Abstract
Fine structural changes have been observed in spermatids of the ostracod Cypridopsis sp. During spermiogenesis the nucleus undergoes elongation and segregation into an inner and an outer compartment; two mitochondria become spirally aligned along three-fourths the length of mature spermatozoa; and the nuclear membrane, endoplasmic reticulum, and Golgi complex give rise to morphologically unique, bilaterally situated, membranous organelles. Early spermatids contain abundant amounts of granular endoplasmic reticulum. Portions of the endoplasmic reticulum are found in later spermatids as paired elements on alternate sides of the elongating nucleus and mitochondria. Such paired elements of endoplasmic reticulum are continuous with the outer leaflet of the nuclear membrane. The endoplasmic reticulum and nuclear membrane elaborate two bilaterally situated membranous organelles which extend three-fourths the length of mature spermatozoa. Vesicles from the Golgi complex align in repeat order along the full extent of the membranous organelle. Mature spermatozoa are 1.0 mm long, filiform, spirally patterned cells. The possible functional significance of the fine structure observed in this spermatozoon is discussed in terms of what is known about organelles found in more typical filiform spermatozoa.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call