The lateral cord gives rise to which terminal branches of the brachial plexus?

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BlackTom AI · Accepted Answer

Question restatement: The lateral cord gives rise to which terminal branches of the brachial plexus?

Option 1: Musculocutaneous and axillary nn.
- This is incorrect. The musculocutaneous nerve is indeed a direct branch of the lateral cord, but the axillary nerve originates from the posterior cord, not the lateral cord. Mistaking posterior-origin nerves for lateral-origin is a common pitfall here.

Option 2: Ulnar and median nn.
- This is incorrect. The ulnar nerve comes from the medial cord, not the lateral cord. The median nerve is formed from contributions of both the lateral and medial cords, so stating it as a sole product of the lateral cord is inaccurate.

Option 3: Median and radial nn.
- This is incorrect. The radial nerve arises from the posterior cord, while the median nerve is formed by joint contributions of the lateral and medial roots. Thus, neither radial nor the median nerve alone can be described as a direct lateral-cord branch.

Option 4: Musculocutaneous and median nn.
- This option aligns with the accepted description that the lateral cord directly gives off the musculocutaneous nerve. Regarding the median nerve, the lateral cord contributes a root to its formation (the lateral root of the median nerve), and together with the medial root forms the full median nerve. Therefore, mentioning the musculocutaneous nerve as a direct lateral-cord branch and the median nerve as a structure that receives a lateral contribution is a reasonable representation of lateral-cord output.

Option 5: Axillary and radial nn.
- This is incorrect. The axillary nerve is a branch of the posterior cord, and the radial nerve also arises from the posterior cord. Together they are not products of the lateral cord.

Summary: Among the options, the statement that includes musculocutaneous as a direct branch of the lateral cord and acknowledges the lateral contribution to the median nerve best reflects the anatomical reality of how the lateral cord structures relate to these nerves. The other choices either assign branches to the wrong cord or imply direct lateral-cord origins for nerves that are actually from other cords or formed via contributions, leading to inaccuracies.

ANATOMY 2300 AU2025 (34636) Unit 3 Exam- Requires Respondus LockDown Browser

The lateral cord gives rise to which terminal branches of the brachial plexus?

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