The brachial plexus is associated with spinal nerves C4-8 and T1. It leads to major nerves of the shoulder and arm. The axillary nerve arises from the brachial plexus and innervates the deltoid and the teres minor muscles. It also receives stimulation from the skin of the shoulder and lateral upper limb. The radial nerve innervates the triceps brachii muscle and the extensors of the forearm and hand. The musculocutaneous nerve innervates the anterior muscles of the arm (biceps brachii, brachialis, and coracobrachialis) and the skin on the lateral side of the forearm. The median nerve runs the length of the arm and forearm and innervates the anterior muscles of the forearm and the muscles associated with the thumb. The ulnar nerve passes along the posterior side of the medial epicondyle of the humerus and gives that tingling sensation of the "funny bone" when hit. It innervates the muscles of the medial side of the anterior hand. Label these nerves and related structures and color them in. Select a different color for each nerve.
First rib Axillary artery
Answer Key: a. C4, b. C5, c. C6, d. C7, e. C8, f. T1, g. Axillary nerve, h. Musculocutaneous nerve, i. Radial nerve, j. Median nerve, k. Ulnar nerve, I. Vertebra C4
Was this article helpful?
This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.