What is the proximal attachment of the pectoralis minor muscle?

The proximal attachment of the pectoralis minor muscle is indeed the coracoid process of the scapula. The pectoralis minor is a small, thin muscle located underneath the pectoralis major and originates specifically from the anterior surfaces and superior margins of the third through fifth ribs, near their costal cartilages.

This muscular attachment is significant as it contributes to the muscle's function in movements such as scapular protraction and depression. Understanding this attachment is crucial for grasping how the pectoralis minor can affect shoulder mechanics and movements associated with the upper limb. The other options describe different anatomical landmarks that do not serve as the point of attachment for this specific muscle and may lead to confusion regarding its anatomical positioning and function.