Along with vision, hearing is one of the most important senses that humans have. We use it to communicate, learn, and stay aware of our environment. In fact, hearing is the only sense that never stops receiving sensory input. While all of our other senses become drastically less sensitive when we are sleeping, our brain still processes auditory information to awaken us the second something is wrong. Although this may have been more practically used before people slept safely in homes, it’s still
Introduction Humans have been considered the highest form of living things on earth . This is not attributed to the fact that the human body is strong or agile , because there are multiple animals that possess strength and agility far beyond the imagination of humans . The main characteristic that distinguishes humans from all other organisms is the brain . The brain is the powerhouse of the body . However this is also the site of the mind . The mind has been said to give humans superior status over
without a brain stem. A person 's heartbeat, blood pressure and breathings all originate from the brain stem. The parts of the brain that make up the brain stem are the mid brain, pons and the medulla. The mid brain, which is also known as the mesencephalon are comprised of the tegmentum and the tectum. These parts regulate body movement, vision and hearing. The pon 's portion of the brain stem is in the hind brain and it connects the cerebellum to assist with posture and other body movements.
1. Acetylcholine: A neurotransmitter that affects our muscle action, our memory, learning, REM (rapid eye movement), sleep, and our emotions. We see Acetylcholine being used when playing a sport. In the peripheral nervous system, Acetylcholine is the neurotransmitter that transmits signals between motor nerves and skeletal muscles. It acts at neuromuscular junctions and allows motor neurons to activate muscle action. For example, the brain might send out a signal to move the left arm. The signal
information to the cortex • Hypothalamus – master system for endocrine system and releases or inhibits hormones to be in charge of the pituitary gland • Third ventricle – a hollow space filled with cerebrospinal fluid; produces the cerebrospinal fluid Mesencephalon – concerned with vision, hearing and motor functions • Cerebral peduncles – makes of the front sides of the midbrain • Corpora quadrigemina - two groups of colliculi with white matter on the outside and gray matter on the inside • Mesencephalic
Neurotransmitters Neurotransmitters are chemicals made by neurons and used by them to transmit signals to the other neurons or non-neuronal cells (e.g., skeletal muscle; myocardium, pineal glandular cells) that they innervate. The neurotransmitters produce their effects by being released into synapses when their neuron of origin fires (i.e., becomes depolarized) and then attaching to receptors in the membrane of the post-synaptic cells. This causes changes in the fluxes of particular ions across
that are in charge of producing dopamine in the body start to slow down the dopamine making process and/or stop it all together. These dopamine producing cells can be found in a grouping of cells called the substantia nigra, which is found in the mesencephalon, also known as the midbrain. What dopamine does is it sends the electrical signals in the brain between the dopamine producing nerve cells from the substantia nigra to the corpus striatum (part of the forebrain). With the right flow of electrical