Question

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ure of the
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Spinal Cord
12 The spinal cord is the continuation of the medulla
oblongata. On the basis of the indicators, analyse
illustration 1.8 and the description and prepare notes
The spinal cord of a new born
baby extends upto the tip of
in
your Science diary.
the vertebral column. Batin
The spinal cord is protected inside the vertebral
adults, it is seen only upto the
middle
the vertebral
column. Like the brain, the spinal cord is also column. This is because the
covered by meninges. The central canal seen in the spinal cord does not grow in
centre of the spinal cord is also filled with proportion to the growth of
cerebrospinal fluid. In the spinal cord, white matter
the vertebral column
is seen outside and grey matter is seen inside.
Central canal
Dorsal root
of
rious
the
um.
Grey
matter
.
M
White matter
Ventral root
vt
Illustration 1.8 Cross section of the spinal cord
There are 31 pairs of spinal nerves arising from the spinal cord. A dorsal root and
a ventral root join to form a spinal nerve. Sensory impulses reach the spinal cord
through the dorsal root. Motor impulses go out of the spinal cord through the
ventral root. Impulses from different parts of the body are transmitted to and
from the brain through the spinal cord. It also coordinates the repeated movements
during walking, running etc.
Indicators
Protection of the spinal cord.
Formation of the spinal nerves.
DMQY6T
Functions of the spinal cord.​

Answer 1

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Explanation:

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Answer 2

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