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Midpiece and tail from the same sperm

Another EM of the embryo shown in Figure 3 showing the midpiece (Mp) and tail (T) of the same sperm within the cytoplasm (Cy) (original magnification x 25,200). Mitochondria, dense fibers, fibrous sheath, and axoneme are evident beneath the cell membrane.

SS = subzonal space
Z = zona pellucida

From: Sathananthan and Chen, 1986. Reproduced with permission of the publisher, John Wiley and Sons.

Keywords: axoneme, dense fiber, fibrous sheath, midpiece, mitochondria, sperm tail, subzonal space, zona pellucida

Source: The Virtual Human Embryo.