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The pyriform sinus (also piriform recess, piriform sinus, piriform fossa, or smuggler's fossa) is a small recess on either side of the laryngeal inlet. It is bounded medially by the aryepiglottic fold, and laterally by the thyroid cartilage and thyrohyoid membrane. [1] The fossae are involved in speech.
Injections deliver medication directly to the piriformis muscle through a needle. The needle is placed into the piriformis muscle with image guidance such as fluoroscopy, ultrasound, CT, or MRI. [ 2 ] [ 30 ] Ultrasound is a popular choice due to a balance of accuracy, accessibility, lack of radiation exposure, and affordability.
Piriform cortex, a region in the brain; Piriformis muscle, a gluteal muscle Piriformis syndrome, a neuromuscular disorder in which the piriformis muscle compresses the sciatic nerve; Piriform sinus, piriform recess or piriform fossa, synonyms referring to one of the four sites of the hypopharynx
Ultrasound-guidance is a popular choice for injections, [5] but injections can also be done under CT or MRI-guidance. [ 4 ] [ 6 ] Controlled studies have found that for patients with suspected piriformis syndrome, botox injections into the piriformis are more effective than a placebo [ 22 ] and also more effective than just an anesthetic block ...
The piriform cortex contains a critical, functionally defined epileptogenic trigger zone, "Area Tempestas". [6] From this site in piriform cortex chemical and electrically evoked seizures can be triggered. It is the site of action for the proconvulsant action of chemoconvulsants. [7]
Piriformis syndrome occurs when the piriformis irritates the sciatic nerve, which comes into the gluteal region beneath the muscle, causing pain in the buttocks and referred pain along the sciatic nerve. [8] This referred pain is known as sciatica. Seventeen percent of the population has their sciatic nerve coursing through the piriformis muscle.
Behind the ostium of the eustachian tube (ostium pharyngeum tuba auditiva) is a deep recess, the pharyngeal recess (fossa of Rosenmüller). Clinical significance
Intrathecal administration is a route of administration for drugs via an injection into the spinal canal, or into the subarachnoid space so that it reaches the cerebrospinal fluid (CSF). It is useful in several applications, such as for spinal anesthesia, chemotherapy, or pain management. This route is also used to introduce drugs that fight ...