Question at position 1 The nerve that innervates the prime mover for inspiration is the _____.Medial nerveSpinal nervePhrenic nerveThoracic nerveAccessory nerveIntercostal nerve

Question

Question at position 1 The nerve that innervates the prime mover for inspiration is the _____.Medial nerveSpinal nervePhrenic nerveThoracic nerveAccessory nerveIntercostal nerve

BlackTom AI · Accepted Answer

To unpack this question, let's evaluate what each listed nerve does in the context of respiration.
Option 1: Medial nerve. This name does not correspond to a standard major nerve associated with breathing. In anatomy, there is no well-known 'Medial nerve' that innervates the diaphragm or the primary inspiratory muscles, so this choice is incorrect due to misnaming and lack of relevance.
Option 2: Spinal nerve. While spinal nerves are the origins for many peripheral nerves, the question asks for the specific nerve that innervates the prime mover for inspiration. A generic 'spinal nerve' is too broad and does not identify the dedicated motor supply to the diaphragm, so this is not the right answer.
Option 3: Phrenic nerve. This is the key player here. The phrenic nerve arises from C3–C5 and provides motor innervation to the diaphragm, the primary muscle driving inspiration. It is the classic nerve associated with the main inspiratory muscle, making this the correct choice.
Option 4: Thoracic nerve. There isn't a single 'Thoracic nerve' that serves as the sole innervator of the diaphragm or the main inspiratory muscle. Thoracic nerves exist in multiple segments, but none are named to reflect the primary diaphragm supply, so this option is inaccurate.
Option 5: Accessory nerve. The accessory (cranial nerve XI) mainly innervates the sternocleidomastoid and trapezius muscles, not the diaphragm or the primary inspiratory muscles. Therefore, it does not correctly describe the nerve that innervates the prime mover for inspiration.
Option 6: Intercostal nerve. Intercostal nerves do supply the intercostal muscles and contribute to respiration, especially during heavy breathing, but they are not the prime mover for inspiration. The diaphragm remains the principal muscle, so this option is incorrect as the identifying nerve for the prime mover.
Thus, after considering each option's role in respiration, the phrenic nerve best matches the description of innervating the prime mover for inspiration.

Question at position 1 The nerve that innervates the prime mover for inspiration is the _____.Medial nerveSpinal nervePhrenic nerveThoracic nerveAccessory nerveIntercostal nerve

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