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6.2 The Brain (cont.) Human brain weighs 1,350 grams (3 pounds) Has consistency of Jell-O.

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Presentation on theme: "6.2 The Brain (cont.) Human brain weighs 1,350 grams (3 pounds) Has consistency of Jell-O."— Presentation transcript:

1 6.2 The Brain (cont.) Human brain weighs 1,350 grams (3 pounds) Has consistency of Jell-O

2 Major Parts of the Brain 1. Forebrain Largest part of the brain Refers to the right and left hemispheres – Responsible for infinite number of functions Covered by a thin layer of cells called the CORTEX (which is then divided into the 4 lobes of the brain

3 Limbic System Includes ½ dozen interconnected structures that make up the core of the forebrain Involved in motivational behaviors such as obtaining food, sex; emotions like fear, anger, aggression; storing of memories

4 Limbic System Hypothalamus: hunger, thirst, sex, fight or flight, hormone secretion Thalamus: receives sensory info, processes then relays info to cortexes Amygdala: forms, recognizing, and remembering emotional experiences and facial expressions Hippocampus: saves many kinds of fleeting memories

5 Major Parts of the Brain 2. Midbrain Centered underneath the two hemispheres of the Forebrain Involved in visual and auditory reflexes Reticular formation (RF) extends from Midbrain to spinal cord, and it alerts/arouses the forebrain for incoming info from the senses

6 Major Parts of the Brain 3. Hindbrain: Its structures and functions are in the most primitive of brains and have remained unchanged over evolutionary time

7 3. Hindbrain: structures – Pons: bridge between spinal cord and brain; makes sleep chemicals – Medulla: at top of spinal cord; controls vital reflexes---heart rate, breathing, etc – Cerebellum: at very back and underneath the brain; coordinates movements, timed motor responses


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