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INSECT
REPRODUCTIVE
SYSTEM
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
Insect Reproductive System
gonad
Primary exit system
Secondary exit system
gonopore
Mesodermal
Ectodermal
Female Reproductive System
ovariole
lateral oviduct
common oviduct
vagina
accessory gland
spermathecal gland
spermatheca
ovary
calyx
Ovarioles
terminal filament
Germarium (2N)
Vitellarium (N)
Types of Ovarioles
Ovarioles1. Dieroistic2. Panoistic 3. Meroistic
a. Polytrophicb. Telotrophic (Acrotrophic)1. Dieroistic
common sac
primary oocyte
follicle cells
Lateral oviduct
Types of Ovarioles
Ovarioles1. Dieroistic2. Panoistic 3. Meroistic
a. Polytrophicb. Telotrophic (Acrotrophic)2. Panoistic
primary oocyte
follicle cells
germinal vesicle(nucleus)
peritoneal sheath
Types of Ovarioles
Ovarioles1. Dieroistic2. Panoistic 3. Meroistic
a. Polytrophicb. Telotrophic (Acrotrophic)2. Meroistic
a. Polytrophic
primary oocyte
follicle cells
germinal vesicle(nucleus)
peritoneal sheath
nurse cells
Types of Ovarioles
Ovarioles1. Dieroistic2. Panoistic 3. Meroistic
a. Polytrophicb. Telotrophic (Acrotrophic)2. Meroistic
a. Polytrophic
Types of Ovarioles
Ovarioles1. Dieroistic2. Panoistic 3. Meroistic
a. Polytrophicb. Telotrophic (Acrotrophic)2. Meroistic
b. Telotrophic
primary oocyte
follicle cells
germinal vesicle(nucleus)
peritoneal sheath
nurse cells
trophic cord
Male Reproductive System
testis
Ejaculatory duct
follicle
accessory gland
vas deferensseminal vesicle
Male Reproductive Systemapical
cell
Germarium
Zone of Growth
Zone of Maturation
Zone of Transformation
2N
N
Accessory gland products - Spermatophore
GametogenesisGametogenesis - all gametogenesis follows the same general sequence
Germ cell
Mitosis to produce more germ cells
2N
2N Primary gametocyte(meiosis I prophase)
N N
Complete meiosis I
Secondary gametocyte
N N N N
Meiosis II
Gamete
Onset of meiosis I
SpermatogenesisSpermatogonium
Mitosis to produce more germ cells
2N
2N Primary spermatocyte(meiosis I prophase)
N N
Complete meiosis I
Secondary spermatocyte
N N N N
Meiosis II
Early spermatids
Onset of meiosis I
Spermatozoa
Differentiation
Spermatogenesis
2N
2N
N N
N N N N
Germarium
Zone of Growth
Zone of Maturation
Zone of Transformation
Structure of Sperm – Mammalian model
acrosome
actin nucleus mitochondria
tail
Sperm types
ApyreneEupyrene
Sperm types
Oogenesis
Oogonium
Mitosis to produce more germ cells
2N
2N Primary oocyte(meiosis I prophase - arrested - present at birth)
N
Complete meiosis I
Secondary oocyte(arrested at metaphase of meiosis II)
N Ovum
Onset of meiosis I
Ovulation
First polar body
Second polar body
Germarium (2N)
Vitellarium (N)
Structure of ovariole
Vitellogenesis
Choriogenesis
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