The Brain Flashcards
Anthropods
First organisms with a central nervous system. about 520 million years ago.
Neanderthals
Lived about 350,000 to 28,000 years ago. Brain volume of 1,450 cc.
Australopithecus
4 million years ago. Brain volume 450-650 cc.
Home Erectus
1.6 million to 100,000 years ago. Brain volume of 900cc.
Home Sapiens
200,00 years ago to present. Brain volume of 1,300 cc.
Three Main Brain Structures
Hindbrain, Midbrain, Forebrain
Hindbrain
Regulates breathing, heart rate, arousal, and other basic survival functions.
The first brain function to develop
Three main parts of Hindbrain
Pons, Cerebellum, and Medulla
Medulla
A Hindbrain structure that extends directly from the spinal cord; regulates breathing, heart rate, and blood pressure. also involved in various kinds of involuntary reflective responses like coughing, sneezing, and vomiting.
Pons
A hindbrain structure that serves as a bridge between the lower brain regions and the higher midbrain. and forebrain activity.
Cerebellum
A hindbrain structure involved in body movement, balance, coordination, fine-tuning motor skills, and cognitive activities such as learning and language.
Midbrain
The second brain region to evolve after the hindbrain. It’s the smallest of the three regions. controls the eye muscles, process auditory and visual information and initiate voluntary movement of the body. The midbrain, the medulla, and the pons together are sometimes referred to as the brain stem.
Reticular formation
A network of nerve fibers that runs up through both the hindbrain and the midbrain; is crucial to waking up and falling asleep. It is considered a major player in the maintenance of wakefulness.
Giuseppe Moruzzi and Horace Magoun
They were the first neuroscientists to study the reticular formation.
Parkinson’s Disease and midbrain function
People with Parkinson’s disease have problems with midbrain function, due to the loss of neurons that use dopamine there.
Forebrain
The last major region to evolve. consists of the cerebrum and other structures, like the thalamus and the limbic system. Controls cognitive, sensory, and motor function, and regulate temperature, reproductive functions, eating, sleeping, and the display of emotions. The forebrain is bilateral- one on each side of the brain.
Thalamus (sensory relay station)
A forebrain structure that receives information from the senses and relays it to the cerebral cortex for processing.
Olfaction
The sense of smell.
unique in the case of the thalamus. It has a thalamic relay, but unlike other senses, it has direct connections to the memory and emotional processing areas of the brain in the limbic system.
The Limbic System
Controls motivation and emotion. it includes the hypothalamus, hippocampus, amygdala, and cingulate gyrus.
A connection group of forebrain structures (hypothalamus, amygdala, hippocampus, and cingulate gyrus) that share important information function in emotion, memory, and motivation and regulate autonomic and endocrine function.
Hypothalamus
A limbic structure; the master regulator of almost all major drives, and motives we have, such as hunger, thirst, temperature, and sexual behavior; also controls the pituitary gland.
Pituitary gland
Responsible for producing and controlling the hormones our bodies produce.
Hippocampus
A limbic structure that wraps itself around the thalamus; plays a vital role in learning and memory.
Amygdala
A small almond-shaped structure located directly in front of the hippocampus; has connections with many important brain regions and is important for processing emotional information, especially that related to fear.
Cingulate Gyrus
A belt-like structure in the middle of the brain; plays an important role in attention and cognitive control.
Basal ganglia
A collection of structures surrounding the thalamus; involved involuntary motor control.