Axon

causing what we know as a twitch. A twitch is a contraction of the muscle due to only one action potential generated. Muscle nerves govern movements in a variation of ways. First is by recruitment, which simply means modifying the number of firing motor axons. Due to this definition,…

ENG 380T – Literature and Medicine Nicole Radova The Bionic Eye: A Collaborative Vision “Seeing is believing” – an idiom commonly uttered and heard in today’s Western world. Sight has been deemed the superior sense in our society since its association with knowledge acquisition in the eighteenth and nineteenth centuries (Classen 1997, 402), which the Scientific Revolution directly preceded. Yet available to us are four other senses, which itself is not an ultimate truth as the very concept…

as to a brain which consist of many neurons. Neurons are even shaped like trees. A tree starts with a seed which is like a soma for a neuron it’s located in the heart wood. The axon is the tree trunk which is covered by bark but in a neuron’s case it’s covered by a myelin sheath. The dendrites are the branches and the axon terminals bulbs are the tree stems. The same way all the parts play in how the tree works are the same in which all the parts of a neuron work. Electro-chemical impulses are…

The cerebellum, on the other hand, is involved in controlling movements through coordination, precision, and accurate timing of movement. Unlike the basal ganglia, it does not directly initiate or suppress movement but works by influencing movements by modifying activity patterns of the upper motor neurons. The cerebellum receives its input from the spinal cord in form of mossy fibers that project from the pons and spinocerebellar pathways. Mossy fibers contribute the information necessary for…

Estimating the speed of neural transmission from hand-ankle (treatment A) and hand-hand (treatment B) Introduction A neuron is a specialised cell transmitting nerve impulses and its function is to transmit information within the nervous system which is a network of nerve cells and fibres which transmit nerve impulses between parts of the body. Neural transmission occurs when a neuron is activated (sends out an electrical impulse). Activation of a neuron takes place when the neuron is stimulated…

sclerosis, the immune system does not perform its job, but instead, attacks the body resulting in varying levels of damage to the body. The effects of multiple sclerosis are seen as the result of occurrences taking place at a more molecular level. “If an axon loses myelin, it still lacks sodium channel in the areas previously covered with myelin, and most action potentials die out between one node and the next” (Kalat, p.44-45). Multiple sclerosis will present itself with a wide array of…

Nociception After the initial insult, peripheral nociceptors are activated by transduction through thin myelinated Aδ and unmyelinated C-fibers to the dorsal root group and into the posterior horn of the spinal cord. The axon bifurcates into two branches with one branch continuing to the CNS, the other innervating peripheral tissues. Action potentials are generated and the nociceptive signals initiate excitatory neurotransmitters such as glutamate and substance P, neuromodulators including…

Neuroeconomics: the neuroscience of decision making Neuroscience is a scientific field that studies brain activity though changes in brain blood flow. Neuroscience is the discipline in charge of studying through the nervous system activation that occurs in areas of the brain. The body receives information by its interaction with the world and that information gets through our senses, that information is caught from the nervous system and passes through the spinal cord until it arrives to the…

I am Thalamus according Scholapedia, am a small part of the brain located between in the middle and the center of the brain and I’m connected to the cerebral cortex and the midbrain thru nerves. I have many functions, but my main function is to regulate the voluntary motor control, the consciousness whether a person is asleep or awake (the sleep cycle), sight, sound, taste, and touch. I’m composed of 3 different groups of cells; the sensory relay cell or nuclei which receive sensation or…

According to the spinal cord injury zone (2005) “Paraplegia is the loss of sensation and movement in legs and in part or on the trunk, usually resulting from an injury to the spinal cord below the neck”. Paraplegia refers to loss of sensory and motor function in the thoracic, lumber or sacral segments of the spinal cord, secondary damage of neural elements within the spinal canal. Paraplegic function depends on the level of injury; the trunk, legs and pelvic organs may be involved (Steven et al.…