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Spinal meninges Flashcards

(14 cards)

1
Q

Dura mater

A

tough, fibrous membrane that forms the spinal dural sac

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2
Q

Epidural space

A

a space that exists between the dura mater of the spinal cord and the periosteum of the vertebrae- it contains fat, arachnoid trabeculae and a venous plexus

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3
Q

arachnoid mater

A

thin, avascular membrane that lines the dural sac and the dural root sheaths

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4
Q

subarachnoid space

A

lies between the arachnoid mater and pia mater, it contains cerebrospinal fluid, arteries and veins

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5
Q

pia mater

A

thin, transparent membrane that directly covers the spinal cord, the roots of the spinal nerves and the spinal blood vessels

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6
Q

Dural root sheaths

A

lateral extensions of the spinal dura mater which surround the nerve roots

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7
Q

Denticulate ligament

A

fibrous sheet of pia mater, which suspends the spinal cord in the dural sac- it extends laterally from the spinal cord and attaches to the inner surface of the dural sac

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8
Q

What level does the spinal cord terminate?

A

level of L1

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9
Q

Where do the spinal meninges terminate

A

level of S2- between L1 and S2 is the dural sac- samples of CSF may be withdrawn from the dural sac

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10
Q

Lumbar puncture:

A

needle is usually inserted between L3/L4 vertebrae (or L4/L5)

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11
Q

How is the level of L4 determined for a lumbar puncture?

A

the spinous process of L4 is determined by the supracristal plane- this transects the highest points of the iliac crests

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12
Q

what is spina bifida occulta?

A

this is failure of the vertebral arch fusion alone, a dimple or tuft of hair may overlie the abnormality

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13
Q

What is meningomyelocele?

A

failure of vertebral arch fusion, herniation of the meninges and elements of the spinal cord- may result in paralysis of the limbs and faecal and urinary incontinence

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14
Q

What is meningocele?

A

failure of vertebral arch fusion, with herniation of the meninges- may be corrected with surgery with minimal consequences (no elements of spinal cord)

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