Several centers (and their associated motor tracts) in the cerebrum, diencephalon, and brainstem, which may issue somatic motor commands as a result of processing performed at a subconscious level, were long known as the , but is actually now considered inaccurate and misleading.

The correct answer is "reticular formation".

Explanation:

The missing options of this question are:

A) medial lemniscus

B) pyramidal system

C) anterolateral system

D) reticular formation

E) extrapyramidal system

The correct answer is option D) "reticular formation".

The term "reticular formation" was coined to mention a set of interconnected nuclei located along the brainstem, including the cerebrum, diencephalon, and the brainstem itself. Nowadays this term is considered inaccurate and misleading, since it was never well defined and some authors may include some structures that other author do not consider as part of the "reticular formation".

hi~~

i would say that hybridization occurs frequently in nature, because there are many types of hybrids that have occurred naturally, such as the mule (male donkey + female horse)