Chapter 4

Chapter 4 - Chapter 4 The development of the brain, 3 weeks...

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Chapter 4 The development of the brain, 3 weeks after conception, when the neural plate folds up to form the neural tube. The bottom of the tube becomes the spinal cord. “Lumps” emerge at eh top of the tube and form the forebrain, midbrain and the hindbrain. Sometimes the neural tube fails to fully close and at the bottom of the tube the spinal cord is not fully encased and can lead to ancephaly, was the main portion of the brain above the brain stem fails to develop, or a portion of the brain protrudes from the skull. Chapter 5 The endocrine system affects various systems with the different glands that is the system and the different hormones that are produced from the gland. Pituitary gland produces the growth hormone and the activating hormones, which regulates from birth through adolescence, triggers adolescent growth spurs. Thyroid gland produces thyroxine, which signals other endocrine glands such as the ovaries and the testes to secrete their hormones. The testes produce testosterone which is responsible for development of the male reproductive system during the prenatal period; and directs male sexual development during adolescence. The ovaries produce estrogen and progesterone which is responsible from regulating the menstrual cycle; estrogen directs female sexual during adolescence. The adrenal glands produce adrenal androgens which play a supportive role in the development of muscle and bones; contribute to sexual motivation. *What is the relationship between brain development and risk taking? The prefrontal cortex, the region of the brain involved in control of emotions and decision making, decreases in size and undergoes a reorganization of neural connections during adolescence. The pre-frontal cortex appears to be important in planning and thinking decisions. Other research shows that in teenagers brain the area for desire for reward is less active and this may mean that they need more stimulus to achieve a level of desire for reward. *What is the later brain development? As you age you tend to lose some neuron functioning and you form senile plague, but it is possible for an older person to gain more neuron functioning as well as learn and remember new things. *What is the motor development of a infant in the first 2 years? Around 2 months they child can lift up head when lying on the stomach. At 3 months the child can roll over from stomach to back and hold head steady when being carried. At 4 months they can grasp a small object. At 5 months they can sit without support. At 6 months they can
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This note was uploaded on 04/13/2008 for the course PSY 3341 taught by Professor Michalski during the Spring '08 term at Baylor.

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Chapter 4 - Chapter 4 The development of the brain, 3 weeks...

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