The upper limbs are innervated by nerves running to and from the _____.

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BlackTom AI · Accepted Answer

To begin, let's restate what the question is asking in plain terms and list the available choices so we can compare them side by side.
Question: The upper limbs are innervated by nerves running to and from the _____.
Answer options: Lumbar plexus; Cervical ramus; Brachial enlargement; Lumbar enlargement; Brachial plexus
Now, evaluate each option one by one:
Option 1: Lumbar plexus. This option is incorrect because the lumbar plexus is a network of nerves that supplies the lower limb and pelvic region, not the upper limb. Using it here would misplace the innervation territory inferiorly.
Option 2: Cervical ramus. While the cervical region contributes to the nerves that partly enter the upper limb, the term 'cervical ramus' refers more generally to dorsal and ventral rami of the cervical spinal nerves, not to the specific plexus that organizes the innervation of the upper limb. It’s incomplete and imprecise for describing the nerve network to the arm.
Option 3: Brachial enlargement. The brachial enlargement is a region of the spinal cord (or a descriptive term that might be confused with structures near the arm) but it is not the named nerve network that actually innervates the upper limb. It’s not the standard anatomical term used to describe the innervation of the arm.
Option 4: Lumbar enlargement. This option is clearly related to the nerves that service the lower limbs; as the name suggests, it’s located in the lumbar region and has no role in innervation of the upper limbs. It’s mismatched in both location and function.
Option 5: Brachial plexus. This is the correct anatomical structure responsible for providing the nerves that innervate the upper limb. It is formed by contributions from the lower cervical and upper thoracic spinal nerves and gives rise to the major nerves that control arm and hand movements and sensation.
In summary, the incorrect choices misplace or mislabel the neural structures associated with upper limb innervation, while the correct choice accurately designates the network known to supply the arm and hand.

BIOL 251 Module 7 Problem Set

The upper limbs are innervated by nerves running to and from the _____.

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