OCR A2 Biology 2.4.5 the Human brain

Notes for the spread 2.4.5 in the ocr a2 bio textbook.

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Emily summers
Cerebr
u m i
s t
he bi
ggest
area of
the
br
ain
and i
s di
vi
ded i
nto
two hemispheres,
connect
ed
by t
he corpus
call
osum. The out
er
l
ayer
has a
surf
ace
area of
2.
5m2
and i
s f
olded
but
consi
sts
of
a t
hin
layer
of
nerve
ce l
l
bodies
named t
he cer
ebral
cor
tex which
is
highl
y devel
oped,
more so
than
an y
other
organi
sm.
I
t
cont
rol
s:
Consci
ous t
hought
and emoti
onal
responses
Abi
li
ty
to
overr
ide
some ref
lexes
I
ntel
li
gence
such as
reasoni
ng and
judgement
Sensory areas Recei
ves i
mp ulses
indi
rect
ly
fr
om recept
ors
Association areas Comp ar
e i
np ut
wit
h pr
evious
experi
ences t
o
i
nter
pret
and j
udg e
an adequate
response
Motor areas Send i
mp ul
ses t
o eff
ector
s
muscl
e s/
glands
Non
consci
ous
oper
ati
on:
Sensor
y act
ivi
ti
es
e.g.
j
udging
posit
ion
of
object
s and
li
mbs
Feedback
inf
o on
muscle
posit
ion,
t
ension
and f
ine
mo vement
s
Cerebellum carries impulses to motor areas so motor output to effectors can
be adjusted. It processes sensory info from these areas:

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Emily summers
Reti
na
Bal
an ce
organs
in
inner
ear
Spi
nd l
e f
ibr
es i
n muscl
es
mu scl
e t
ensi
on
inf
o
J
o i
nts
Region of Brain Outline of Function
Medulla oblongata Contr
ols
non skel
etal
muscles
li
ke
car
diac
or
invol
untary
mu scl
es,
contr
ols
ANS ,
r
egulat
ory
cen t
res
for
vi
tal
pr
ocesses ar
e f
ou nd
here e.
g.…read more

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