The document summarizes key aspects of the nervous system, brain, and behavior. It describes the central and peripheral nervous systems, including neurons, neurotransmitters, and the somatic and autonomic nervous systems. It then discusses three parts of the brain - hindbrain, midbrain, and forebrain - and their functions. The document also summarizes the endocrine system, hormones, and key glands like the pituitary, thyroid, and adrenals. It concludes by discussing the interplay between heredity and environment based on twin studies.

1. Chapter 6 Body and Behavior

2. Section 1 The Nervous System: The Basic Structure

12. Section 2 Studying the Brain

26. Section 3 The Endocrine System

34. Section 4 Heredity and Environment