the spinal nerve associated with innervation of the diaphragm is the...

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Question restatement: Which spinal nerve is associated with innervation of the diaphragm?

Option 1: sciatic nerve. This nerve is primarily a lower limb nerve arising from the lumbosacral plexus and does not innervate the diaphragm. Its functions relate to the posterior thigh and leg, not breathing mechanics.

Option 2: phrenic nerve. The phrenic nerve is the key somatic motor and sensory nerve for the diaphragm, typically arising from cervical spinal roots C3–C5, and it provides the sole motor innervation to the diaphragm as well as sensory fibers to its central portion. This directly aligns with diaphragmatic innervation.

Option 3: ulnar nerve. The ulnar nerve travels from the medial cord of the brachial plexus and supplies motor and sensory innervation to parts of the forearm and hand. It has no role in diaphragmatic or respiratory muscle innervation.

Option 4: obturator nerve. The obturator nerve also derives from the lumbar plexus and primarily innervates the medial thigh muscles and skin. It does not innervate the diaphragm or participate in respiration.

Option 5: mediastinum nerve. There is no standard nerve named the 'mediastinum nerve' in anatomy; this option does not correspond to a recognized spinal nerve or neural pathway associated with diaphragmatic innervation.

Putting the pieces together, the diaphragm’s main neural control is provided by the phrenic nerve, while the other listed nerves have unrelated regional innervation and functions. The incorrect options either pertain to other regions (limbs or chest wall) or include an nonstandard/incorrect term, making them unsuitable as the diaphragmatic nerve.

BIOLOGY 211-B09C Practice Exam 2

the spinal nerve associated with innervation of the diaphragm is the...

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The ____________________ nerve is responsible for innervation of the diaphragm.

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