What is the secondary follicle characterised by?

Step-by-step solution

The secondary follicle soon transforms into a tertiary follicle which is characterized by a fluid filled cavity called antrum . The theca layer is organized into an inner theca interna and an outer theca externa. It is important to draw your attention that it is at this stage that the primary oocyte within the tertiary follicle grows in size and completes its first meiotic division. It is an unequal division resulting in the formation of a large haploid secondary oocyte and a tiny first polar body. The secondary oo