BB EOYS4 Flashcards
(47 cards)
what are minature End Plate Potentials cause by? [1]
random release of NT from vesicles sporadically binding with membrane
what is the function of the right Broca’s & Wernickes area? [3]
what is the name for lesion of these areas? ^ [1]
- involved in non-semantic speech recognition and generation: inotation, rhthym and emphasis
- *also: non-language communication skills:** body language / gesture
what is the name for lesion of these areas? ^ [1]
aprosodia
define:
anterograde degeneration [1]
retrograde degeneration [1]
transneuronal degeneration [1]
- *- anterograde degeneration:** when the axon distal to the site of injury degenerates
- *- retrograde degeneration**: when the proximal segment starts to degenerate)
- transneuronal degeneration: the death of neurons resulting from the disruption of input from or output to other nearby neurons.
which two pieces of evidence suggest that AP starts with at NMJ in skeletal muscle? [2]
- the latency of AP increases the further move from NMJ.
- source of greatest depolarisation in the NMJ is closest to the axon terminal
which are the two main inhib NTs of CNS?
- which one is dom in brain [1]
- which one is dom in spinal cord [1]
which are the two main inhib NTs of CNS?
- which one is dom in brain: GABA - B 4 brain !!
- which one is dom in spinal cord: glycine
whar are the SL pictured here? [1]
what type of cell? [1]
whar are the white lines pictured here? [1]
schmidt-lanterman clefts
what type of cell? [1]
schwann cell
Which foramen does the hypoglossal nerve travel through in the skull? [1]
Acceptable responses: Hypoglossal, Hypoglossal canal
what is the role of satellite cells? [1]
where do you find? [1]
which type of staining? [1]
what do they look like? [1]
what is the role of satellite cells? [1]
help maintain the envrioment around neuronal body in the ganglion
where do you find? [1]
cells bodies of ganglia
which type of staining? [1]
H&E
what do they look like? [1]
cuboidal cells
after nerve injury:
how does the cell communicate that its injured? [3]
what transformation does cell undergo (in function?) [1]
how does the cell communicate that its injured? [3]
- get a burst of APs (alerts the cell body in DRG that damage has occurred)
- disruption of retrograde transport flow of trophic support (this is a negative injury signal bc its a stop to normal procedure)
- postive injury signals
= all alert DRG that is damaged !!
what transformation does cell undergo (in function?) [1]
cells in the DRG alter their phenotype (switch from transmission of information state to growth state.
what is wallerian degeneration?
Wallerian degeneration is an active process of retrograde degeneration of the distal end of an axon that is a result of a nerve lesion. It occurs between 7 to 21 days after the lesion occurs. After the 21st day, acute nerve degeneration will show on the electromyograph.
what causes vesicles to be recycled in nervous system? [1]
clathrin
what are the two main barriers to CNS repair?
- *1. hostile environment**
i) scar tissue
ii) myelin-associated inhib proteins (NOGO proteins, MAG, OMGP)
2. poor regenerative response (unlike PNS)
- where does Ach bind to ACh R (specifics !!)
- describe structure of Ach R
what happens when Ach binds to ACHR?
structure: α2βγð subunits; spans across inside of cell, cell membrane and outside of cell (where the binding sites are)
when 2 Ach binds to AchR: change in hydrophobic interactions in alpha helical structure = creates an ion pore
binding occurs of Ach occurs at C loops (of cysteine-cysteine bond)
what is neurapraxia? [1]
what is axonotmesis?
what is neurotmesis?
which of the following are reversible?
neurapraxia: temporary loss of motor and sensory function due to blockage of nerve conduction (temporary damage to myelin). reversible
axonotmesis: disruption of the axons, resulting from severe crush or contusion. myelin and axon damaged. reversible (epineurium still intact)
neurotmesis: both the axons and nerve sheath are disrupted: 3rd degree damage. myelin and axon AND epineurium damaged. partial recovery possible
how does IPSP occur in NS?
NT released that are associated with inhib: GABA & Cl-
- GABA binds to GABAa receptor
- this activates causes an increase in membrane conductance: Chloride ions moves inwards
- *- causes inhib.**
how can you tell which is the pyramidal layer in the cerebral cortex? [1]
where is the pyramidal layer more developed? [2]
how can you tell which is the pyramidal layer in the cerebral cortex? [1]
larger cell bodies
where is the pyramidal layer more developed? [2]
motor & sensory centres
what is the cellular organisation of the cerebral cortex?
which of the following helps to form BBB?
perineurium
endosteum
periosteal
endoneurium
epineurium
which of the following helps to form BBB?
perineurium
endosteum
periosteal
endoneurium
epineurium
which type of imaging is this?
CT venogram
PET scan
CT angiography
CT perfusion
MRI
which type of imaging is this?
CT venogram
PET scan
CT angiography
CT perfusion
MRI
know this !!
how does EPSP occur in CNS cell? [4]
- K+ is greater inside cell, Na+ greater outside
- at rest, K can move across membrane (leak out of the K+ channels): leaves behind a negative resting potential
- nicotinic Ach receptor is permeable to both Na- & K+ ions
- Ach binds to Nicotinic Ach R: causes conformational change: gives rise to depolarisation (bc Na move in?)
- *- activation gives rise to depolarisation of cell**
A: midbrain - identified by the large cerebral peduncles
B: medulla (superior / open)
C: pons - iD by bugle at front
D medulla inferior
which area of the brain contains most of the dopamine neurons in the brain?
cerebellum
temporal
midbrain
occipital
frontal
which area of the brain contains most of the dopamine neurons in the brain?
cerebellum
temporal
midbrain
occipital
frontal
the ribosomes in neuron cell bodies appear as clumps called what? [1]
nissil bodies
Which of the following extrinsic muscles of the tongue is not innervated by the hypoglossal nerve?
Styloglossus
Hyoglossus
Genioglossus
Palatoglossus
Which of the following extrinsic muscles of the tongue is not innervated by the hypoglossal nerve?
Styloglossus
Hyoglossus
Genioglossus
Palatoglossus: VN instead
