Questions and Answers
What is the origin of the deltoid muscle?
What is the insertion point for the deltoid muscle?
Which nerve supplies the deltoid muscle?
What action do the anterior fibers of the deltoid muscle perform?
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What is the range of arm abduction by the middle fibers of the deltoid muscle?
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Study Notes
Deltoid Muscle Overview
- The deltoid muscle is a key muscle of the shoulder, crucial for arm movements.
- Its primary actions include flexion, extension, abduction, medial, and lateral rotation of the arm.
Origin
- Originates from the anterior border of the lateral one-third of the clavicle.
- Also arises from the lateral border of the acromion process and the inferior lip of the spine's crest.
Insertion
- Inserts at the deltoid tuberosity of the humerus, a prominent area for muscle attachment.
Nerve Supply
- Innervated by the axillary nerve, which is responsible for its motor function.
Action
- Anterior fibers facilitate flexion and medial rotation of the arm.
- Middle fibers are responsible for abducting the arm within the range of 15° to 90°.
- Posterior fibers enable extension and lateral rotation of the arm, assisting in various movements.
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Description
This quiz focuses on the anatomy and functions of the deltoid muscle, a key muscle in shoulder movement. It explores its origin, insertion, nerve supply, and the specific actions performed by its fibers. Test your knowledge about this essential muscle for arm mobility.
