... damaged, the distal segment undergoes Wallerian degeneration, losing its myelin sheath. The proximal
segment can either die by apoptosis or undergo the chromatolytic reaction, which is an attempt at
In PNS axonal sprouts form at the proximal stump and grow until they enter the distal stump. ...
Fact sheet (PDF, 63.03 KB) (opens in a new window)
... Nervous injury, from trauma, disease or
otherwise, is a major medical problem.
Mature neurons do not undergo cell division
and therefore it is very difficult to achieve
successful rehabilitation after nerve injuries.
It is known, however, that where the injury
causes gaps in axons, it is possible fo ...
Peripheral Nerve Repair
... transmit signal down the axon, within the
• Neurotransmitters (Chemical signaling)
through vesicle transport are used to send
signals between nerves.
•Bundles and series of neurons make a
•The less neurons the better
•Some nerve cells are over 1.5m long
Nervous System Worksheet
... A. Nerves of the eyes that allow us to see what is above, below and to the sides of a
focused object (peripheral vision).
B. The collective name for nerve tissue outside of the central nervous system (brain and
C. The nerves of the fingers, toes, nose-tip and other areas around the per ...
THE NERVOUS SYSTEM: Communication
... THE NERVOUS SYSTEM: Communication system of the body
A. The nervous system is divided into two parts:
1. Central Nervous System (CNS) – brain and spinal cord
2. Peripheral Nervous System (PNS) – peripheral nerves through the body
- includes 31 pairs of spinal nerves
- includes 12 pairs of cranial ne ...
Co-ordination - BIFS IGCSE SCIENCE
... This provides constant input (stimuli) from
our environment. It is designed to detect
changes that will increase an organisms
chances of survival.
We have 5 senses or sensations we can
detect. Cells or organs that detect these are
Nerve Tissue Notes
... Nerve Cell – The Neuron
• Axon sends impulses
– Myelin sheath, made of Schwann cells, wraps
around axons and speeds up signals
... 9. processing and interpreting sensory input and making decisions about
what should be done
10. nerve endings which are sensitive and respond to light energy
11. stimulus strength strong enough to cause a response
12. when one pre-synaptic neuron affects a response in two post-synaptic
13. o ...
Slide () - FA Davis PT Collection
... Spinal nerves of the peripheral nervous system are connected to the spinal cord by anterior roots (sensory neurons) and posterior roots (motor neurons)
within the intervertebral foramen. On exiting the spinal column, the spinal nerve splits into dorsal and ventral rami. Dorsal rami typically innerva ...
The Nervous System
... • Allows body to respond to stimuli
• 1. Central Nervous System:
• - brain
• - spinal cord
• 2. Peripheral Nervous System
- nerves leading away from cns
... The control centre of the body. It is an
organ in the skull made from nerve cells.
It receives messages from all parts of
the body and sends out messages in
A long rod made of many nerves attached
to the base of the brain and running down
almost to the end of the spinal column.
Nerves from t ...
Nerve Pathways Practice Sheet
The nervous system is a connection of many different (1) _____________________ (nerve cells).
These nerves form pathways that send messages all over the body, in many different directions. (2) ________
neurons detect specific kinds of environmental stimuli, (3) ___________________ ...
Neurons, nerves and glia
... the brain and the spinal cord
Motor nerves – carry impulses from
the CNS to organs
Mixed nerves – contain both sensory
and motor fibers
Nervous System 4/28/09
... 2. Responding to info – reaction to
3. Maintaining homeostasis
EQ2.3 - nerve cells communicate-
... If it weren’t for nerve cells we wouldn’t be able to understand our thoughts, motor and
emotional responses, learning and memory skills. Nerve cells or neurons constantly gather
information from the inside of our organism and its external environment. Thus evaluating the
activities required to a per ...
Nervous Dia rams
... 3. The connection between adjacent neurons.
4. The chemical secreted into the gap
between neurons at a synapse.
nervous system worksheet
... ..................................... 10. The sense organ or cells that receive stimuli from within and outside the body.
..................................... 11. The reaction to a stimulus by a muscle or gland.
..................................... 12.The part of the nerve cell containing the nucl ...
Neuroregeneration refers to the regrowth or repair of nervous tissues, cells or cell products. Such mechanisms may include generation of new neurons, glia, axons, myelin, or synapses. Neuroregeneration differs between the peripheral nervous system (PNS) and the central nervous system (CNS) by the functional mechanisms and especially the extent and speed. When an axon is damaged, the distal segment undergoes Wallerian degeneration, losing its myelin sheath. The proximal segment can either die by apoptosis or undergo the chromatolytic reaction, which is an attempt at repair. In the CNS, synaptic stripping occurs as glial foot processes invade the dead synapse.Nervous system injuries affect over 90,000 people every year. It is estimated that spinal cord injuries alone affect 10,000 each year. As a result of this high incidence of neurological injuries, nerve regeneration and repair, a subfield of neural tissue engineering, is becoming a rapidly growing field dedicated to the discovery of new ways to recover nerve functionality after injury. The nervous system is divided into two parts: the central nervous system, which consists of the brain and spinal cord, and the peripheral nervous system, which consists of cranial and spinal nerves along with their associated ganglia. While the peripheral nervous system has an intrinsic ability for repair and regeneration, the central nervous system is, for the most part, incapable of self-repair and regeneration. There is currently no treatment for recovering human nerve function after injury to the central nervous system. In addition, multiple attempts at nerve re-growth across the PNS-CNS transition have not been successful. There is simply not enough knowledge about regeneration in the central nervous system. In addition, although the peripheral nervous system has the capability for regeneration, much research still needs to be done to optimize the environment for maximum regrowth potential. Neuroregeneration is important clinically, as it is part of the pathogenesis of many diseases, including multiple sclerosis.