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30 Cards in this Set
- Front
- Back
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ontogeny
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the study of development
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types of reproduction
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-oviparous: egg bearing
-viviparous: live birth |
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oviparous
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-egg bearing
-nutrition provided in egg -additional parental investment |
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types of viviparous
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-ovoviviparous: eggs within female
-euviviparous: true birth |
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ovoviviparous
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-eggs retained in female until birth
-lecitrophic: yolk feeding |
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euviviparous
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-additional nutrients from mother
-placental mammals |
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what is the advantage of viviparity
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-increase growth of the fetus
-fewer predation |
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microlecithal
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-small yolk
-marsupials, placentals, amphioxus |
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mesolecithal
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-medium yolk
-frogs, amphibians, some fish |
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macrolecithal
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-big yolk
-reptiles, monotremes, most fish |
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isolecithal
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yolk is evenly distributed
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telolecithal
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yolk is concentrated at one end
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animal pole
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area of the egg not concentrated with yolk
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vegetal pole
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area of the egg concentrated with yolk
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blastula
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hollow ball of cells
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gastrulation
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formation of gastrula
-gut/stomach |
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archenteron
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early gut
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neurolation
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formation of neural tube
-dorsal hollow nerve cord |
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neural plate
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thickening of dorsal ectoderm
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induction
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one tissue causes another to differentiate in a characteristic way
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spina bifida
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dorsal closure of neural tube is incomplete
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what are the four parts of the nervous system
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-prosencephelon
-mesencephelon -rhombencephelon -spinal cord |
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components within the forebrain
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-optic cup, turning into retina
-lens placoid, turning into lens |
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stomodeum
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mouth passageway
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proctodeum
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anus passageway
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Rathke's pouch
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adenohypophysis: edocrine part of pituitary
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ectodermal placodes
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sensory tissues
-olfactory -otic -lens |
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endoderm
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-forgut
-midgut -hindgut -lining of lungs, swim bladder, lining of auditory tract, glands |
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mesoderm
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dorsal mesoderm:
-myotomes-body wall -sclerotome-vertebral column and ribs -dermatome-skin lateral plate mesoderm: -somatic mesoderm- -splanchnic mesoderm- intermediate mesoderm: -kedney tubules -ducts of urogenital system |
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extraembryonic membranes
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-yolk sac-surrounds yolk
-amnion-contains fluid surrounding embryo -chorion-adjacent to egg shell or uterus -allantois-develops from posterior archenteron |
