Brain

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Sagittal section through the human brain (Johannes Sobotta: Atlas der descriptiven Anatomie des Menschen, Band III, J.F. Lehmanns, Munich 1919, p. 606 archive.org).

The brain (Latin: cerebrum; Greek: Ενκέφαλον encephalon "in the head", from εν en "in" and κεφαλή kephalé "head") is the part of the central nervous system (CNS) of vertebrates and humans that lies protected in the cranial cavity. The physical brain is built up and constantly regenerated (especially during sleep) by the underlying etheric brain.

The brain and the spinal cord located in the vertebral canal (Canalis vertebralis) are surrounded by two soft (Pia mater and Arachnoidea) and one hard brain or spinal cord skin (Dura mater). The cerebrospinal fluid (CSF, Liquor cerebrospinalis) circulates through the subarachnoid space between the two soft meninges and rises and falls with the rhythm of breathing.

From an anthroposophical point of view, the brain serves mainly as a richly differentiated mirroring apparatus that reflects the spiritual and sensory-physical activity of the human being into the soul and thus into consciousness, whereby, however, very different degrees of consciousness arise depending on which layer of the brain produces the reflection. The older the corresponding brain structure is developmentally, the duller is usually the associated degree of consciousness. The waking consciousness of today's human being is bound to extensive parts of the cerebral cortex. This is also where thoughts are mirrored and thus made conscious. The actual organ of thought, however, is the etheric brain, which constantly shapes and regenerates the physical brain. The brain is a visible product of the same formative forces that also shape animals and plants in an invisible way, right down to the crystals.

„In the spiritual organism of man, in his nervous system developed into a perfect brain, one has sensually-visibly before one what works in the plants and animals as an unsensible power entity.“ (Lit.:GA 9, p. 154)

Spiritual research shows the brain to be a lunar organ (see below), which is even to a certain extent under the influence of the lunar rhythms. The mutual relationship of heart and brain corresponds in the macrocosm to the relationship of the Sun to the Moon (Lit.:GA 107, p. 109). The corresponding planetary metal is silver.

Literatur
References to the work of Rudolf Steiner follow Rudolf Steiner's Collected Works (CW or GA), Rudolf Steiner Verlag, Dornach/Switzerland, unless otherwise stated.
Email: verlag@steinerverlag.com URL: www.steinerverlag.com.
Index to the Complete Works of Rudolf Steiner - Aelzina Books
A complete list by Volume Number and a full list of known English translations you may also find at Rudolf Steiner's Collected Works
Rudolf Steiner Archive - The largest online collection of Rudolf Steiner's books, lectures and articles in English.
Rudolf Steiner Audio - Recorded and Read by Dale Brunsvold
steinerbooks.org - Anthroposophic Press Inc. (USA)
Rudolf Steiner Handbook - Christian Karl's proven standard work for orientation in Rudolf Steiner's Collected Works for free download as PDF.
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