How does Professor Greymatter describe the brain?
Grey matter (or gray matter) makes up the outermost layer of the brain and is pinkish grey in tone, hence the name grey matter. It gets its grey tone from the high concentration of neuronal cell bodies in contains. Grey matter also contains unmyelinated axons.
How would you describe the path of the reflex arc to a friend who doesn’t understand the concept?
How would you describe the path of the reflex arc to a friend who doesn’t understand the concept? A signal passes from the receptor through the spinal nerve and dorsal root into the spinal cord, where it is processed, and then a motor signal is sent from the spinal cord through the ventral root into a motor neuron.
What is spiral cord?
The spinal cord is a long, tube-like band of tissue. It connects your brain to your lower back. Your spinal cord carries nerve signals from your brain to your body and vice versa. These nerve signals help you feel sensations and move your body.
What is the wrinkled outer surface of the brain called?
The outer layer of the duplicate cerebral hemispheres is composed of a convoluted (wrinkled) outer layer of gray matter, called the cerebral cortex.
What is grey and white matter?
The gray matter is the areas where the actual “processing” is done whereas the white matter provides the communication between different gray matter areas and between the gray matter and the rest of the body. The neurons in the gray matter consist of neuronal cell bodies and their dendrites.
What do the grey and white matter in the brain represent?
The grey matter represents the high concentration of cell bodies of the neuron. The inner region of cerebrum is composed of white matter which is also called cerebral medulla. The white matter represents the high concentration of axons which gives it lighter appearance.
Which situation below is an example of a reflex action?
A few examples of reflex action are: When light acts as a stimulus, the pupil of the eye changes in size. Sudden jerky withdrawal of hand or leg when pricked by a pin. Coughing or sneezing, because of irritants in the nasal passages.
Why do we remove your hand quickly when we accidentally touch a hot plate?
The sensory neurons are at first activated that take information spinal cord/Brain . Information. Then, the motor neurons are activated and bring the brain impulses to the muscles. The muscles get contracted and we remove our hand immediately from the hot plate when these impulses are received.
What is cauda equina?
The cauda equina is the continuation of these nerve roots in the lumbar and sacral region. These nerves send and receive messages to and from the lower limbs and pelvic organs. Cauda equina syndrome (CES) occurs when there is dysfunction of multiple lumbar and sacral nerve roots of the cauda equina.
What forms the cauda equina?
The cauda equina is formed by the continuation of nerve fibers beyond the spinal cord. Compression of the cauda equina, such as by a herniated disc, may cause severe pain and numbness in both legs.
What is GREY matter?
Gray matter, named for its pinkish-gray color, is home to neural cell bodies, axon terminals, and dendrites, as well as all nerve synapses. This brain tissue is abundant in the cerebellum, cerebrum, and brain stem. It also forms a butterfly-shaped portion of the central spinal cord.
Do smarter brains have more wrinkles?
In fact, brain structure is a more reliable marker of smarts than brain size. On average, women have thicker cortices – the wrinkly, outer layer of the brain, responsible for higher-level functions – and thicker cortices have been associated with higher IQ scores.