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MALE GAMETES
CNIDARIAN SPERM
CNIDARIAN SPERM
GRASSHOPPER SPERMATOGENESIS
GRASSHOPPER SPERM GRASSHOPPER SPERM

     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).

 

Amphioxus SPERM

Amphioxus SPERM Amphioxus SPERM
FROG SPERM PRODUCTION
FROG SPERM PRODUCTION FROG SPERM PRODUCTION
FROG SPERM PRODUCTION FROG SPERM PRODUCTION
CHICKEN SPERM PRODUCTION
CHICK SPERM PRODUCTION
CHICK SPERM PRODUCTION CHICK SPERM PRODUCTION
RAT SPERM PRODUCTION
RAT SPERM RAT SPERM
RAT SPERM RAT SPERM
BULL SPERM
BULL SPERM BULL SPERM
HUMAN SPERM
HUMAN SPERM HUMAN SPERM