Shoulder abduction is primarily mediated by which nerve roots and muscle?

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 $25.99Unlock all

Study for the Parkinson’s Disease Exam. Engage with detailed flashcards and multiple-choice questions, each offering hints and explanations. Prepare effectively for your exam!

Multiple Choice

Shoulder abduction is primarily mediated by which nerve roots and muscle?

Explanation:
Shoulder abduction is driven most by the deltoid muscle, especially its middle fibers, once you move beyond the initial lift. The deltoid is innervated by the axillary nerve, which carries nerve roots from C5 and C6. The first ~15 degrees of abduction are done by the supraspinatus (also C5–C6), but the deltoid provides the bulk of the movement as you continue to raise the arm. So the combination of C5–C6 and the deltoid best explains the motor basis of shoulder abduction. The other options involve muscles and nerves that act on the elbow, wrist, or hand, not the primary shoulder abductor.

Shoulder abduction is driven most by the deltoid muscle, especially its middle fibers, once you move beyond the initial lift. The deltoid is innervated by the axillary nerve, which carries nerve roots from C5 and C6. The first ~15 degrees of abduction are done by the supraspinatus (also C5–C6), but the deltoid provides the bulk of the movement as you continue to raise the arm. So the combination of C5–C6 and the deltoid best explains the motor basis of shoulder abduction. The other options involve muscles and nerves that act on the elbow, wrist, or hand, not the primary shoulder abductor.

More Multiple Choice Questions
Subscribe

Get the latest from Passetra

You can unsubscribe at any time. Read our privacy policy