Whalen L R, Kitchell R L
Am J Vet Res. 1983 Apr;44(4):628-34.
The investigation used 2 methods to study the cutaneous innervation of the concave surface of the pinna of the dog: electrophysiologic and behavioral. The cutaneous innervation of the external ear canal was studied, using electrophysiologic methods. On one side of each dog, the area of remaining sensitivity for the 3 internal auricular branches of the facial nerve (InAuB-FN) was determined by sectioning the rostral auricular nerve, dorsal cutaneous branch of the second cervical nerve, and great auricular nerve and then examining the dogs 1 week later. The cutaneous area (CA) of each branch of the InAuB-FN was then determined electrophysiologically. These individual CA were combined to obtain a composite cutaneous area (Comp-CA) for the InAuB-FN. By comparing the Comp-CA with the area of remaining sensitivity, it was determined that they defined essentially the same regions. On the opposite side of each dog, the InAuB-FN were surgically transected and the resultant areas of anesthesia were determined approximately 1 week after the sectioning was done. The cutaneous region thus delineated represented a zone solely innervated by these branches of the FN. Next, the CA for the rostral auricular nerve, dorsal cutaneous branch of the second cervical nerve, and great auricular nerve to the pinna's concave surface were determined electrophysiologically in each dog. The cutaneous zone enclosed by the margins of the CA of these 3 nerves represented the composite autonomous zone for the InAuB-FN. The behaviorally determined area of anesthesia was essentially the same area as the composite autonomous zone. The skin lining the vertical portion of the external ear canal was supplied by all 3 branches of the InAuB-FN. The skin lining the horizontal portion of the external ear canal was supplied by the lateral branch of the InAuB-FN and the external acoustic meatus branch of the auriculotemporal nerve.
电生理学方法和行为学方法。采用电生理学方法研究外耳道的皮肤神经支配。在每只犬的一侧，通过切断耳前神经、第二颈神经的背侧皮支和耳大神经，然后在1周后检查这些犬，来确定面神经的3支耳内神经（InAuB - FN）的剩余敏感区域。然后通过电生理学方法确定InAuB - FN各分支的皮肤区域（CA）。将这些个体的CA合并，以获得InAuB - FN的复合皮肤区域（Comp - CA）。通过将Comp - CA与剩余敏感区域进行比较，确定它们定义的区域基本相同。在每只犬的另一侧，手术切断InAuB - FN，并在切断后约1周确定由此产生的麻醉区域。这样划定的皮肤区域代表了仅由FN的这些分支支配的区域。接下来，通过电生理学方法确定每只犬的耳前神经、第二颈神经的背侧皮支和支配耳廓凹面的耳大神经的CA。这3条神经的CA边缘所包围的皮肤区域代表了InAuB - FN的复合自主区域。行为学确定的麻醉区域与复合自主区域基本相同。外耳道垂直部分的皮肤由InAuB - FN的所有3个分支供应。外耳道水平部分的皮肤由InAuB - FN的外侧支和耳颞神经的外耳道支供应。
