Question

Corona radiata is derived from
A) Membrane granulosa
B) Cumulus ovaricus
C) Theca interna
D) Theca externa

Answer 1

The corona radiata, which exude out from the cortex and then move together in the brain stem, are the most common projection fibres. The projection fibres that comprise the corona radiata often radiate from the internal capsule out of the brain stem.

Complete answer:
First we should know about the corona radiata to answer this question. The corona radiata is a film of white matter that starts as the internal capsule ventrally and as the Centrum semiovale dorsally. The majority of the synaptic traffic to and from the cerebral cortex is borne by this layer of either ascending or descending axons. The corona radiata is connected to the corticopontine system, the corticospinal tract and the corticobulbar system.
Now, let us find the solution from the options-
- Membrane granulosa is a matrix of granulosa cells that form structures named primordial follicles which surround the primary oocytes. Thus, option A is not the correct option.
- The Cumulus ovaricus is a mass of cells in the Graafian follicle covering the oocyte and also after ovulation. Corona radiata, that is adjacent to the defensive layer of its ovum, is the inner layer of cumulus cells, the zona pellucida.
- The innermost layer of theca follicles is Theca interna. Thus option C is not the correct option.
- The outermost part of theca follicles is Theca externa. Thus, option D is not the correct option.

Thus, the correct answer is option (B) Cumulus ovaricus.

Note: Diseases that affect cerebral white matter, namely multiple sclerosis, ischaemic leukoencephalopathy, and progressive leukoencephalopathy, can influence corona radiata. This may have important impacts on social, intellectual, and emotional functioning.