Answer: A neuron consists of a cell body with a nucleus and cytoplasm from which longs, thin hair-like parts arise. Each neuron has a single long part, called the axon and many short, branched parts called dendrites.

The human brain color physically appears to be white, black, and red-pinkish while it is alive and pulsating. Images of pink brains are relative to its actual state. The brains we see in movies are detached from the blood and oxygen flow result to exhibit white, gray, or have a yellow shadow.

Summary: Being green is a lifestyle. In just a thousandth of a second, a neuron can dump up to 5,000 molecules of its chemical messenger – a neurotransmitter – into the synapse, where it will trigger an impulse in a neighboring nerve cell. …

A typical neuron is divided into three parts: the cell body, the dendrites and the axon. The cell body (green color), the center of the neuron, extends its processes called the axon and the dendrites to other cells. Dendrites typically branch profusely, getting thinner with each branching (blue color).

Researchers have found the presence of neurons in the human brain which can each selectively respond to an intermediate color; not just neurons of red, green, yellow and blue. In this format, orange can be represented as the combination of red and yellow, and purple as a combination of blue and red.

The synapse is a very small space between two neurons and is an important site where communication between neurons occurs. Once neurotransmitters are released into the synapse, they travel across the small space and bind with corresponding receptors on the dendrite of an adjacent neuron.

The gap between two neurons called synapse, helps in quick transmission of impulses from one neuron to another. Always one-way communication i.e. unidirectional, transmitting from pre-synaptic to post-synaptic neurons. Can be used to calsculate timing of sensory inputs. Greater plasticity.

The physical gap or space present between two neurons is called the synaptic cleft.

Nodes of Ranvier lie between neurons. The space between neurons is called the neuronal space. In convergence, two or more incoming fibers contact a single neuron, whereas in divergence, impulses leaving a neuron pass into several output fibers.

Multipolar neurons are the most common neuron in the vertebrate nervous system and their structure most closely matches that of the model neuron: a cell body from which emerges a single long axon as well as a crown of many shorter branching dendrites.

Neurons, also known as nerve cells, send and receive signals from your brain. While neurons have a lot in common with other types of cells, they’re structurally and functionally unique. Specialized projections called axons allow neurons to transmit electrical and chemical signals to other cells.

neurons

The peripheral nervous system carries messages to and from the central nervous system. It sends information to the brain and carries out orders from the brain. Messages travel through the cranial nerves, those which branch out from the brain and go to many places in the head such as the ears, eyes and face.

The impulse travels through the cell body and is carried through the axon to the end brush, a collection of fibers that extend off the axon. Here, the impulse triggers a release of chemicals that allow the impulse to travel through the synapse—the space between the axon of one neuron and the dendrites of the next.

The thalamus carries messages from the sensory organs like the eyes, ears, nose, and fingers to the cortex.

In the human context, the signals carried by the large-diameter, myelinated neurons that link the spinal cord to the muscles can travel at speeds ranging from 70-120 meters per second (m/s) (156-270 miles per hour[mph]), while signals traveling along the same paths carried by the small-diameter, unmyelinated fibers of …

frontal lobe

Central nervous system

In biology, a reflex, or reflex action, is an involuntary, unplanned sequence or action and nearly instantaneous movement in response to a stimulus….Reflexes involving cranial nerves.

Reflexes can be altered by impulses from higher levels of the central nervous system. For example, the cough reflex can be suppressed easily, and even the gag reflex (the movements of incipient vomiting resulting from mechanical stimulation of the wall of the pharynx) can be suppressed with training.

• Categories of Reflexes. Reflexes can either be visceral or somatic.
• Stretch Reflex. One of the simplest reflexes is a stretch reflex.
• Flexor (Withdrawal) Reflex. Recall from the beginning of this unit that when you touch a hot stove, you reflexively pull your hand away.
• Crossed-Extensor Reflex.

Health Library: Pediatrics

• Root Reflex. This reflex begins when the corner of the baby’s mouth is stroked or touched.
• Suck Reflex. Rooting helps the baby become ready to suck.
• Tonic Neck Reflex.
• Moro Reflex.
• Grasp Reflex.
• Babinski Reflex.
• Step Reflex.

Seven top tips to improve your reflexes

1. Pick a sport, any sport – and practise. What exactly do you want to improve your reflexes for?
2. Chill out.
3. Eat a lot of spinach and eggs.
4. Play more video games (no, really)
5. Use your loose change.
6. Playing ball.
7. Make sure you get enough sleep.

The response to the tap of the rubber hammer is called a knee-jerk reflex, but scientists and doctors call it a monosynaptic reflex—the simplest reflex that occurs inside your body [2]. You may be wondering why it’s called monosynaptic because knee-jerk is easier to remember and spell.

Reflexes do not require involvement of the brain, although in some cases the brain can prevent reflex action. Reflex arc: The path taken by the nerve impulses in a reflex is called a reflex arc.

Reflexes protect your body from things that can harm it. For example, if you put your hand on a hot stove, a reflex causes you to immediately remove your hand before a “Hey, this is hot!” message even gets to your brain.

In reaction these muscles contract, and the contraction tends to straighten the leg in a kicking motion. Exaggeration or absence of the reaction suggests that there may be damage to the central nervous system. The knee jerk can also be helpful in recognizing thyroid disease.