Where do the middle fibers of the deltoid originate?

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Multiple Choice

Where do the middle fibers of the deltoid originate?

Explanation:
The middle fibers originate from the acromion of the scapula. This part of the scapula sits on the lateral shoulder, so attaching there lets the deltoid pull the humerus outward to lift the arm away from the body (abduction). The deltoid has three parts with distinct origins: anterior fibers come from the clavicle to help with flexion and medial rotation, while posterior fibers originate from the spine of the scapula to aid in extension and lateral rotation. The coracoid process isn’t a deltoid origin; it serves other muscles (like coracobrachialis and biceps short head) instead.

The middle fibers originate from the acromion of the scapula. This part of the scapula sits on the lateral shoulder, so attaching there lets the deltoid pull the humerus outward to lift the arm away from the body (abduction). The deltoid has three parts with distinct origins: anterior fibers come from the clavicle to help with flexion and medial rotation, while posterior fibers originate from the spine of the scapula to aid in extension and lateral rotation. The coracoid process isn’t a deltoid origin; it serves other muscles (like coracobrachialis and biceps short head) instead.

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