Vagus nerve
The vagus nerve is tenth of twelve cranial nerves and the only nerve that starts in the brainstem (somewhere in the medulla oblongata) and extends way down past the head, all the way down to the abdomen. The vagus nerve is arguably the single most important nerve in the body.The medieval Latin word vagus means literally "wandering" (the words "vagrant" and "vagabond" come from the same root).
This nerve supplies motor and sensory parasympathetic fibres to pretty much everything from the neck down to the first third of the transverse colon. In this capacity, it is involved in, amongst other things, such varied tasks as heart rate, gastrointestinal peristalsis, sweating and speech (via the recurrent laryngeal nerve).
The vagus also controls a few skeletal muscles, namely:
- levator veli palatini muscle
- salpingopharyngeus muscle
- stylopharyngeus muscle
- palatoglossus muscle
- palatopharyngeus muscle
- superior, middle and inferior pharyngeal constrictors
- muscles of the larynx (speech).
It also receives some sensation from the outer ear and part of the meninges.
Links
