|EMBRYOLOGY HOME||EMBRYOLOGY TABLE OF CONTENTS||OBL HOME||OBL REFERENCES|
In hemichordates and cephalochordates, the sperm consist of a head, a midpiece containing several mitochondria, and a flagellar tail (Benito, form Harrison 1997, p. 95 ). In urochordates and lancelets, intercellular bridges exist between spermatocytes during spermatogenesis, as in vertebrates (Burighel, from Harrison, 1997, p. 295) In lancelets, spermatocytes progress towards lumen as meiosis occurs and Sertoli cells exist (Ruppert, from Harrison, 1997, p. 491). In both lancelets and jawless fish, sperm are released into the coelom (as are ova).
|FROG SPERM PRODUCTION|
|CHICKEN SPERM PRODUCTION|
|RAT SPERM PRODUCTION|