We must also take into account the location of the gland in our body. This suggests that the first eight houses (and signs) rule over all of our glands. It also highlights the importance of first house (and Aries) and those most influential glands that reside in the head (in the brain). The thyroid, located int eh throat at the level of the adams apple resides on the boundary of Taurus and Gemini. The thymus in the heart centre which open up the debate between 4th and 5th house for so many health conditions related to the chest and heart. The pancreas fits reasonably well with 6th house (Virgo) which is known to have a strong influence on the stomach and metabolism, but one is tempted to apply the 6th & 7th house to the pancreas and the adrenals. Which leaves the 7th & 8th houses (Libra and Scorpio) with control over the testes and ovaries.