*210,21
Tough membranes called meninges
protect the frog's delicate brain and
spinal cord.
>S(11),216,211
*211,21
The spinal cord is housed inside the
frog's backbone.
>S(11),216,212
*212,21
The spinal cord and brain make up the
central nervous system.
>S(11),216,213
*213,21
The brain sends and receives messages
through the spine.
>B(10),216,0
>E(11),216,214
*214,21
Associated with its central nervous
system, the frog has sense organs and
special nerves.
>E(11),216,215
*215,21
Many of these connect to the spinal
cord, and so communicate with the brain.
>E(10),216,0
*216,31
The spinal cords of all vertebrates
share the same basic structure.
>S(01),0,217
*217,31
A frog's spinal cord ends almost halfway
down its back; a human spinal cord is
much longer.
>B(00),0,0
>E(01),0,218
*218,31
In frogs and humans, long nerves run
from the spine's base all the way to
the toes.
>E(01),0,219
*219,31
Some human nerves are as much as four
feet long!
>E(00),0,0
*1000