Lectures 5-8: Neuroanatomy Flashcards

1
Q

astrocytes =

A

type of glia…

cellular extensions interact with synapses and blood vessels

control composition of extracellular space to allow neuronal function

form scar tissue after injury

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

microglia =

A

type of glia…

brain macrophages

clear infections and debris

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

oligodendrocytes =

A

cellular extensions form insulating myelin sheath around axons to allow rapid nerve impulse conduction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

most abundant type of cell body in the corpus callosum…

A

corpus callosum = white matter therefore is composed of myelinated axons = no neurons…

oligodendrocytes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

local current is influenced by…

A

difference between active and resting potential

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

myelin sheath -

A

increases membrane resistance and decreases capacitance

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

node of ranvier -

A

where ion channels are located

membrane resistance low compared to inter-node

action potential moves by salutatory conduction from node to node, is propagated between nodes by electronic conduction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

evidence that current flow occurs at nodes of ranvier…

A
  • current stimuli needed to reach potential threshold is less if locally applied rather than inter-nodes
  • local application of anaesthetic to block conduction is more effective at nodes than inter-nodes
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

voltage clamp =

A

measures current flowing through ion channels

a feedback amplifier supplies current to rapidly return membrane potential to a chosen level

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

myelination in CNS -

A

by oligodendrocytes

myelinate several inter-nodes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

myelination in PNS -

A

schwann cells

myelinate a single inter-node

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

myelination creates..

A

distinction between white and grey matter in the brain

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

ganglion =

A

collection of neurons in PNS

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

nucleus =

A

collection of neurons in CNS

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

nerve =

A

a bundle of axons in PNS

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

tract =

A

collection of CNS axons with a common site of origin and destination

17
Q

motor neurons concentrated …

A

ventrally (belly/front)

  • motor fibres activate muscle for movement
18
Q

sensory fibres concentrated …

A

dorsally (back) and in head

  • input info from environment
19
Q

fore-brain =

A

cerebral cortex
basal ganglia
thalamus
hypothalamus

20
Q

hind-brain =

A

cerebellum
pons
medulla oblongata

21
Q

brain stem =

A

midbrain
pons
medulla

22
Q

spinal cord…

A

covered by meninges - pia, arachnoid, dura

and irrigated by cerebrospinal fluid - produced by filtration of blood, circulates through spinal canal and the subarachnoid space

23
Q

the brain …

A

protected by skull and meninges and irrigated by cerebrospinal fluid

24
Q

rostral =

A

noseward (anterior)

25
Q

caudal =

A

tailwards (posterior)

26
Q

ventral =

A

belly/front/underneath

27
Q

dorsal =

A

back/on top

28
Q

dermatone =

A

a region of skin innervated by dorsal roots from one spinal segment

29
Q

white matter =

A

ascending and descending myelinated and unmyelinated axons

30
Q

grey matter =

A

contains neuronal cell bodies

31
Q

hypothalamus =

A

head ganglion of the autonomic nervous system

secretes vasopressin and oxytocin via posterior pituitary gland

releases hormones to induce secretion of hormones from anterior pituitary gland

32
Q

motor unit

A

an alpha motor neuron and the group of muscle fibres it innervates

33
Q

two types of neural lesion/ dysfunction :

A

1) white matter = interrupted axnol conduction

2) grey matter = death of neurons

34
Q

syndromes affecting white or grey matter -

A

spine/head injury
stroke
infection e.g meningitis
neural tumour

35
Q

diseases primarily affecting white matter:

A

multiple sclerosis ( CNS inflammatory demylination)

paraplegia (distal degeneration of spinal cord)

neuropathy ( distal demyelination of peripheral nerve)

36
Q

diseases primarily affecting grey matter

A

motor neuron disease (spinomuscular atrophy)

cerebellar diseases

basal ganglia diseases (Huntington’s, Parkinson’s)

temporal/frontal lobe diseases (Alzheimer’s, dementia)