PROFESSOR P.M. MOTTA, G. MACCHIARELLI, S.A NOTTOLA / SCIENCE PHOTO LIBRARY PROFESSOR P.M. MOTTA, G. MACCHIARELLI, S.A NOTTOLA / SCIENCE PHOTO LIBRARY
Secondary follicles in ovary. Coloured Scanning Electron Micrograph (SEM) of ovary tissue, showing two secondary follicles. A developing egg or secondary oocyte (yellow) is seen at the centre of one follicle. Follicles are surrounded by theca (violet) tissue which secretes steroids. Inside the theca are granulosa cells (blue) which nourish the developing egg. Between granulosa cells a space develops (at centre right, brown) called the follicular antrum, into which follicular fluid is secreted. Secondary follicles must develop into graafian follicles before the egg is fully mature. Magnification: x320 at 6x7cm size. Magnification: x400 at 4x5 inch size.
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