27
HUMAN ANATOMY
Nervous System
Hippocampus
(Memory)
Amygdala (Fear)
Hippocampus
Amygdala
PADMA MUDRA HAKINI MUDRA SHUNI MUDRA BUDDHI MUDRA
NEUROGENESIS
Scientists used to think that people are born with a certain number
of nerve cells and that they cannot grow new ones. Research has since
revealed that the growth of new neurons, or neurogenesis, can happen
at any age. Neurogenesis occurs in key areas of the brain responsible
for memory—the hippocampus—and smell. Neural stem cells in these
regions of the brain develop new neurons.
SITE FOR NEW CELLS
In this hippocampus tissue, helper
cells or neuroglia are blue, axons
are green, and neuron cell bodies
and stem cells are pink.
Stem cells
Hippocampal stem cells can
develop into new neurons,
improving memory
CORTISOL
LEVELS
Consistently high levels of
the stress hormone cortisol are
related to increased amygdala
(fear center, see p.25) activity
and decreased hippocampal
(memory center) activity.
When under these conditions,
the hippocampus doesnt grow
new neurons or connections
well. Yoga practices are shown
to reduce cortisol levels and
reverse these eects, which may
contribute to improving memory.
STRESS AND MEMORY
Increased activity in the amygdala
is correlated with reduced activity
in the hippocampus, which has an
adverse eect on memory.
Practice hand mudras
Hand mudras are gestures
that require concentration
and awareness. Just as
people who read braille
have more developed
hand-specic sensory areas
of their brain, mudras may
develop brain areas linked
with sensory acuity, and
ne motor skills.
US_026-027_Nervous_03.indd 27 28/09/2018 12:36
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