Which portion of the pectoralis major is mainly responsible for shoulder flexion?

Unlock all questions

This demo includes only 20 questions. Upgrade to access hundreds of questions, flashcards, exam simulations, and disable ads.

Full question bankExam simulationsFlashcards

From $24.99Unlock all

Study for the Muscle Actions and Functions – Anatomy and Movement Test. Equip yourself with multiple choice questions, each with detailed explanations and hints. Prepare confidently for your exam!

Multiple Choice

Which portion of the pectoralis major is mainly responsible for shoulder flexion?

The clavicular portion is the primary driver of shoulder flexion because its fibers originate on the clavicle and pull the humerus upward and forward when it contracts. This orientation helps lift the arm in front of the body from the neutral position, making it the main contributor to flexion in the initial range (up to about horizontal). The sternocostal portion, by contrast, has a line of pull that favors adduction and extension of a flexed arm, so it contributes more to bringing the arm toward the body or back down rather than initiating forward elevation. Therefore, while both parts can assist in various movements, the clavicular portion best accounts for shoulder flexion.

Which portion of the pectoralis major is mainly responsible for shoulder flexion?

Study for the Muscle Actions and Functions – Anatomy and Movement Test. Equip yourself with multiple choice questions, each with detailed explanations and hints. Prepare confidently for your exam!

Which portion of the pectoralis major is mainly responsible for shoulder flexion?

Get the latest from Examzify