Interesting About brain....

1. How long does the brainstay
active after death? What happens
to all the memories?
BY..........KHUSH
BS CARDIOLOGY
KHYBERMEDICALUNIVERsity

2. ANSWERED
• Firstly, a person is not declared until and unless there are
no brian waves. Now coming to the question, the brain can
survive for up to about six minutes after the heart stops.
The reason to learn CPR is that if it is started within six
minutes of cardiac arrest, the brain may survive the lack of
oxygen. After about six minutes without CPR, however, the
brain begins to die.

3. CONTI......
• Lets talk about the memory part,
• Well there are multiple levels of memory, some of
which would die immediately, some of which would
take some time. So the answer is: it depends; some
immediately, some only very slowly.

4. CONTI......
• At the highest level, the current neuronal firing state of the brain
encodes memory on a very short scale - working memory. The
memory held on this level does not have a clear anatomical
counterpart. It equals very short-term memory/STM sequences,
such as the words you read just before you read the words you're
reading right now. This memory is lost immediately when you
lose consciousness, at least to some degree; as this memory is
hard to even strictly distinguish from consciousness and
attention.

5. CONTI......
• Other forms of short-term memory/STM are stored in a
slightly different form: short-term potentation, the adaption
of neuronal responses following brief and intense stimulation.
Spike Frequency Adaption/SFA is at an intermediate stage
between this and the previous level. Short-term potentation
and SFA decay within minutes or even seconds if they are not
transferred into some more durable form of memory.

6. CONTI......
• Long-term memory (/LTM) stores have specific anatomical correlates;
they are stored in, amongst others, the synaptic weights (i.e. the amount
of influence the firing of one neuron has on another). Some forms of LTM
are best located in cortical synapses, others in the hippocampus. An even
more fundamental, long-term, durable storage form is the wiring itself;
not just the weights, but the existence of a synapse between two points, or
not
• These can be considered a form of memory that will remain intact for the
longer time period.

7. CONTI......
• However, the more direct answer to the
question s that once a large amount of neurons
have died (brain death), there is currently no
way one can access a non-trivial amount of
memory. As long as this is averted, nontrivial
amounts of memory can be recovered.

8. •THANK YOU
• F***