How did the forebrain, midbrain, and hindbrain change over the course of evolution? Be specific. You...

How did the forebrain, midbrain, and hindbrain change over the course of evolution? Be specific. You must tell me how the three-part brain evolved into a 5-part brain (which is a hint in and of itself). What are two functions of each?

Expert Solution

At 4th week, cephalic end of the neural tube develops 3 dilations. These are called primary brain vesicles. Craniocaudally these are prosencephalon (forebrain), mesencephalon (midbrain), rhombencephalon (hindbrain). When embryo is 5 weeks old, prosencephalon develop 2 parts - telencephalon (consisting of the 2 primitive cerebral hemispheres with a mid portion) and diencephalon (later develop into metathalamus, thalamus, hypothalamus and epithalamus, subthalamus). The telencephalon covers the diencephalon. The rhombencephalon also develops 2 parts - metencephalon (later develop into pons and cerebellum) and myelencephalon( develops into medulla oblongata . Thus there are 5 secondary brain vesicles.

gladiator answered 1 year ago

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