Question

Arrange sequence from inner to outer surface of the ovum

a) Theca externa
b) Zona pellucida
c) Theca interna
d) Layer of granulosa cells
e) Primary oocyte

• A. e-b-d-c-a
• B. c-a-b-d-e
• C. a-d-e-b-c
• D. e-d-b-a-c

Answer 1

The correct option is A e-b-d-c-a

Primary oocyte is a result of the mitosis division of an oocyte, which is surrounded by a membrane known as Zona pellucida, which in turn is surrounded by multi-layered granulosa cells which secrete sex hormones. The granulosa cells, in turn, are enclosed in a thin layer of extracellular matrix or basal lamina. Outside the basal lamina, the layer Theca interna and Theca externa are found.

So, the correct answer is 'e-b-d-c-a'.