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Parasympathetic Nervous System 3D

  • Description                                                                       
    • * Has preganglionic fibers running in cranial nerves III, VII, and IX that pass to cranial autonomic ganglia, where they synapse with postganglionic neurons.
    • * Has preganglionic fibers in CN X and in pelvic splanchnic nerves that pass to terminal ganglia, where they synapse.
    • * Has parasympathetic fibers in the vagus nerve (CN X) that supply most of the thoracic and abdominal viscera.
    • * Decreases the heart rate, constricts bronchial lumen, and causes vasoconstriction of the coronary arteries.

 

  • Right Vagus Nerve:
    • * Gives rise to the right recurrent laryngeal nerve, which hooks around the right subclavian artery and ascends into the neck between the trachea and the esophagus.
    • * Crosses anterior to the right subclavian artery, runs posterior to the SVC, and descends at the right surface of the trachea and then posterior to the right main bronchus.
    • * Contributes to the cardiac, pulmonary, and esophageal plexuses.
    • * Forms the posterior vagal trunk at the lower part of the esophagus and enters the abdomen through the esophageal hiatus.

 

  • Left Vagus Nerve:
    • * Enters the thorax between the left common carotid and subclavian arteries and behind the left brachiocephalic vein and descends on the arch of the aorta.
    • * Gives rise to the left recurrent laryngeal nerve, which hooks around the arch of the aorta to the left of the ligamentum arteriosum.
    • * Ascends through the superior mediastinum and the neck in a groove between the trachea and esophagus.
    • * Gives off the thoracic cardiac branches, breaks up into the pulmonary plexuses, continues into the esophageal plexus, and then forms the anterior vagal trunk.

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  • Description                                                                       
    • * Has preganglionic fibers running in cranial nerves III, VII, and IX that pass to cranial autonomic ganglia, where they synapse with postganglionic neurons.
    • * Has preganglionic fibers in CN X and in pelvic splanchnic nerves that pass to terminal ganglia, where they synapse.
    • * Has parasympathetic fibers in the vagus nerve (CN X) that supply most of the thoracic and abdominal viscera.
    • * Decreases the heart rate, constricts bronchial lumen, and causes vasoconstriction of the coronary arteries.

 

  • Right Vagus Nerve:
    • * Gives rise to the right recurrent laryngeal nerve, which hooks around the right subclavian artery and ascends into the neck between the trachea and the esophagus.
    • * Crosses anterior to the right subclavian artery, runs posterior to the SVC, and descends at the right surface of the trachea and then posterior to the right main bronchus.
    • * Contributes to the cardiac, pulmonary, and esophageal plexuses.
    • * Forms the posterior vagal trunk at the lower part of the esophagus and enters the abdomen through the esophageal hiatus.

 

  • Left Vagus Nerve:
    • * Enters the thorax between the left common carotid and subclavian arteries and behind the left brachiocephalic vein and descends on the arch of the aorta.
    • * Gives rise to the left recurrent laryngeal nerve, which hooks around the arch of the aorta to the left of the ligamentum arteriosum.
    • * Ascends through the superior mediastinum and the neck in a groove between the trachea and esophagus.
    • * Gives off the thoracic cardiac branches, breaks up into the pulmonary plexuses, continues into the esophageal plexus, and then forms the anterior vagal trunk.

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