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The average distance between the opening of the stylomastoid foramen and the styloid process is around 0.7 mm or 0.8 mm in adults, but may decrease to around 0.2 mm during aging. [1] The stylomastoid foramen transmits the facial nerve, [2] [3] and the stylomastoid artery. [3] These 2 structures lie directly next to each other. [3]
The proximal portion of the facial canal is termed the horizontal part.It commences at the introitus of facial canal at the distal end of the internal auditory meatus. The horizontal part is further subdivided into two crura: the proximal/medial [4] anteriolaterally [5] directed medial crus (or labyrinthine segment [5]), and the distal/lateral [4] posteriolaterally [5] directed lateral crus ...
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The digastric branch of facial nerve provides motor innervation to the posterior belly of the digastric muscle. [1] [2] It branches from the facial nerve (CN VII) near to the stylomastoid foramen [1] as the CN VII exits the facial canal (it thus branches proximal to the parotid plexus of facial nerve). [2]
The stylomastoid artery enters the stylomastoid foramen and supplies the tympanic cavity, the tympanic antrum and mastoid cells, and the semicircular canals. It is a branch of the posterior auricular artery , and thus part of the external carotid arterial system.
The aim of decompression surgery is to open the affected area and nerve sheath, and to release pressure. This reduces compression on the nerve fibers, improves blood circulation and minimizes damage to distal nerve fibers. Several surgicala approaches are described to achieve decompression: Middle cranial fossa approach [2] Translabarynthine ...
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The cells receive arterial supply from the stylomastoid branch of the occipital artery or posterior auricular artery, and (sometimes) a mastoid branch of the occipital artery. [1]: 749 The superior petrosal sinus receives venous drainage from the mastoid air cells (mastoid infection may thus lead to a cerebellar abscess). [2]: 443