房室束横断面大多为三角形，外包有疏松结缔组织鞘。
His's bundle surround by loose connective tissues, was mostly triangle in shape.
目的观察研究腋神经中支配三角肌的功能束（组）于四边孔平面在神经干中的分布规律及组织学特征。
Objective To observe and study the distribution and histological feature of the fascicular groups to deltoid muscle in axillary nerve at the level of quadrilateral zone.
主要产品有：三角模、套片模、六角六片组合模、强束模及各种异形特殊模具。
The main products are: triangular mode, Presentation mode chip, hexagonal 6 combination mode, strong mode and various special-shaped beam special mold.
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