Olfactory and Limbic Systems

Question 1

Describe the Olfactory Pathway up to Striae

Answer 1

Olfactory Bulb –> Olfactory Tract –> Medial Olfactory Striae and Lateral Olfactory Striae

Question 2

Where does the Medial Olfactory Striae lead?

Answer 2

Hypothalamus (Septal Nuclei)

Question 3

Where does the Lateral Olfactory Striae lead?

Answer 3

1) Uncus (Primary Olfactory cortex)

2) Hippocampus –> Orbito-frontal cortex

Question 4

What is the pathway of the Papez circuit?

Answer 4

Hippocampus>Fimbria>Fornix»Mamillary Body> Thalamus > Cingulate Gyri > Para-Hippocampal Gyrus (Entorhinal Cortex)

Question 5

What is the role of an Association fibre?

Answer 5

Connect cortical fibres within the same hemisphere

Question 6

What is the role of an Commissural fibre?

Answer 6

Connect cortical fibres between the two different hemispheres

Question 7

What is the role of an Projection fibre?

Answer 7

Connect cortical and sub cortical regions

Question 8

What is the function of the Hippocampus?

Answer 8

Long term memory and emotional response (Amygdala is Fear)

Question 9

What structures are found in the Basal Ganglia?

Answer 9

Hippocampus, Caudate Nucleus, Amygdala, Nucleus Acumbens, Putamen, Globus Pallidus (Lentiform Nucleus), Mamillary Bodies

Question 10

What separates the Putamen and Globus Pallidus?

Answer 10

Lateral Medullary Medulla

Medial for 2 parts of the GP

Question 11

What is the Nucleus Acumbens and its role?

Answer 11

Point at which the GP and Putamen are no longer separated

Acts as brains reward centre (Addiction)