Multiple Choice
Which muscle is primarily responsible for rotating the scapula upward during arm elevation?
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1. Introduction to Anatomy & Physiology
Introduction to Anatomical Terms for Body Regions
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Which of the following nerves is NOT a main branch of the brachial plexus?
A
Ulnar nerve
B
Radial nerve
C
Femoral nerve
D
Musculocutaneous nerve
Verified step by step guidance1
Step 1: Understand the brachial plexus. The brachial plexus is a network of nerves that originates from the spinal cord in the neck (C5-T1) and provides motor and sensory innervation to the upper limb.
Step 2: Identify the main branches of the brachial plexus. The major branches include the musculocutaneous nerve, axillary nerve, radial nerve, median nerve, and ulnar nerve.
Step 3: Compare the listed nerves to the main branches of the brachial plexus. The ulnar nerve, radial nerve, and musculocutaneous nerve are all part of the brachial plexus.
Step 4: Recognize that the femoral nerve is not part of the brachial plexus. The femoral nerve originates from the lumbar plexus (L2-L4) and primarily innervates the anterior thigh, not the upper limb.
Step 5: Conclude that the femoral nerve is the correct answer as it is not a main branch of the brachial plexus.
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