Question

describe spinal cord don't copy and spam give me a brilliant answer

Answer 1

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Spinal Cord :

Spinal cord is the part of central nervous

system and forms the lower extension of the

medulla oblongata of the brain. Like the brain,

it is covered and protected by bony covering

and membranes. It lies within the neural canal

of the vertebral column and is surrounded by

three meninges - dura mater, arachnoid mater

and pia mater. The Cerebro Spinal Fluid (CSF)

secreted by pia mater, forms a fluid cushion

around the spinal cord and within it inside the

central canal.

Externally, the spinal cord appears as long

cylindrical rod, 42 to 45 cm long and 2.0 to

2.5 cm broad. The spinal cord is broadest at

its anterior end gradually tapers into conus

medullaris (L1 to L2) and continues as a

thread like filum terminale end posteriorly.

Spinal cord shows two swellings along its

length called cervical and lumbar swelling.

31 pairs of spinal nerves arise from

lateral sides of the spinal cord. These nerves

are concentrated in the region of cervical

and lumbar swelling and around the conus

medullaris. The bunch of nerves in the hind

part of the spinal cord, along with the filum

terminale, appear like a horse’s tail, so called

cauda equina.

T. S. of spinal cord

The spinal cord is dorsoventrally flattened

due to the presence of deep, narrow posterior

fissure and shallow, broad anterior fissure. A

central canal can be seen in the centre. The

fissures divide the spinal cord incompletely

into a right and left side.

The association or inter-neurons lie inside

the grey matter. The receive signal from the

sensory nerve, integrate it and direct the

response towards motor neurons lying towards

the ventral horn. The lateral horns have

neurons of autonomic nervous system (ANS).

The nerves arising from these neurons, emerge

out from the ventral root of spinal nerve.

The white matter consists mainly of bundles

of myelinated nerve fibre called ascending and

descending tracts. The ascending tracts conduct

sensory impulses from spinal cord to the brain

and these lie in the dorsal column/funiculi.

The descending tracts conduct motor impulses

from brain to the lateral and ventral funiculi of

spinal cord.

Functions : The spinal cord is the main centre

for the most reflex actions. It provides pathway

for conduction of sensory and motor impulses

to and from the brain. It provides nervous

connection to many parts of the body.

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Answer 2

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