Chemical messengers (neurotransmitters) bridge the gap Rats in an enriched environment will increase their synapses. 8 Synapse (Synaptic gap)
Enable communicatio n between neurons 9 Neurotransmitters
Neurotransmitters (similar to morphine) Reduces pain ◦ E.g. Childbirth 10 Endorphins
What do these parts do? 11 What are the parts of your nervous system?
Central nervous system ◦ Brain and spinal column Peripheral nervous system ◦ Links central nervous system (spinal cord) to sense receptors, muscles and glands 12 Nervous system
Brain and spinal column Severed spinal cord E.g. E.g. -Sally - knee jerk reaction without sensation of a tap on the knee ◦ Bill - No genital sensations, but has an erection when stimulated. 13 Central Nervous system
Sympathetic nervous system (Arousing) ◦ Increases heartbeat & blood pressure Parasympathetic nervous system (Calming) 14 Peripheral Nervous System
Brain stem Brainstem the oldest part of the brain, beginning where the spinal cord swells and enters the skull. Responsible for automatic survival functions.
Brain Stem Medulla [muh-DUL-uh] base of the brainstem, controls heartbeat and breathing. Reticular Formation a nerve network in the brainstem that plays an important role in controlling arousal.
Limbic system Between the brain stem and the Cerebral cortex Includes: Hippocampus ◦ Memory Amygdala ◦ Emotion Aggression & Fear Hypothalamus ◦ Hunger, thirst, temperature, & sex
Amygdala Amygdala [ah-MIG-dah-la] two almond-shaped neural clusters linked to emotion of fear and anger.
Hypothalamus Hypothalamus lies below (hypo) the thalamus; directs several maintenance activities like eating, drinking body temperature, and emotions. Helps govern the endocrine system via the pituitary gland.