Renegade
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Topics: 18
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"mjl1717" wrote:
What is the EXACT inervation for sweat glands, sebacous glands and piloerector muscles??
Sweat glands...
-Apocrine (the ones in axillae) get fibers from the sympathetic that join skeletal nerves through the grey rami and thus travel with them to «some blood vessels, piloerector muscles and sweat glands all over the body» -Guyton. These fibers are adrenergic.
-Eccrin (the regular ones, in forehead, arms, soles...) also get nerves from the sympathetic , and probably its fibers travel with skeletal nerves as well (since 8% of the fibers in skeletal nerves are sympathetic -Guyton). However, these fibers are cholinergic ones; plus, they're controlled by areas in CNS usually associated with parasympathetic system (parts of hypothalamus, for instance), unlike apocrine glands. The exception: the ones in our soles and palms get nerves by adrenergic sympathetic fibers (I don't know what areas in CNS control them, I believe they're parasympathetic ones as well), which cause the «adrenergic sweating» mentioned in Goodman and Gillman's ANS 'table' (the same sweating Ferris Bueller recommended before his day off :wink: ).
Piloerector muscles - Ok, this one's a problem. According to Guyton, their inervation is also cholinergic-through-sympathetic fibers, just like most eccrine glands. Goodman and Gillman's ANS 'table', however, states that they react to adrenergic impulses...
To sum up, since muscles and sweat glands are pretty much all over the body and, unless I'm mistaken, the parasympathetic doesn't reach our limbs' skin, the inervation is always by skeletal nerve-transported sympathetic fibers. Adrenergic and parasympathetic-controled for palms & soles, adrenergic and sympathetic-controled for apocrine glands, and cholinergic and parasympathetic-controled for the rest (which makes sense, since parasympathetic system controls body temperature).
Sebacious glands - Can't find info on them. I really don't know. Any info on these, anyone?..
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| rubensssss
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Sweat glands have a sympathetic inervation. Rememmber running sweting. No parasympathetic action.
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