- end p. a part of the spermatozoon consisting of an axoneme surrounded only by the flagellar membrane.
- Fab p. SYN: Fab fragment.
- Fc p. SYN: Fc fragment.
- middle p. a part of the spermatozoon characterized by an axoneme and by a sheath of mitochondria arranged in a tight helix.
- principal p. the principal part of the spermatozoon, which is about 45 μm long and has a characteristic fibrous sheath surrounding the axoneme.
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(pēs) a part or portion.Medical dictionary. 2011.