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20 Dec 2018

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Serotonin is produced in particular high concentrations in the hypothalamus, the "primitive" lower part of the brain and the brain stem, which joins the brain to the top of the spinal cord and is known to contain the centers controlling the level of consciousness.

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I can not interpret the above sentence because of two parts.
Is <the hypothalamus, the "primitive" lower part of the brain and the brain stem> an enumeration stucture like A, B, and C?
Or are the following words just added to explain 'the hypothalamus'?
Is Serotonin produced in the hypothalamus and the brain stem?


I wonder also what the word that'which' relation pronoun clause is describing.
'the hypothalamus' or 'the brain stem' ?

So please the correct interpretation from the following.
1. Serotonin is produced in particular high concentrations in the hypothalamus (which is) the "primitive" lower part of the brain and the brain stem.
And the hypothalamus joins the brain to the top of the spinal cord and is known to contain the centers controlling the level of consciousness.

2. Serotonin is produced in particular high concentrations in the hypothalamus (and) the "primitive" lower part of the brain and the brain stem.
And the brain stem joins the brain to the top of the spinal cord and is known to contain the centers controlling the level of consciousness.

3. Serotonin is produced in particular high concentrations in the hypothalamus (which is) the "primitive" lower part of the brain and the brain stem.
And the brain stem joins the brain to the top of the spinal cord and is known to contain the centers controlling the level of consciousness.

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