tasneembanu
Forum Guru
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can someone tell me the nerve supply of the larynx,above the vocal cords and below the vocal cords.
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| kalsam
Forum Elite
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above-IX
below-X
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| tasneembanu
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Thanks Kalsam,when is ur test?
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| vrach
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Actually I think that CN IX doesn't supply to larynx at all. It only supplies to the posterior 1/3 of tongue, nasopharynx(along with V2), and oropharynx.
CN X: Internal branch of Superior laryngeal nerve provides sensory supply above vocal cords. External branch of same nerve provides motor innervation to Cricothyroid muscle. Recurrent laryngeal nerves supply the remaining laryngeal muscles and I guess sensory supply at and below the vocal cords.
While we are on the topic, Which nerve is most likely to be ligated during Thyroidectomy that leads to a monotone voice? What artey runs along with this nerve?
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| kalsam
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Guess I was too sleepy .exam in another two weeks time.. 
Vrach you r absolutely correct..
Above true vocal cord-supraglottis--X--superior laryngeal nerve
Below true vocal cord-Subglottis--X-recurrent laryngeal nerve
And,Which nerve is most likely to be ligated during Thyroidectomy that leads to a monotone voice?
Recurrent laryngeal Nerve
What artey runs along with this nerve?
Inferior Thyroid Artery.
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| DiaHuq
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Correct me if i'm wrong but injury to the external branch of superior laryngeal nerve(innervates the cricothyroid and is responsible for pitch) which runs with/crosses the superior thyroid artery that is responsible for monotone voice if injured.
Injury to the recurrent laryngeal nerve would cause hoarseness?
Right :?:
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| kalsam
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Oh..is it monotone and horseness different..???
Let me check..!!
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| kalsam
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Okie here I learned this today..
Hoarseness is breathy voice - damage to recurrent laryngeal nerve-artery which run along with it inferior thyroid artery.
Wereas,
Monotone - produce voice fatigue, difficulty in voice projection, and possible decrease in voice range, especially in upper singing registers
and this results as DiaHug said..injury to external branch of superior laryngeal nerve which is accompanied by superior thyroid artery.
Hope its clear now..
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| meghana jadhav
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to be very specific
The vagus nerve provides sensory and motor innervation to the larynx:
1. The recurrent laryngeal nerve supplies all the intrinsic muscles except the cricothyroid.
2. The cricothyroid muscle is supplied by the external branch of the superior laryngeal nerve.
3. Sensation above the vocal folds is supplied by the internal branch of the superior laryngeal nerve.
4. Sensation below the vocal folds is supplied by the recurrent laryngeal nerve.
The recurrent laryngeal nerve may be compromised by surgery, by aneurysm of the aorta or by carcinomas.
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megha
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| asg
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just wondering if anyone knows the parts of the GI the vagus supplies
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| krishie
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Recrrent laryngeal nerve damage causes hoarseness ans superior laryngeal damage causes monotone voice,but which one is affected commonly in thyroid surgeries?Is it the recurrent?
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krish
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| Ahab
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has to be the recurrent laryngeal nerve, the thyroid lies below the larynx thus it would take a messy surgery to damage the superior laryngeal nerve 
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| vrach
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I believe, according to Kaplan notes, its the external branch of the superior laryngeal nerve that runs with the Superior Thyroid artery, which is most frequently ligated in Thyroidectomies. :|
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