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Questions and Answers
What is the origin of the deltoid muscle?
What is the origin of the deltoid muscle?
- Medial border of the scapula
- Anterior border of lateral 1/3 of clavicle (correct)
- Inferior border of the sternum
- Lateral border of scapula
What is the insertion point for the deltoid muscle?
What is the insertion point for the deltoid muscle?
- Coracoid process
- Greater tubercle of the humerus
- Deltoid tuberosity (correct)
- Lesser tubercle of the humerus
Which nerve supplies the deltoid muscle?
Which nerve supplies the deltoid muscle?
- Median nerve
- Musculocutaneous nerve
- Axillary nerve (correct)
- Radial nerve
What action do the anterior fibers of the deltoid muscle perform?
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?
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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