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AUDI 402 > Lesson 13: Limbic System > Flashcards

Lesson 13: Limbic System Flashcards

1
Q

What are the four main structures of the Papez Circuit?

A

Amygdala
Hippocampus
Cingulate gyrus
Septum

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2
Q

What is the role of the fornix?

A

Connects the hypothalamus with the hippocampus, and then the olfactory cortex

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3
Q

What is the role of the cingulum?

A

Connects the cingulate gyrus with the parahippocampal lobe and the hippocampus

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4
Q

What is the role of the stria terminalis?

A

Connects the septum and the amygdala

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5
Q

What is the role of the medial forebrain bundle?

A

Connects the mammillary bodies and the septum

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6
Q

What is the role of the mammillothalamic tract?

A

Connects the mammillary bodies and the neocortex

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7
Q

What are the 3 main roles of the septum?

A

Hormone secretion
Behavioural reaction
Memory facilitation

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8
Q

What are the two main roles of the cingulate gyrus?

A

Anxiety

Altered behaviour

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9
Q

What are the 4 main functions of the limbic system?

A

Memory
Olfactory
Viscera
Emotion

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10
Q

What occurs with removal of the amygdala? When would this be done?

A

Those with hyper-aggressive behaviour

Hyper-sexual, increased interest in food, decreased aggression
Emotional liability, restlessness

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11
Q

Decorticate rigidity
Location
What occurs
Symptoms

A

Lesion between red nucleus and cortex
Cuts off influence of corticospinal tract = no modulation from the cerebrum of the RF, VF, red nuc
Symptoms: flexion of the upper limbs, extension of lower
PATTERN

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12
Q

Decerebrate rigidity
Location
What occurs
Symptoms

A

Mid-brainstem lesion
Lower RF and VF - uncheck by red nuc
Symptoms: extension of BOTH upper and lower limbs
VERY strong rigidity

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13
Q 
Correctly locate:
fornix
amygdala
hippocampus
cingulate gyrus
septal nuclei
mammillary bodies
ant thalamus
RT
olfactory tract
A

See image

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14
Q

What are the two main roles of the reticular system (ascending)?

A

Alertness and attentiveness

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15
Q

How does the reticular system modulate alertness?

A

Ascending RF responds to sensory input = levels of alertness

Controls fatigue via melatonin in pineal gland

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16
Q

How does the RF modulate attentiveness?

A

Ascending RF screens input, assigns importance

17
Q

What does the descending RF modulate (2)?

A

Breathing

Muscle tone

18
Q

What occurs with damage to the alert portion of the RF? What about the attentive portion?

A

Alert: levels of consciousness
Attentive: bewildering confusion

AUDI 402 (14 decks)

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