What is the insertion, nerve supply, and action of the deltoid muscle?
Understand the Problem
The question involves anatomical details regarding the deltoid muscle, specifically its insertion point, nerve supply, and actions. It appears to be requesting information on these aspects.
Answer
Insertion: Deltoid tuberosity of humerus. Nerve: Axillary nerve (C5, C6). Action: Abducts, flexes, extends, medially and laterally rotates arm.
The deltoid muscle inserts on the deltoid tuberosity of the humerus, is innervated by the axillary nerve (C5, C6), and its actions include abduction, flexion, extension, medial and lateral rotation of the arm at the shoulder joint.
Answer for screen readers
The deltoid muscle inserts on the deltoid tuberosity of the humerus, is innervated by the axillary nerve (C5, C6), and its actions include abduction, flexion, extension, medial and lateral rotation of the arm at the shoulder joint.
More Information
The deltoid muscle is crucial for shoulder joint movements and stability. It comprises three parts: anterior, middle, and posterior fibers, each contributing to different movements.
Tips
A common mistake is confusing the actions of different fibers of the deltoid. Remember that anterior fibers assist in flexion and medial rotation, while posterior fibers support extension and lateral rotation.
Sources
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