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INSECT REPRODUCTIVE SYSTEM
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Reproductive system (1) of mixed embryonic origin - ecto- & mesoderm
(2) only functional in adult (3) not required for survival of individual (4) contributes directly to next generation
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Insect Reproductive System
gonad Primary exit system Mesodermal Secondary exit system Ectodermal gonopore
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Female Reproductive System
ovary ovariole calyx lateral oviduct common oviduct spermathecal gland spermatheca accessory gland vagina
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Ovarioles terminal filament Germarium (2N) Vitellarium (N)
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Types of Ovarioles 1. Dieroistic common sac primary oocyte
Panoistic Meroistic a. Polytrophic Telotrophic (Acrotrophic) Types of Ovarioles 1. Dieroistic common sac primary oocyte follicle cells Lateral oviduct
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Types of Ovarioles 2. Panoistic primary oocyte peritoneal sheath
Dieroistic Panoistic Meroistic a. Polytrophic Telotrophic (Acrotrophic) Types of Ovarioles 2. Panoistic primary oocyte peritoneal sheath germinal vesicle (nucleus) follicle cells
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Types of Ovarioles 2. Meroistic a. Polytrophic primary oocyte
Dieroistic Panoistic Meroistic a. Polytrophic Telotrophic (Acrotrophic) Types of Ovarioles 2. Meroistic a. Polytrophic primary oocyte nurse cells peritoneal sheath germinal vesicle (nucleus) follicle cells
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Types of Ovarioles 2. Meroistic a. Polytrophic Ovarioles Dieroistic
Panoistic Meroistic a. Polytrophic Telotrophic (Acrotrophic) Types of Ovarioles 2. Meroistic a. Polytrophic
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Types of Ovarioles 2. Meroistic b. Telotrophic nurse cells
Dieroistic Panoistic Meroistic a. Polytrophic b. Telotrophic (Acrotrophic) Types of Ovarioles 2. Meroistic b. Telotrophic nurse cells trophic cord primary oocyte peritoneal sheath germinal vesicle (nucleus) follicle cells
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Male Reproductive System
testis follicle seminal vesicle vas deferens accessory gland Ejaculatory duct
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Male Reproductive System
apical cell 2N Germarium Zone of Growth N Zone of Maturation Zone of Transformation
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Accessory gland products - Spermatophore
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Gametogenesis Gametogenesis - all gametogenesis follows the same general sequence Germ cell 2N Mitosis to produce more germ cells Onset of meiosis I Primary gametocyte (meiosis I prophase) 2N Complete meiosis I N N Secondary gametocyte Meiosis II Gamete N N N N
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Spermatogenesis Spermatogonium Mitosis to produce more germ cells
Onset of meiosis I Primary spermatocyte (meiosis I prophase) 2N Complete meiosis I N N Secondary spermatocyte Meiosis II N N N N Early spermatids Differentiation Spermatozoa
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Spermatogenesis Germarium Zone of Growth Zone of Maturation
Zone of Transformation N N N N
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Structure of Sperm – Mammalian model
nucleus actin mitochondria acrosome tail
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Sperm types Apyrene Eupyrene
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Oogenesis Ovum Oogonium Mitosis to produce more germ cells
Onset of meiosis I Primary oocyte (meiosis I prophase - arrested - present at birth) 2N Complete meiosis I First polar body N Secondary oocyte (arrested at metaphase of meiosis II) Ovulation Ovum Second polar body N
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Structure of ovariole Germarium (2N) Vitellogenesis Vitellarium (N) Choriogenesis
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