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CNS Exam 2 PCC Torgerud > Exam 2 > Flashcards

Exam 2 Flashcards

1
Q

How many neurons does the spinal cord have?

A

long and thin and can contain up to 100 million neurons

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2
Q

how long is the spinal cord?

A

40-45 cm or 16-18 inches (most 18 inches)

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3
Q

what is the diameter of the spinal cord?

A

1.3cm maximum diameter (in cervical enlargement)

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4
Q

At what area does the cord occupy 75% of the vertebral canal

A

C5-C6

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5
Q

How much does the spinal cord weigh

A

27-35 grams in weight only 2% of the total CNS weight

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6
Q

what is the superior boundary of the spinal cord

both convenient and precise

A

foramen magnum for convenience: the superior most ventral rootlet of the first cervical spinal nerve when being precise. C1 nerve rootlet/superior most anterior C1 rootlet

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7
Q

what is the inferior boundary of the spinal cord (adult)

A

the disc between vertebral levels L1-L2 (90%) (leaves almost one third of vertebral canal and sacral canal below) Conus Medularis disc level between L1-L2

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8
Q

How many spinal nerve pairs exist

A

31 pairs

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9
Q

Each spinal nerve will have what kind of rootlets within the vertebral canal

A

dorsal and ventral roots

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10
Q

states that dorsal roots contain sensory (afferent) fibers and ventral roots are motor (efferent) fibers. exceptions when a few afferent fibers come through the ventral roots

A

Bell-Magendi Law

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11
Q

Roots (rootlets) spinal nerves and their rami are PNS or CNS structures

A

PNS

The only CNS structure in the vertebral canal is the spinal cord itself

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12
Q

C1 exits between what

A

occiput and atlas (occasionally missing dorsal rootlets)

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13
Q

C4 exits at IVF between what

A

C3 and C4 vertebrae (always one above and the one below)

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14
Q

C8 exits at the IVF between what

A

C7 and T1 vertebrae

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15
Q

What are the cervical nerves

A

C1-C8 vertebrae

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16
Q

What are the thoracic nerves

A

T1-T12 vertebrae

17
Q

T1 exits at IVF between what

A

T1 and T2 vertebrae (same level then one below)

18
Q

T6 exits at IVF between what

A

T6 and T7 vertebrae

19
Q

T12 exits at IVF between what

A

T12 and L1 vertebrae

20
Q

The rami consist of what kinds of nerves

A

mixed: motor and sensory

21
Q

The rootlets consist of what kinds of nerves

A

Motor or Sensory

22
Q

What are the Lumbar Nerves

A

L1-L5

23
Q

L1 exits at IVF between what

A

L1 and L2 Vertebrae (like thoracic)

24
Q

L5 exits IVF between what

A

L5 and S1 vertebrae

25
Q

how many bones fuse together to form the sacrum

A

5 bones

26
Q

what are the sacral nerves

A

S1-S5

27
Q

S1-S4 nerves exit where

A

The dorsal and ventral sacral foramina

28
Q

S5 exits where

A

The sacral hiatus

29
Q

What is the coccygeal nerve abbreviated as

A

Co1

30
Q

Where does the Co1 exit at

A

the sacral hiatus (this nerve may be missing)

CNS Exam 2 PCC Torgerud (1 decks)

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