Outline 3: NS Flashcards

1
Q

Number of Spinal Nerve pairs

A

31

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2
Q

Glia functions

A
  1. Support, nourish, protect cell 2. Mop up excess K+ (maintain extracellular environment) 3. Signaling
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3
Q

Types of neurons

A

Afferent, Efferent, Interneurons

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4
Q

Efferent neurons are:

A

Motor neurons

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5
Q

Efferent neurons have their bodies in…

A

CNS

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6
Q

Afferent neurons are:

A

Sensory neurons

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7
Q

Afferent neurons have their bodies in…

A

PNS

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8
Q

Axons of CNS

A

White matter

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9
Q

Axons of PNS

A

Nerves

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10
Q

Cell bodies of CNS

A

Gray matter

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11
Q

Cell bodies of PNS

A

Ganglia

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12
Q

Number of Cranial Nerve pairs

A

12

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13
Q

Connective tissue enclosing CNS

A

Meninges

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14
Q

Order of meninges (outermost to innermost)

A

Dura mater, arachnoid, pia mater

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15
Q

CSF travels in the…

A

Subarachnoid space

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16
Q

Functions of CSF

A
  1. Reduces brain weight (by 93%) 2. Cushions/shock absorption
17
Q

Spinal cord functions

A
  1. Major reflex center 2. Major conduction pathway between brain and body
18
Q

Spinal cord extends from (X) to (Y).

A

X = foramen magnum Y = L1-L2

19
Q

Spinal cord travels in…

A

Vertebral canal

20
Q

Spinal cord protected by…

A

Bone, ligaments, meninges, CSF

21
Q

Name the two spinal cord segmental enlargements

A
  1. Brachial/cervical enlargement 2. Lumbosacral enlargement
22
Q

Bundles of neuron axons in PNS

23
Q

The end of the spinal cord is termed:

A

Conus medullaris

24
Q

The conus medullaris is present around which spinal processes?

25
After the medullary cone, the Pia continues as a (X), formally termed (Y).
X = filament Y = filum terminale
26
Bundle of spinal nerves after conus medullaris
Cauda equina
27
In spinal cord, gray matter is located (centrally/peripherally), and white matter is located (centrally/peripherally).
1. Centrally 2. Peripherally
28
Gray matter regions in spinal cord:
1. Dorsal horn 2. Ventral horn 3. Intermediate zone 4. Lateral horn
29
Spinal cord dorsal horn involved in..
Sensory functions
30
Spinal cord ventral horn involved in..
Motor functions
31
Spinal cord intermediate zone primarily contains..
Interneurons
32
Spinal cord lateral horn contains..
Pre-ganglionic SNS cell bodies
33
Spinal cord segments containing lateral horn
Thoracic and upper lumbar
34
Dorsal root contains (sensory/motor/both) neurons
Sensory
35
Ventral root contains (sensory/motor/both) neurons
Motor
36
Spinal nerve contains (sensory/motor/both) neurons
Both, sensory and motor
37
The dorsal ramus is (smaller/larger) than ventral ramus. Why?
Smaller It's neurons' axons only innervate deep back muscles and overlying skin. Ventral ramus supplies remaining trunks and limbs.
38
Which portion of spinal cord contains most white matter?
Cervical
39
Label
a) posterior medullary artery b) posterior radicular artery c) anterior medullary artery d) anterior radicular artery