The Human Brain During the Third Trimester

Hypo-

thalamus

Hypo-

thalamus

ThalamusThalamus

SeptumSeptum

T

ect

u

m

T

ect

u

m

T

egmentu

m

T

egmentu

m

PONSPONS

MEDULLAMEDULLA

Spinal

cord

Spinal

cord

Cerebellar

vermis

Cere bellar

vermis

M

I

D

B

R

A

IN

M

I

D

B

R

A

IN

DIEN-

CEPHALON

DIEN-

CEPHALON

T E M P O R

AL

LOBE

(

F

R

O

N

T

A

L

L

O

B

E

)

(PA

RAC

ENTR

ALLOBULE)

O

C

C

I

P I T A L L O B E

PA

R

IE

T

A L L O B E

GenuGenu

S

p

le

n

iu

m

S

p

le

n

iu

m

Cere bellar

hemisphere

(P(Prrecuneusecuneus))

(Cuneus(Cuneus))

(Lingula)(Lingula)

Subcallosal

area

Subcallosal

area

(Gyrus (Gyrus rrectus)ectus)

C

or

pu

sca

llosu

m

C

or

pu

sca

llosu

m

FFoorrnniixx

C

in

gu

lat

eg

yru

s

C

in

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lat

eg

yru

s

P

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r

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to

• o

cc

ip

it

a

l

su

lc

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s

P

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ip

it

a

l

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lc

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s

Calc

ar

in

e

su

lc

us

Calc

ar

in

e

su

lc

us

C

ing

ula

tes

ulc

us

C

ing

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tes

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et

ro

sp

le

n

ia

l

a

r

e

a

)

(R

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)

(S

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p

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io

r

fr

o

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ru

s)

(S

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p

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fr

o

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s)

Marginal

sulcus

Marginal

sulcus

Figure 11. Midline sagittal view of a GW25 brain with major structures in the cerebral hemispheres and brainstem labeled. (This is part of Figure 2-9 on

page 27 in B. A. Curtis, S. Jacobson, and E. M. Marcus (1972) An Introduction to the Neurosciences, Philadelphia: W. B. Saunders. The photograph was

originally published by J. C. Larroche (1966) The development of the central nervous system during intrauterine life. In: Human Development, F. Falkner

(ed.), Philadelphia: W. B. Saunders, page 259.)