Organismal Development Part 3Male Animals

.MitochondrionIntermembrane spaceOuter membraneInner membraneCristaeMatrix100 nmMitochondrialDNAFreeribosomes in themitochondrialmatrix

Protogynous

GYN means female (think gynecologist)Limited number of males present

ProtoandrousANDRO refers to males Limited number of females present

External Fertilization

Phermones

Earthworms are hermaphrodites

Protogynous(Male is blue)

Internal Fertilization required

SpermatogenesisSpermatogoniumPrimary spermatocyte(in prophase of meiosis I)Mitotic division, producinglarge numbers of spermatogoniaMeiosis I completedDifferentiation and onset of meiosis ISecondary spermatocyteMeiosis IIEarlyspermatidsSpermatids(at two stages ofdifferentiation)DifferentiationSperm cellsNeckHeadMidpieceTailPlasma membraneMitochondriaAcrosomeNucleusSertoli cellnucleusLumen ofSeminiferous tubuleCross sectionof seminiferoustubuleTestisEpididymisSeminiferous tubule

Secondary Sexual Characteristics

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