Question 1

Question

A comparative anatomist is evaluating the evolutionary significance of the recurrent laryngeal nerve's circuitous route in humans. A patient with thyroid cancer has involvement of this nerve. Synthesizing embryological and comparative data, which explanation best accounts for this anatomical arrangement?

Accepted Answer

The nerve originally supplied gills in fish ancestors and maintained its relationship with vascular structures during heart descent

Answer

The nerve follows the sixth pharyngeal arch artery which becomes the ductus arteriosus in fetal life

Answer

The nerve pathway represents failed migration of neural crest cells during development

Answer

The nerve loops around subclavian artery due to differential growth of cervical versus thoracic vertebrae

Comparative Anatomy — MCQs

Comparative Anatomy — MCQs

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