1. Its structure is similar to that of a centriole.

2. In animals it is associated with centriole , while in plant and fungal cells spindle formation is associated with reions called microtubule organizing centers.

3. The disappearing of the centriolar adjunct and proximal centriole in succession might be considered as a sign of being mature completely of the spermatid.

4. The centriole lies outside the nucleus of animal cells and many fungal and protoctist cells, but is absent in cells of most higher plants.

5. The distal centriole is like a bell, with its top connecting to the proximal centriole and with the entrance of its bottom connecting to the axoneme of the sperm tail.

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6. The midpiece of spermatozoon is short. The proximal centriole and distal centriole are perpendicular to each other.

7. The distal centriole divides into nine columns, each of which adheres to the inner side of every segmented column.

8. A single centriole appears at the late stage of spermatid.

9. The centriolar complex, which is located in the implantation fossa, consists of basal body and degenerated proximal centriole.

10. It has the same structure as the mature parental centriole , but is only about half its length.

11. The centriolar complex was inside implantation fossa and consisted of proximal centriole and basal body.

12. The spermatocyte is of polygonal shape, which contains a centriole appendage formed by the chromatoid body's surrounding the centriole.

13. The midpiece consists of 5 or 6 mitochondria, a pair of centriole and several vesicles.