Petrosal Placode
Petrosal may refer to: * Inferior petrosal sinus * Petrosal process * Petrosal nerve (other) * Petrous ganglion * Petrous part of the temporal bone The petrous part of the temporal bone is pyramid-shaped and is wedged in at the base of the skull between the sphenoid and occipital bones. Directed medially, forward, and a little upward, it presents a base, an apex, three surfaces, and three an ...

Inferior Petrosal Sinus
The inferior petrosal sinuses are two small sinuses situated on the inferior border of the petrous part of the temporal bone, one on each side. Each inferior petrosal sinus drains the cavernous sinus into the internal jugular vein. Structure The inferior petrosal sinus is situated in the inferior petrosal sulcus, formed by the junction of the petrous part of the temporal bone with the basilar part of the occipital bone. It begins below and behind the cavernous sinus and, passing through the anterior part of the jugular foramen, ends in the superior bulb of the internal jugular vein. Function The inferior petrosal sinus receives the internal auditory veins and also veins from the medulla oblongata, pons, and under surface of the cerebellum. Additional images File:Gray568.png, Sagittal section of the skull, showing the sinuses of the dura. See also * Dural venous sinuses The dural venous sinuses (also called dural sinuses, cerebral sinuses, or cranial sinuses) are veno ...
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Petrosal Process
The petrosal process is a sharp process below the notch for the passage of the abducent nerve on either side of the dorsum sellae of the sphenoid bone. It articulates with the apex of the petrous portion of the temporal bone The temporal bones are situated at the sides and base of the skull, and lateral to the temporal lobes of the cerebral cortex. The temporal bones are overlaid by the sides of the head known as the temples, and house the structures of the ears. ..., and forms the medial boundary of the foramen lacerum. References Bones of the head and neck {{Portal bar, Anatomy ...
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Petrosal Nerve (other)
Petrosal nerve may refer to: *Deep petrosal nerve Derived from the symp. plexus around I.C.A. -Unite with the greater superficial petrosal n. (parasymp.) To form the nerve of pterygoid canal (vidian n. ) which passes through the pterygoid canal to reach the spheno- palatine ganglion -Enter the spheno-palatine ganglion in the pterygo-palatine fossa (no relay) *Greater petrosal nerve (also known as the greater superficial petrosal nerve) -Parasymp. N. from nervus intermedius -Origin: geniculate ganglion of facial n. -Course: Leave petrous bone via its hiatus to reach middle cranial fossa Then run in its groove to enter f.lacerum to join with deep petrosal n. to form n. to pterygoid canal ( vidian n.) -vidian n. run to reach pterygopalatine fossa -in fossa the parasymp. Fiber of G.S. petrosal n. relay in sphenopalatine ganglion Post ganglionic fibers supply : Mucous gland of palat , nose , nasophartnx & lacrimal gland Lesser petrosal nerve The lesser petrosal nerve (also known ...
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Petrous Ganglion
The inferior ganglion of the glossopharyngeal nerve (petrosal ganglion) is a sensory ganglion. It is larger than and inferior to the superior ganglion of the glossopharyngeal nerve. It is located within the jugular foramen. The pseudounipolar neurons of the inferior ganglion of the glossopharyngeal nerve provide sensory innervation to areas around the tongue and pharynx. More specifically: # innervation of taste buds on the posterior 1/3 of tongue # general sensory innervation of posterior 1/3 of tongue, soft palate, palatine tonsils, upper pharynx and Eustachian tubes # innervation of baroreceptor cells in the carotid sinus # innervation of glomus type I chemoreceptor cells in the carotid body The central processes of the neurons which provide taste sensation synapse in the rostral portion of the solitary nucleus (also called the gustatory nucleus). The central processes of the neurons which provide general sensory information synapse in the spinal trigeminal nucleus. Finally ...
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