Findlay G H, Harris W F
Am J Phys Anthropol. 1977 May;46(3):427-37. doi: 10.1002/ajpa.1330460308.
Hair slope, whorl, cross and field formation is expressible in a topological form. The mathematical description required suggests an origin for the patterns in a growth process occurring in the upper dermis which determines the patterns of the hair slope. The formulae proposed by Euler, Poincaré and Ludwig are adopted as a descriptive method for the analysis of hair patterning resulting from hair slope. A unitary theory for hair streams and fingerprint patterns is suggested by the discovery, on one remarkable human foetus, of sites where epidermal ridges and convergent hair whorls were combined. Placement of the parietal scalp whorl in man is linked to hominid brain and skull development, and its associated hair field is noted to be bipartite, as revealed through patterns of differential hair loss.
发坡、发旋、交叉和发区形成可用拓扑形式表示。所需的数学描述表明，这些模式起源于上真皮层发生的生长过程，该过程决定了发坡模式。采用欧拉、庞加莱和路德维希提出的公式作为描述方法，来分析由发坡产生的毛发图案。在一个非凡的人类胎儿身上发现了表皮嵴和汇聚发旋相结合的部位，由此提出了一种关于发流和指纹图案的统一理论。人类顶骨头皮发旋的位置与原始人类大脑和颅骨发育有关，通过不同脱发模式揭示，其相关发区呈二分法。
