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

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

BlackTom AI · Accepted Answer

The question asks which nerve innervates the prime mover for inspiration.

Option 1: Phrenic nerve — The diaphragm is the primary muscle responsible for inspiration, and it is innervated by the phrenic nerve (originating mainly from C3–C5). This makes the phrenic nerve the correct anatomical link to the prime mover of inspiration.

Option 2: Intercostal nerve — Intercostal nerves provide sensory and motor innervation to the intercostal muscles and overlying skin, and they contribute to breathing but are not the primary motor supply to the diaphragm, which is the main driver of inspiration.

Option 3: Accessory nerve — The accessory nerve (cranial nerve XI) supplies the sternocleidomastoid and trapezius muscles, not the diaphragm. It has no role as the motor innervation for the primary inspiratory muscle.

Option 4: Medial nerve — If this refers to the median nerve, it innervates forearm and hand muscles and cutaneous regions; it has no involvement in diaphragm or inspiratory muscle control. In any case, there is no standard “medial nerve” as the primary inspiratory nerve.

Option 5: Spinal nerve — This is a broad category referring to nerves exiting the spinal cord; while phrenic nerve roots come from the spinal cord, the term alone does not specify the direct motor supply to the diaphragm. It does not identify the correct nerve explicitly.

Option 6: Thoracic nerve — There is no single named “thoracic nerve” that specifically innervates the diaphragm as the primary inspiratory muscle. Thoracic nerves (e.g., intercostal nerves) participate in breathing, but they do not constitute the prime mover’s sole innervation.

In summary, while nearby nerves contribute to the mechanics of breathing, the diaphragmatic motor supply that drives inspiration is specifically provided by the phrenic nerve, whereas the other options do not match this key anatomical relationship.

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

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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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