QuestionAugust 19, 2025

What is the innervation of the pectoralis major? C3-6 C4-6 C5-T1 C7-T1

What is the innervation of the pectoralis major? C3-6 C4-6 C5-T1 C7-T1
What is the innervation of the pectoralis major?
C3-6
C4-6
C5-T1
C7-T1

Solution
4.3(275 votes)

Answer

C5-T1 Explanation 1. Identify the nerve supply The pectoralis major muscle is primarily innervated by the medial and lateral pectoral nerves. 2. Determine the spinal nerve roots The medial and lateral pectoral nerves arise from the brachial plexus, specifically from the spinal nerve roots C5-T1.

Explanation

1. Identify the nerve supply<br /> The pectoralis major muscle is primarily innervated by the medial and lateral pectoral nerves.<br /><br />2. Determine the spinal nerve roots<br /> The medial and lateral pectoral nerves arise from the brachial plexus, specifically from the spinal nerve roots $C5-T1$.
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