The brachialis muscle is innervated exclusively by the musculocutaneous nerve.
Understand the Problem
The question presents a statement about the innervation of the brachialis muscle and asks whether it's true or false. We need to determine if the brachialis muscle is exclusively innervated by the musculocutaneous nerve.
Answer
False. While primarily innervated by the musculocutaneous nerve, the brachialis also receives innervation from the radial and sometimes median nerves.
The statement is false. The brachialis muscle is primarily innervated by the musculocutaneous nerve, but it also receives innervation from the radial nerve in its lateral portion and, in some cases, from the median nerve.
Answer for screen readers
The statement is false. The brachialis muscle is primarily innervated by the musculocutaneous nerve, but it also receives innervation from the radial nerve in its lateral portion and, in some cases, from the median nerve.
More Information
The dual innervation of the brachialis muscle by both the musculocutaneous and radial nerves is a clinically significant anatomical variation. This redundancy in nerve supply can help preserve some muscle function even if one of the nerves is damaged.
Tips
A common mistake is to assume single innervation based on primary nerve supply; always consider the possibility of multiple nerve sources for muscles.
Sources
- Anatomy, Shoulder and Upper Limb, Musculocutaneous Nerve - NCBI - ncbi.nlm.nih.gov
- Brachialis - Physiopedia - physio-pedia.com
- Brachialis muscle: Location, origin and insertion, action - Kenhub - kenhub.com
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