人大脑半球顶叶外侧面的隆凸形态

Parietal lobe convexity protuberance in human brain

目的探讨人大脑半球顶叶外侧面的脑回形态。方法肉眼观察、游标卡尺测量60例(120侧)福尔马林固定人脑顶叶脑回。结果顶叶外侧面可见恒定的隆凸,定位于中央后回中、下1/3交界处后方,面积在2cm×2cm至4.5cm×4.5cm的范围;体表投影在耳廓上端上方稍后约3cm处。主要由缘上回组成,该脑回呈多种形态,或呈弧形突向后上方,或为短脑回突入外侧沟末端,或同时突向后上方和前下方(外侧沟末端)等。当隆凸明显时,中央前、后回下部被推向前方稍弯,上部相对向后,整体呈s形。结论大脑半球顶叶外侧面存在一个恒定由缘上回为主构成的隆凸,可从颅、内外进行定位。

Objective To understand the gyri shape of parietal lobe convexity in human brain. Methods The configuration of gyri on the lateral surface of the parietal lobe of 60 formalinfixed cerebral hemispheres was observed by naked eyes, and measured with vernier caliper. Results There was a protuberance on the convexity of parietal lobe, posterior to lower portion of postcentral gyms. The area of the protuberance was about 2cm × 2cm to 4.5cm×4.5cm, 3cm above auricle. The protuberance mainly consisted of the supramarginal gyms, which was of various shapes arched superoposteriorly, or was a short gyms dropped superoposteriorly and inferiorly. When the protuberance more obviously protruded,the lower portions of the preeentral and postcentral gyri were pushed forwards and their upper portions were pushed backwards thus the whole shape of the precentral gyrus looked and postcentral gyrus looked like ＂s＂ shape. Conclusion There is a constant protuberance in the parietal lobe convexity which can be located from the structures inside and outside of skull.