以下は「Wikipedia」の解説文となる。
「 The petrotympanic fissure (also known as the squamotympanic fissure or the glaserian fissure) is a fissure in the temporal bone that runs from the temporomandibular joint to the tympanic cavity.
The mandibular fossa is bounded, in front, by the articular tubercle; behind, by the tympanic part of the bone, which separates it from the external acoustic meatus; it is divided into two parts by a narrow slit, the petrotympanic fissure.
It opens just above and in front of the ring of bone into which the tympanic membrane is inserted; in this situation it is a mere slit about 2 mm. in length. It lodges the anterior process and anterior ligament of the malleus, and gives passage to the anterior tympanic branch of the internal maxillary artery.
【Eponym】
It is also known as the "Glaserian fissure", after Johann Glaser.
【Contents】
The contents of the fissure include communications of cranial nerve VII to the infratemporal fossa. A branch of cranial nerve VII, the chorda tympani, runs through the fissure to join with the lingual nerve providing special sensory (taste) innervation to the tongue. Anterior tympanic artery and tympanic veins also pass through the structure. Petrotympanic fissure contains some of the fibers of the anterior ligament of malleus, which run on the base of skull and eventually attach onto the spine of sphenoid bone.」
【 語 句 】
・temporal bone：側頭骨 ・temporomandibular joint：顎関節 ・tympanic cavity：鼓室 ・mandibular fossa：下顎窩 ・articular tubercle：関節結節 ・external acoustic meatus：外耳道 ・petrotympanic fissure：錐体鼓室裂 ・tympanic membrane：鼓膜 ・malleus：ツチ骨 ・anterior tympanic branch of the internal maxillary artery： ・eponym：名祖 ・cranial nerve Ⅶ：第7脳神経 ・infratemporal fossa：側頭下窩 ・chorda tympani：鼓索神経 ・lingual nerve：舌神経 ・anterior tympanic artery：前鼓室動脈 ・tympanic vein：鼓室静脈 ・spine of sphenoid bone：蝶形骨棘
■ 写真やイラストを掲載しているサイト ■
・ イラストや写真を掲載しているサイト-Ⅰ
・ イラストや写真を掲載しているサイト-Ⅱ
