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

Question

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

BlackTom AI · Accepted Answer

Topic context: identifying the nerve innervating the prime mover for inspiration.
Option 1: Thoracic nerve. This is too generic a label and does not correspond to a single nerve responsible for diaphragm innervation; thoracic nerves contribute to intercostal innervation but are not the sole prime mover driver for inspiration.
Option 2: Phrenic nerve. The phrenic nerve arises from cervical spinal nerves C3–C5 and provides motor innervation to the diaphragm, which is the principal muscle driving inspiration at rest and during many breathing efforts. It is the classic nerve associated with diaphragmatic movement and respiratory inspiration.
Option 3: Medial nerve. There is no well-known nerve called the “medial nerve” in the context of respiration or diaphragm innervation; this label does not map to a cranial or spinal nerve supplying the inspiratory muscles.
Option 4: Spinal nerve. While spinal nerves contribute to the innervation of many muscles via ventral rami, naming a generic “spinal nerve” lacks the specificity needed to identify the diaphragm’s motor supply. The diaphragm is specifically innervated by the phrenic nerve, not a generic spinal nerve.
Option 5: Accessory nerve. The accessory (cranial XI) nerve primarily supplies the sternocleidomastoid and trapezius muscles and is not the primary motor supply to the diaphragm or the principal inspiratory muscles.
Option 6: Intercostal nerve. Intercostal nerves supply the intercostal muscles, which assist respiration, but they are not the primary driver of inspiration—the diaphragm plays that role, with the phrenic nerve providing its motor innervation. Intercostal nerves contribute to the mechanics of breathing, especially during laborious breathing, but they are not the prime mover innervation.
Summary: evaluating the options, the one that aligns with the motor innervation of the diaphragm, the primary inspiratory muscle, is the phrenic nerve. The other choices either refer to incorrect, non-specific, or non-diaphragm-related nerves and do not capture the primary motor pathway for inspiration.

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

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