lesser petrosal nerve


Also found in: Wikipedia.

less·er pe·tro·sal nerve

[TA]
the parasympathetic root of the otic ganglion, derived from the tympanic plexus; it leaves the tympanic cavity through the canal for the lesser petrosal nerve and passes within the cranium to the sphenopetrosal fissure, or to the foramen ovale, or to the petrosal foramen through which it descends to reach the otic ganglion; conveys presynaptic parasympathetic fibers from the glossopharyngeal nerve concerned with secretomotor innervation of the parotid gland.

lesser petrosal nerve

a small nerve originating in the tympanic plexus that carries preganglionic parasympathetic fibers to the otic ganglion.

less·er pe·tro·sal nerve

(les'ĕr pĕ-trō'săl nĕrv) [TA]
The parasympathetic root of the otic ganglion, derived from the tympanic plexus; it leaves the tympanic cavity through the canal for the lesser petrosal nerve and passes within the cranium to the sphenopetrosal fissure, or to the foramen ovale, or to the petrosal foramen, through which it descends to reach the otic ganglion; conveys presynaptic parasympathetic fibers from the glossopharyngeal nerve concerned with secretomotor innervation of the parotid gland.
Synonym(s): lesser superficial petrosal nerve, nervus petrosus minor, parasympathetic root of otic ganglion, radix parasympathica ganglii otici.
References in periodicals archive ?
The parasympathetic division of cranial nerve VII supplies fibers that contribute to the greater petrosal nerve (which supplies the lacrimal gland), the lesser petrosal nerve (which supplies the parotid gland), and the chorda tympani (which supplies the submandibular and sublingual glands).
the greater superficial petrosal nerve, which supplies taste fibers to the palatal mucosa, preganglionic parasympathetic axons to the pterygopalatine ganglion, and postganglionic axons to the lacrimal glands, nasal glands, and palatine mucosal glands; it also communicates with the lesser petrosal nerve (2)
A branch from the geniculate ganglion near the greater superficial petrosal nerve, which developed earlier, is reduced to a communication as the tympanic plexus and the lesser petrosal nerve develop from the IXth cranial nerve.
The innervation of the parotid involves the preganglionic parasympathetic portion of the gland, beginning in the inferior salivatory nucleus and passing via the glossopharyngeal nerve, the tympanic plexus, and the lesser petrosal nerve to the oticganglion.
After peeling the middle fossa and the outer layer on the CS, the III, IV, V1, V2, V3, greater and lesser petrosal nerves and venous channels of the CS are identified covered by the inner layer.
This subgroup also included intratympanic, attic, and hypotympanic meningiomas and those of the geniculate ganglion, the sulci of the greater and lesser petrosal nerves, the jugular foramen, the internal acoustic meatus, the mastoid process, and the petrous bone.