Lesser petrosal nerve
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The lesser petrosal nerve carries carries preganglionic parasympathetic (secretory) fibers from both the tympanic plexus (glossopharyngeal nerve) and the nervus intermedius (facial nerve),The It is considered a branch of the glossopharyngeal nerve although it receives contributions from two further sources 3:
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tympanic plexus
arises from: glossopharyngeal nerve via Jacobson's nerve.Some fibres - nervus intermedius: facial nerve
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auricular branch (Arnold’s nerve) of the
lesser petrosalvague nerveoriginate from thegeniculate ganglion, others from the tympanic plexus.
The nerve passes forwards through its own canal back intoto the floor of the middle cranial fossa, where it is located between the two layers of the dura mater, passing between the petrous branch of the middle meningeal artery (medial) and the superior tympanic artery (lateral) 3. It forwards roughly in parallel to the greater petrosal nerve to exit the skull via foramen ovale to eventually join the otic ganglion.
-<p>The <strong>lesser petrosal nerve</strong> carries parasympathetic (secretory) fibers from both the <a href="/articles/tympanic-plexus">tympanic plexus</a> (<a title="Glossopharyngeal nerve" href="/articles/glossopharyngeal-nerve">glossopharyngeal nerve</a>) and the <a href="/articles/nervus-intermedius">nervus intermedius</a> (<a title="Facial nerve" href="/articles/facial-nerve">facial nerve</a>), to the <a href="/articles/parotid-gland">parotid gland</a>. The tympanic plexus arises from glossopharyngeal nerve via <a href="/articles/jacobson-nerve">Jacobson's nerve</a>.</p><p>Some fibres of the lesser petrosal nerve originate from the <a href="/articles/geniculate-ganglion">geniculate ganglion</a>, others from the tympanic plexus. The nerve passes forwards through its own canal back into the <a href="/articles/middle-cranial-fossa">middle cranial fossa</a>, where it is located between the two layers of the <a href="/articles/dura-mater">dura mater</a>, passing forwards to exit the <a href="/articles/skull">skull</a> via <a href="/articles/foramen-ovale-skull">foramen ovale</a> to eventually join the <a href="/articles/otic-ganglion">otic ganglion</a>.</p>- +<p>The <strong>lesser petrosal nerve</strong> carries preganglionic parasympathetic fibres to the <a title="Parotid gland" href="/articles/parotid-gland">parotid gland</a>. It is considered a branch of the <a href="/articles/glossopharyngeal-nerve">glossopharyngeal nerve</a> although it receives contributions from two further sources <sup>3</sup>:</p><ol>
- +<li>
- +<a href="/articles/tympanic-plexus">tympanic plexus</a>: glossopharyngeal nerve via <a href="/articles/jacobson-nerve">Jacobson's nerve</a> (main contribution)</li>
- +<li>
- +<a href="/articles/nervus-intermedius">nervus intermedius</a>: facial nerve</li>
- +<li>
- +<a title="Auricular branch" href="/articles/arnolds-nerve-2">auricular branch</a> (Arnold’s nerve) of the vague nerve</li>
- +</ol><p>The nerve passes through its own canal to the floor of the <a href="/articles/middle-cranial-fossa">middle cranial fossa</a>, where it is located between the two layers of the <a href="/articles/dura-mater">dura mater</a> between the petrous branch of the <a title="Middle meningeal artery" href="/articles/middle-meningeal-artery">middle meningeal artery</a> (medial) and the <a title="superior tympanic artery" href="/articles/superior-tympanic-artery">superior tympanic artery</a> (lateral) <sup>3</sup>. It forwards roughly in parallel to the <a title="greater petrosal nerve" href="/articles/greater-superficial-petrosal-nerve">greater petrosal nerve</a> to exit the <a href="/articles/skull">skull</a> via <a href="/articles/foramen-ovale-skull">foramen ovale</a> to eventually join the <a href="/articles/otic-ganglion">otic ganglion</a>.</p>
References changed:
- 3. Mavridis I N, Pyrgelis E. Clinical Anatomy of the Lesser Petrosal Nerve, Arch Neurosci. 2016 ; 3(2):e34168. doi: 10.5812/archneurosci.34168 <a href="https://sites.kowsarpub.com/ans/articles/20574.html">Full text</a>
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