Concept explainers
To review:
The parts of an adult brain that develop from the telencephalon and mesencephalon.
Introduction:
Brain is one of the major organs of an animal body made up of a large mass of nerve tissues, secured inside the skull. It is involved in various essential functions, such as controlling the blood pressure, heart and respiratory rate. It helps in the maintenance of the internal body environment by regulating the endocrine and nervous system.
Explanation of Solution
During the 4th week of development, the brain seems like a rostral part of the neural tube. The expansion and constriction of the brain begins in the 4th week of development. This results in the appearance of its three basic vesicles, namely rhombencephalon, prosencephalon, and mesencephalon. The caudal part of the neural tube develops as the spinal cord.
During the fifth week, five secondary vesicles develop from these three primary vesicles. The five secondary vesicles are telencephalon and diencephalon (from prosencephalon) myelencephalon, and metencephalon (from rhombencephalon). The mesencephalon remains undivided. The telencephalon gives rise to the cerebral hemispheres or cerebrum. The midbrain is formed by the mesencephalon.
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Chapter 13 Solutions
Human Anatomy
- Which of these parts of the embryonic brain is correctly matched withthe structure it becomes in the adult brain?a. mesencephalon—midbrainb. metencephalon—medulla oblongatac. myelencephalon—cerebrumd. telencephalon—pons and cerebellumarrow_forwardWhich brain lobe is located at the back of the brain, and what is one major function of this area? How does it differ from the hippocampus?arrow_forwardWhich two areas of the adult brain have an outside layer of gray matter in addition to central gray matter and surrounding white matter?arrow_forward
- What functions are served by the superior and inferior colliculi? To what portion of the brainstem do they belong?arrow_forwardWatch this animation (http://openstaxcollege.org/l/braindevel) to examine the development of the brain, starting with the neural tube. As the anterior end of the neural tube develops, it enlarges into the primary vesicles that establish the forebrain, midbrain, and hindbrain. Those structures continue to develop throughout the rest of embryonic development and into adolescence. They are the basis of the structure of the fully developed adult brain. How would you describe the difference in the relative sizes of the three regions of the brain when comparing the early (25th embryonic day) brain and the adult brain?arrow_forwardDescribe the five developmental regions of the brain, and identify the major areas of the adult brain that arise from each region.?arrow_forward
- Biology (MindTap Course List)BiologyISBN:9781337392938Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. BergPublisher:Cengage Learning