Questions and Answers
What is the origin of the Latissimus Dorsi?
Where does the Latissimus Dorsi insert?
Humerus (Intertubercular sulcus)
What nerve innervates the Latissimus Dorsi?
Thoracodorsal nerve (C6, C7, C8)
Which of the following actions does the Latissimus Dorsi perform? (Select all that apply)
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What supplies blood to the Latissimus Dorsi? (Select all that apply)
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Study Notes
Latissimus Dorsi Overview
- Major muscle of the back, crucial for a range of movements involving the shoulder and upper body.
Origin
- Originates from the spinous processes of T7 to L5 vertebrae.
- Attached to the thoracolumbar fascia, providing stability and strength.
- Connects to the iliac crest, contributing to its lower part of attachment.
- Includes last three ribs as additional points of origin.
Insertion
- Inserts into the intertubercular sulcus of the humerus, positioning it to affect arm movement effectively.
Innervation
- Innervated by the thoracodorsal nerve, originating from spinal nerves C6, C7, and C8, ensuring muscle control and coordination.
Actions
- Extends the humerus, playing a key role in raising the arm backward.
- Adducts the humerus, essential for movements such as pulling and swinging.
- Medially rotates the humerus, influencing movements like internal rotation during shoulder actions.
Blood Supply
- Receives blood from the thoracodorsal artery, vital for muscle nourishment and function.
- Additional supply from the dorsal perforating branches of the ninth, tenth, and eleventh posterior intercostal arteries, enhancing vascularization.
- Also supported by the first three lumbar arteries, ensuring adequate blood flow for performance during physical activities.
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Description
This quiz features flashcards detailing the latissimus dorsi muscle's origin, insertion, innervation, action, and blood supply. Perfect for anatomy students wanting to master muscle mechanics and structures. Test your knowledge and enhance your learning!
