Production of nutrients - Production of nutrients...

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Production of nutrients – vitellogenesis - Two generalized gonad types (ovaries) o Diffuse (sponges) – not included 1. Solitary gonads – oocyte receives nutrients from maternal fluids with no helper cells (nurse or follicle cells) – echinoderms? 2. Alimentary gonads – oocyte relies of follicle/nurse cells; what we mainly focus on o Follicular – follicle cells, transport by gap junctions or pinocytosis, modified in oocyte (amphibians – when it is making all of its nutrient components, it relies on an extra oocytic source for vitellogenesis, which is the liver. The liver is probably important in a lot of animals, including mammals.) o Nutrimentary – relies on nurse cells, follicle cells are also present, no lampbrush chromosomes, no supernumerary nucleoli, polytene chromosomes in nurse cells, also termed a meroistic ovary (characteristic in insects) Merioistic ovaries - Typical of insects and annelids - Start with a single, dividing cystoblast – divides a number of times to produce 16 cells. Of these cells, 2 cells will have 4 intercytoplasmic bridges.
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