The metencephalon (metЈ-en-SEF-a-lon met- ϭ after) becomes the pons, cerebellum, and upper part of the fourth ventricle.The mesencephalon (mesЈ-en-SEF-a-lon (mes- ϭ middle)), or midbrain, gives rise to the midbrain and aqueduct of the midbrain (cerebral aqueduct).
The diencephalon (dı¯Ј-en-SEF-a-lon) forms the thalamus, hypothalamus, epithalamus, and third ventricle. The telencephalon (telЈ-en-SEF-a-lon tel- ϭ distant -encephalon ϭ brain) develops into the cerebrum and lateral ventricles. Describe the blood supply of the brain In order to understand the terminology used for the principal parts of the adult brain, it will be helpful to know how the brain develops The brain and spinal cord develop from the ectodermal neural tube (see Figure 14.27) The anterior part of the neural tube expands, along with the associated neural crest tissue Constrictions in this expanded tube soon appear, creating three regions called primary brain vesicles: prosencephalon, mesencephalon, and rhombencephalon (see Figure 14.28) Both the prosencephalon and rhombencephalon subdivide further, forming secondary brain vesicles The prosencephalon (PROSen-sefЈ-a-lon), or forebrain, gives rise to the telencephalon and diencephalon, and the rhombencephalon (ROM-ben-sefЈ-a-lon), or hindbrain, develops into the metencephalon and myelencephalon The various brain vesicles give rise to the following adult structures:. THE BRAIN AND CRANIAL NERVES 14.1 Brain Organization, Protection, and Blood Supply OBJECTIVES. The Brain and Cranial Nerves The brain, cranial nerves, and homeostasis Your brain contributes to homeostasis by receiving sensory input, integrating new and stored information, making decisions, and executing responses through motor activities Solving an equation, feeling hungry, laughing-the neural processes needed for each of these activities occur in different regions of the brain, that portion of the central nervous system contained within the cranium About 85 billion neurons and 10 trillion to 50 trillion neuroglia make up the brain, which has a mass of about 1300 g (almost lb) in adults On average, each neuron forms 1000 synapses with other neurons Thus, the total number of synapses, about a thousand trillion or 1015, is larger than the number of stars in our galaxy The brain center for registering sensations, correlating them with braiin is the control c one on ne another and with stored information, making decisions, and taking actions It also is the center for the intellect, emotions, behavior, and memory But the brain encompasses yet a larger domain: It directs mem our behavior toward others With ideas that excite, artistry that dazzles, or rhetoric that mesmerizes, one person’s thoughts d and a actions may influence and shape the lives of many others As you will see shortly, different regions of the brain are specialized for different functions Different parts of the brain aalso work together to accomplish certain shared functions This chapter explores how the brain is protected and nourished, what c functions occur in the major regions of the brain, and how the fu spinal cord and the 12 pairs of cranial nerves connect with the spin brain to form the control center of the human body Dr P M Did you ever wonder how cerebrovascular accidents (strokes) occur and how they are treated 473 araz zi/ Sc i en ce S ou rc e 474 CHAPTER 14 
(BQ) Part 2 book Principles of anatomy and physiology presents the following contents: The brain and cranial nerves, the autonomic nervous system, the special senses, the endocrine system, the lymphatic system and immunity, the respiratory system, the digestive system, metabolism and nutrition, the urinary system, the reproductive systems.
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