Plan of the upper portions of the glossopharyngeal, vagus, and accessory nerves.
Transverse section of medulla oblongata below the middle of the olive. ("Nucleus ambiguus" labeled at center right.)
The digestive tract, with the esophagus marked in red
H&E stained fibers of the vagus nerve (bottom right) innervate the sinoatrial node tissue (middle left)
Section of the medulla oblongata at about the middle of the olive.
The esophagus is constricted in three places.
Inferior view of the human brain, with the cranial nerves labeled.
The cranial nerve nuclei schematically represented; dorsal view. Motor nuclei in red; sensory in blue.
A mass seen during an endoscopy and an ultrasound of the mass conducted during the endoscopy session.
Section of the neck at about the level of the sixth cervical vertebra
Nuclei of origin of cranial motor nerves schematically represented; lateral view.
Transverse section of thorax, showing relations of pulmonary artery
The formatio reticularis of the medulla oblongata, shown by a transverse section passing through the middle of the olive.
The arch of the aorta, and its branches
Dura mater and its processes exposed by removing part of the right half of the skull, and the brain
The tracheobronchial lymph glands
Section of the medulla oblongata at about the middle of the olive
Hind- and mid-brains; postero-lateral view
Upper part of medulla spinalis and hind- and mid-brains; posterior aspect, exposed in situ
The right sympathetic chain and its connections with the thoracic, abdominal, and pelvic plexuses
The celiac ganglia with the sympathetic plexuses of the abdominal viscera radiating from the ganglia
The position and relation of the esophagus in the cervical region and in the posterior mediastinum, seen from behind
The thyroid gland and its relations
The thymus of a full-term fetus, exposed in situ
Deep dissection of vagus nerve
Vagus nerve – dissection

The sensory fibers originate from neurons of the nodose ganglion, whereas the motor fibers come from neurons of the dorsal motor nucleus of the vagus and the nucleus ambiguus.

- Vagus nerve

This nucleus gives rise to the branchial efferent motor fibers of the vagus nerve (CN X) terminating in the laryngeal, pharyngeal muscles, and musculus uvulae; as well as to the efferent motor fibers of the glossopharyngeal nerve (CN IX) terminating in the stylopharyngeus muscle.

- Nucleus ambiguus

The 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 esophagus.

- Vagus nerve

The vagus also supplies the upper part of the esophagus, and other parts of the pharynx and larynx.

- Nucleus ambiguus

Its smooth muscle is innervated by involuntary nerves (sympathetic nerves via the sympathetic trunk and parasympathetic nerves via the vagus nerve) and in addition voluntary nerves (lower motor neurons) which are carried in the vagus nerve to innervate its striated muscle.

- Esophagus

The upper striated muscle, and upper esophageal sphincter, are supplied by neurons with bodies in the nucleus ambiguus, whereas fibers that supply the smooth muscle and lower esophageal sphincter have bodies situated in the dorsal motor nucleus.

- Esophagus
Plan of the upper portions of the glossopharyngeal, vagus, and accessory nerves.

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