PSY100H1 Chapter Notes - Chapter 2: Prenatal Development, Fetus, Axon Hillock

• School: UTSG
• Department: Psychology
• Course: PSY100H1
• Professor: Zachariah Campbell

Document Summary

Proper nutrition is crucial for the development of an intact cns. Many fetal difficulties like low birth weight and small head circumference can be cause by malnutrition. Increased stress leads to an increase in the amount of cortisol in the body. Becomes evident at 3 weeks of age; induced by signals from the mesoderm layer. The cells are totipotent aka able to become any cell in the body. The inside of the neural tube becomes the spinal canal and the cerebral ventricles. The neural crest develop into the neurons and glial cells. Induction begins when part of the ectoderm becomes the nervous system cells are totipotent aka stem cells. It is produced by the oligodendrocytes in the cns and schwann cells in the pns. 3: nodes of ranvier are the gaps in the myelin sheath that speed axonal conduction. They aid in transmission and allow the impulse to jump along the length of the axon.