Central Nervous System –Brain –Spinal cord Peripheral Nervous System –Autonomic N.S. –Somatic N.S. The Road Ahead
Divisions of the Brain 1. Cerebrum 2. Diencephalon 3. Midbrain 4. Cerebellum 5. Pons 6. Medulla Oblongata
Central Nervous System: The Brain Frontal Lobe Parietal Lobe Occipital Lobe Temporal Lobe
In General - our conscious mind enables us to: Functions of the Cerebrum Frontal Lobe - memory, behavior, personality, movement. Parietal Lobe - somatic sensory perception. Temporal Lobe - auditory and olfactory perception. Occipital Lobe - visual perception. Insula Lobe - visceral perception. Cerebrum has 5 Lobes Be aware of ourselves and sensations. Initiate and control voluntary movements.
Left Brain Functions Right Brain Functions Uses logic Detail oriented Facts rule Words and language Present and past Math and science Comprehension Knowing Acknowledges Order/pattern perception Knows object name Reality based Forms strategies Practical Safe Uses feeling “Big picture” oriented Imagination rules Symbols and images Present and future Philosophy and religion Gets the “meaning” Believes Appreciates Spatial perception Knows object function Fantasy based Presents possibilities Impetuous Risk taking
The Limbic System = “Emotional Brain” e.g., Cingulate gyrus Allows us to shift between thoughts. Interprets pain as unpleasant. e.g., Amygdala Detects menacing glances from others. Emotional recognition of faces.
1) Epithalamus Diencephalon = 1) Epithalamus, 2) Thalamus and 3) Hypothalamus Includes the pineal gland. Secretes hormones melatonin and serotonin under influence of the hypothalamus. * Dimethyl-tryptamine (DMT) also released from Pineal gland.
2) Thalamus * Makes up 80% of the diencephalon. * Act as the “gateway” to cerebral cortex.
3) Hypothalamus Main visceral control center of the body T b and Sexual Dimorphism Circadian rhythms Olfaction and Memory Sweating Shivering Heart Rate and BP Satiety Feeding Thirst and Hunger Posterior Pituitary Adrenal gland
Hypothalamus Major Functions include the following: 3. Regulation of sleep-wake cycles 1. Regulation of body temperature Control of behavior Control of emotional responses 5. Control of the endocrine system 4. Control of the autonomic nervous system and Limbic System 2. Regulation of hunger and thirst sensations
Functions of Cerebellum 1) Controls Postural Reflexes: 2) Produces Skilled Movements: - coordinates rapid, automatic adjustments of muscles in body to maintain equilibrium. - implements routines for fine tuned movements. Refines learned skills until action becomes routine.
The Brain Stem Midbrain, Pons, and Medulla Oblongata
Pons * Contains the pontine respiratory centers.
* Also contains the centers for hiccupping, sneezing, swallowing, vomiting and coughing Vital Centers in the MO include: 1. Cardiac Control Center 2. Vasomotor Center 3. Respiratory Center (Medullary) Medulla Oblongata
Neurons controlling breathing have µ receptors, to which opiates, like heroin bind. This accounts for suppressive effect of opiates on breathing. Images show decreased dopamine (D 2 ) receptors in the brain of a person addicted to cocaine (vs. non-drug user control). *Can result in changes to motivation and diminish sensitivity to natural rewards
Central Nervous System Peripheral Nervous System (Brain and Spinal Cord) (Nerves and Ganglia)
Peripheral Nervous System Somatic N.S.Autonomic N.S. Parasympathetic Division Sympathetic Division Skeletal Muscle Cardiac, Smooth Muscle and Glands