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. 2022 Jan 25;40(4):551–560. doi: 10.5534/wjmh.210119

Fig. 3. Schematic diagram of the ultrastructure of the sperm flagella. (A) Sperm. (B) Internal cross-section of sperm flagella. (C) Dynein and its related structures. The dark blue, light blue, and red parts are IDA1, IDA2, and IDA3, respectively, in a 3-3-2 arrangement. The red text in (B) is IDA, including IDA1, 2 and 3, and the red text in (C) is IDA3, which is the expression site of DNAH1. The green, brown, grey, and yellow parts are ODA, RS, MTDS or CP, and N-DRC, respectively. The defect of DNAH1 results in a deletion of IDA3, which becomes a 3-2-1 structure and leads to the loss of CP. Dynein and its related structures repeat every 96 nm. IDA: inner dynein arm, ODA: outer dyneim arm, RS: radial spoke, MTDs: microtubular doublets, CP: central pair, N-DRC: nexin-dynein regulatory complex, DNAH1: dynein axonemal heavy chain 1.

Fig. 3