Comparative analysis of mammalian sperm ultrastructure reveals relationships between sperm morphology, mitochondrial functions and motility

Table 2 Correlations between slopes of the sperm ultrastructures and the sperm morphology

Sperm morphology Ultrastructures	Head length	Head width	Midpiece length	Principal length	Flagellar length	Flagellum:head ratio
ODFs	0.37	0.16	0.18	−0.01	0.07	− 0.06
Axonome	−0.15	0.24	−0.70^*	− 0.78^**	−0.78^**	− 0.72^*
Fibrous sheath	0.14	0.06	−0.44	−0.63	− 0.58	−0.59
Mitochondrial sheath	−0.18	−0.02	− 0.01	0.28	0.18	0.24
odf1	0.44	0.11	0.20	−0.04	0.06	−0.08
odf2	0.45	0.26	0.15	−0.04	0.04	−0.12
odf3	0.31	0.04	0.20	−0.08	0.03	−0.08
odf4	0.29	0.13	0.19	−0.02	0.06	−0.05
odf5	0.45	0.10	0.25	0.02	0.11	−0.03
odf6	0.45	0.12	0.22	−0.02	0.08	−0.07
odf7	0.36	0.19	0.15	−0.09	0.01	−0.13
odf8	0.45	0.02	0.21	−0.16	−0.02	− 0.17
odf9	0.39	0.36	0.03	−0.10	−0.05	− 0.19
t-odf area	0.56	0.22	0.27	0.02	0.12	−0.07

*P<0.05, **P<0.01. t-odf area = (odf1 + odf2 + odf3 + odf4 + odf5 + odf6 + odf7 + odf8 + odf9) area