A Medical Student Is Confused When Learning That the Muscle

question 1

Multiple Choice

A medical student is confused when learning that the muscle of the diaphragm is innervated by the phrenic nerves,based on the level of origin of these nerves from the CNS.What is the explanation of how this innervation occurs during embryogenesis?

• A) The phrenic nerves arise in the cervical region in association with the septum transversum and cervical myotomes, and as the myotomes migrate more caudally, they carry their innervation with them.
• B) The muscle of the diaphragm arise late in development and cannot grow back to the thoracic spinal cord because the spinal nerves have already formed at this level, so they grow more cranially to the cervical region.
• C) The thoracic nerves initially supplying the diaphragm die during development and are replaced by new nerves that grow from the cervical region.
• D) The muscle of the diaphragm arises from the thoracic myotomes but secretes a chemoattractant that specifically attracts cervical spinal nerves.
• E) The muscle of the diaphragm arises from the thoracic myotomes but secretes a chemorepellent that specifically repels thoracic spinal nerves.

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Definitions:

Extended Gaze

A prolonged look or stare, often used in psychological research to study attachment, social cues, and interpersonal attraction.

Source Amnesia

Source amnesia is the inability to remember where, when, or how previously learned information has been acquired, while retaining the factual knowledge.

False Memory

A psychological phenomenon where an individual recalls something that did not happen or recalls it differently from the way it actually happened.

Source Amnesia

Source amnesia is the inability to remember where, when, or how previously learned information was acquired, while retaining the factual knowledge.