Fetal facial nerve course in the ear region revisited

被引:7
|
作者
Jin, Zhe Wu [1 ]
Cho, Kwang Ho [2 ]
Abe, Hiroshi [3 ]
Katori, Yukio [4 ]
Murakami, Gen [5 ]
Francisco Rodriguez-Vazquez, Jose [6 ]
机构
[1] Yanbian Univ, Coll Med, Dept Anat Histol & Embryol, Yanji, Jilin, Peoples R China
[2] Wonkwang Univ, Sch Med & Hosp, Inst Wonkwang Med Sci, Dept Neurol, 895 Muwang Ro, Iksan Si 54538, Jeollabuk Do, South Korea
[3] Akita Univ, Grad Sch Med, Dept Anat, Akita 0108502, Japan
[4] Tohoku Univ, Grad Sch Med, Dept Otolaryngol Head & Neck Surg, Sendai, Miyagi, Japan
[5] Iwamizawa Kojin Kai Hosp, Div Internal Med, Iwamizawa 0680833, Japan
[6] Univ Complutense Madrid, Inst Embryol, Dept Anat & Human Embryol, Madrid, Spain
关键词
Facial nerve; Genu; Greater petrosal nerve; Chorda tympani nerve; Auricular branch of the vagus nerve; Topographical anatomy; Human fetus; EMBRYONIC PERIOD; CHICK HINDLIMB; GROWTH; PROPER;
D O I
10.1007/s00276-017-1818-y
中图分类号
R602 [外科病理学、解剖学]; R32 [人体形态学];
学科分类号
100101 ;
摘要
The aim of this study was to re-examine the structures that determine course of the facial nerve (FN) in the fetal ear region. We used sagittal or horizontal sections of 28 human fetuses at 7-8, 12-16, and 25-37 weeks. The FN and the chorda tympani nerve ran almost parallel until 7 weeks. The greater petrosal nerve (GPN) ran vertical to the distal FN course due to the trigeminal nerve ganglion being medial to the geniculate ganglion at 7 weeks. Afterwards, due to the radical growth of the former ganglion, the GPN became an anterior continuation of the FN. The lesser petrosal nerve ran straight, parallel to the FN at 7 weeks, but later, it started to wind along the otic capsule, possibly due to the upward invasion of the tympanic cavity epithelium. Notably, the chorda tympanic nerve origin from the FN, and the crossing between the vagus nerve branch and the FN, was located outside of the temporal bone even at 37 weeks. The second knee of the FN was not evident, in contrast to the acute anterior turn below the chorda tympanic nerve origin. In all examined fetuses, the apex of the cochlea did not face the middle cranial fossa, but the tympanic cavity. Topographical relation among the FN and related nerves in the ear region seemed not to be established in the fetal age but after birth depending on growth of the cranial fossa.
引用
收藏
页码:885 / 895
页数:11
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