Reproductive System and Development

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Reproductive System and Development
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Figure 27.4A
Urinary bladder(excretorysystem)
Seminalvesicle(behindbladder)
Prostate gland
Bulbourethralgland
Urethra
Erectile tissueof penis
Scrotum
Vas deferens
Epididymis
Testis
Glans ofpenis
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Figure 27.4B
Rectum(digestivesystem)
Urinary bladder(excretory system)
Seminal vesicle
Vas deferens
Pubic bone(skeletal system)
Ejaculatoryduct
Prostate gland
Erectiletissue
Bulbourethral gland
Urethra(excretorysystem)
Anus(digestive system)
Penis
Vas deferens
Epididymis
Glans of penis
Testis
Testicle
Prepuce
Scrotum
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Figure 27.5A_1
Penis
Epididymis
Seminiferoustubule
Testis
Scrotum
Testis
Cross section ofseminiferous tubule
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Figure 27.5A
Penis
Epididymis
Seminiferoustubule
Testis
Scrotum
Testis
2n
Diploid cell
Differentiation andonset of meiosis I
2n
Primaryspermatocyte
Cross section ofseminiferous tubule
(diploid in prophaseof meiosis I)
Meiosis I completed
n
n
Secondaryspermatocyte
(haploid)
Meiosis II
n
n
n
n
Developingsperm cells
Differentiation
Sperm cells
n
n
n
n
(haploid)
Mature sperm released into center ofseminiferous
tubule
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Figure 27.4C
Sphinctercontracts
Urinarybladder
Urethral region hereexpands and fillswith semen
Contractionsof vas deferens
Contractionsof seminalvesicle
Contractionsof prostategland
Contractionsof epididymis
Sphinctercontracts
Sphincter remainscontracted
Semen expelled
Contractionsof musclesaround baseof penis
Contractionsof urethra
Sphincter relaxes
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Figure 27.4D
Stimuli from otherareas in the brain
Hypothalamus
Releasinghormone
Anteriorpituitary
Negative feedback
FSH
LH
Androgenproduction
Testis
Spermproduction
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Figure 27.3A
Oviduct
Ovaries
Follicles
Corpus luteum
Uterus
Wall of uterus
Endometrium(lining of uterus)
Cervix(neck of uterus)
Vagina
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Figure 27.3C
Oviduct
Ovary
Uterus
Rectum(digestive system)
Urinary bladder(excretory system)
Pubic bone(skeletal system)
Cervix
Urethra(excretory system)
Vagina
Shaft
Clitoris
Prepuce
Glans
Vulva
Labia minora
Labia majora
Anus(digestive system)
Vaginal opening
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Figure 27.5B_1
Beforebirth
Diploid cell
Ovary
Differentiationand onsetof meiosis I
Primaryoocytewithinfollicle
Primary oocyte
(arrested in prophaseof meiosis I presentat
birth)
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Figure 27.5B_2
Growingfollicle
Completion of meiosis Iand onset of meiosis II
Maturefollicle
Rupturedfollicle
Firstpolar body
Secondary oocyte
(arrested at metaphaseof meiosis II
releasedfrom ovary)
Ovulatedsecondary oocyte
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Figure 27.5B_3
Rupturedfollicle
Firstpolar body
Secondary oocyte
(arrested at metaphaseof meiosis II
releasedfrom ovary)
Ovulatedsecondary oocyte
Entry of sperm triggerscompletion of meiosis II
Secondpolar body
Corpus luteum
Mature egg(ovum)
Degeneratingcorpus luteum
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Figure 27.9C
A sperm touchesthe eggs jellycoat, and its
acrosomereleases enzymemolecules.
The spermsacrosomalenzymes digest theeggs
jelly coat.
Proteins on thesperm head bindto egg receptors.
The plasma membranesof sperm and egg fuse.
Acrosomalenzymes
The sperm nucleus entersthe egg cytoplasm.
Plasma membrane
The vitellinelayer separatesand
becomesimpenetrable.
Sperm
Nucleus
Acrosome
Receptor proteinmolecules
Plasmamembrane
Spermnucleus
n
Vitellinelayer
Cytoplasm
n
The nuclei of spermand egg fuse.
n
Jellycoat
Eggnucleus
n
Egg cell
2n
Zygote nucleus
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Figure 27.10_s1
Zygote
2 cells
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Figure 27.10_s2
Zygote
2 cells
4 cells
8 cells
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Figure 27.10_s3
Zygote
2 cells
4 cells
8 cells
Many cells (solid ball)
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Figure 27.10_s4
Zygote
2 cells
4 cells
8 cells
Many cells (solid ball)
Blastocoel
Blastula(hollow ball)
Cross sectionof blastula
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Table 27.11
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