Question

Describe the organization of the brain and identify its embryological development and origins

A) The brain originates from the ectoderm and develops into three primary vesicles
B) Mesencephalon gives rise to the forebrain, which develops into the cerebral hemispheres
C) The brain develops from the endoderm, forming five distinct lobes
D) The neural tube becomes the spinal cord, while the brain develops from the mesoderm

Answer 1

The brain develops from the neural tube and gives rise to three primary vesicles. These vesicles differentiate further into five secondary vesicles, which form the major regions of the adult brain.

Step-by-step explanation:

The brain develops from the neural tube and gives rise to three primary vesicles: the forebrain, midbrain, and hindbrain. As the neural tube continues to grow, these vesicles differentiate further into five secondary vesicles, which correspond to the major regions of the adult brain. The telencephalon becomes the cerebrum, while the diencephalon becomes the thalamus and hypothalamus. The mesencephalon, metencephalon, and myelencephalon form the brain stem, and the cerebellum develops from the metencephalon as a separate region of the brain.