T7 to T12
• Posterior layer of thoracolumbar fascia (attached to spinous processes of lumbar and sacral spines)
• The last four ribs
• Inferior angle of the scapula
• The posterior one-third of the iliac crest

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Latissimus Dorsi Muscle Insertion

It enters the floor of the bicipital groove of the humerus after spiralling around the teres major muscle.

Latissimus Dorsi Muscle Nerve Supply

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Thoracodorsal nerve (C6, C7 and C8)

Latissimus Dorsi Muscle Actions

• Extends, adducts, and medially rotates the arm.
• Cortical attachment helps in deep inspiration and forced expiration.