What's the difference between hereinto and thereinto?

Hereinto

Definition:

• (adv.) Into this.

Example Sentences:

Thereinto

Definition:

• (adv.) Into that or this, or into that place.

Example Sentences:

• (1) The established features distinguishing the accumulation and distribution of the preparation in the subcellular fractions of the liver and brain explain the previously elicited biochemical and physiological shifts occurring in the organism after entrance of gamma-HCCH thereinto.