1. Cerebrum: It is the anterior, oval-shaped larger part of the brain. It is situated in the upper portion of the cranial cavity. This contains the important centres of hearing, speech, sight, etc. The pineal gland which is regarded as the seat of the soul and which plays a prominent part in Samadhi and psychic phenomena is situated here.
2. Cerebellum, the little or hind brain: This is the main portion of the brain, oblong-shaped, situated just above the fourth ventricle and below and behind the brain. Here the grey matter is arranged over the white matter. It regulates the muscular co-ordination. Mind rests here during dreams.
3. Medulla Oblongata: It is the beginning place of the spinal cord at the cranial cavity, where it is oblong-shaped and wide. It is between the two hemispheres. Here the white matter is placed over the grey matter. This contains the centres of important functions such as circulatory, respiratory, etc. This portion must be carefully protected.
4. Pons Varolii: It is the bridge that lies before the Medulla Oblongata. It is made of white and grey fibres that come from cerebellum and medulla. This is the junction where cerebellum and medulla meet.
There are five ventricles of the brain. The fourth is the most important one. It is situated in Medulla Oblongata. The fourth ventricle is the name of the central canal of the spinal cord, “Canalis Centralis” when it enters the cranial cavity. Here the tiny canal becomes bigger in size.
Every nerve of the body is closely connected with the brain. The 12 pairs of cranial nerves proceed from both hemispheres through the openings at the base of the skull to different parts of the body: Olfactory; Optic; Motor Oculi; Pathetic; Trifacial; Abducens; Facial; Auditory; Glossopharyngeal; Pneumogastric, Spinal accessory; and Hypo-glossal. These are the nerves that are connected with the eye, ear, tongue, nose, pharynx, thorax, etc. For a detailed study of this section refer to any book on anatomy. Here I have given you portions that are connected with Kundalini Yoga.
Brahmarandhra
“Brahmarandhra” means the hole of Brahman. It is the dwelling house of the human soul. This is also known as “Dasamadvara,” the tenth opening or the tenth door. The hollow place in the crown of the head known as anterior fontanelle in the new-born child is the Brahmarandhra. This is between the two parietal and occipital bones. This portion is very soft in a babe. When the child grows, it gets obliterated by the growth of the bones of the head. Brahma created the physical body and entered (Pravishat) the body to give illumination inside through this Brahmarandhra. In some of the Upanishads, it is stated like that. This is the most important part. It is very suitable for Nirguna Dhyana (abstract meditation). When the Yogi separates himself from the physical body at the time of death, this Brahmarandhra bursts open and Prana comes out through this opening (Kapala Moksha). “A hundred and one are the nerves of the heart. Of them one (Sushumna) has gone out piercing the head; going up through it, one attains immortality” (Kathopanishad).
Sahasrara Chakra
Sahasrara Chakra is the abode of Lord Siva. This corresponds to Satya Loka. This is situated at the crown of the head. When Kundalini is united with Lord Siva at the Sahasrara Chakra, the Yogi enjoys the Supreme Bliss, Parama Ananda. When Kundalini is taken to this centre, the Yogi attains the superconscious state and the Highest Knowledge. He becomes a Brahmavidvarishtha or a full-blown Jnani.
The word Sahasradala-Padma denotes that this Padma has 1000 petals. That is, one thousand Yoga Nadis emanate from this centre. There are different opinions about the exact number of petals. It is quite sufficient if you know that innumerable Nadis proceed from this centre. As in the case of other Chakras, the vibrations that are made by the Yoga Nadis are represented by the Sanskrit letters. All the 50 letters of the Sanskrit alphabet are repeated here again and again on all Yoga Nadis. This is a Sukshma centre. The corresponding centre in the physical body is in the brain.
The term “Shat-Chakras” refers only to the chief six Chakras, viz., Muladhara, Svadhishthana, Manipura, Anahata, Vishuddha and Ajna. Above all these we have Sahasrara Chakra. This is the chief of all the Chakras. All the Chakras have their intimate connection with this centre. Hence this is not included as one among the Shat-Chakras. This is situated above all the Chakras.
Lalana Chakra
Lalana Chakra is situated at the space just above Ajna and below Sahasrara Chakra. Twelve Yoga Nadis emanate from this centre. The vibrations that are made by the 12 Nadis are represented by the Sanskrit letters: (Ha, Sa, Ksha, Ma, La, Va, Ra, Ya, Ha, Sa, Kha and Phrem). It has OM as its Bija. At this centre the Yogi concentrates on the form of his Guru and obtains all knowledge. This has control over the 12 pairs of nerves that proceed from the brain to the different sense-organs.
Summary Of The Previous Lessons
Aspirants must have all the Sattvic qualities and should be quite free from impurities. Satsanga, seclusion, dietetic discipline, good manners, good character, Brahmacharya, Vairagya, etc., form the strong foundation of Yogic life. The help of a Guru, who has already trodden the path, is absolutely necessary for quick progress in the spiritual path. Places of cool, temperate climate are required for Yoga Abhyasa.
Nadis are the Sukshma (astral) channels through which Prana (vital energy) flows to different parts of the body. Ida, Pingala and Sushumna are the most important of the innumerable Nadis. All Nadis start from the Kanda. Kanda is located in the space between the origin of the reproductory organ and the anus. Sushumna Nadi is situated within the Spinal Column, in the spinal canal. Within the Sushumna Nadi there is a Nadi by name Vajra. Chitra Nadi, a minute canal, which is also called Brahmanadi, is within this Vajra Nadi. Kundalini, when awakened, passes through Chitra Nadi. These are all Sukshma centres and you cannot have any laboratory tests and test-tube experiments. Without these subtle centres, the gross physical body cannot exist and function. Muladhara, Svadhishthana, Manipura, Anahata, Vishuddha, Ajna and Sahasrara are the important Chakras. When Kundalini passes on from Chakra to Chakra, layer after layer of the mind becomes opened and the Sadhaka enters into higher states of consciousness. At every Chakra he gets various Siddhis. Ida, Pingala and other Nadis are on the sides of the spine. Ida flows through the left nostril and Pingala through the right nostril. In Svara Sadhana the breath should flow by the left nostril throughout the day and by the right nostril throughout the night.
The Mysterious Kundalini
Manastvam Vyoma tvam Marudasi Marutsarathirasi,
Tvamapastvam Bhumistvayi parinatayam nahi param,
Tvameva Svatmanam parinamayitum visvavapusha
Chidanandakaram haramahishi-bhavena bibhrushe.
“O Devi! Thou art the mind, the sky, the air, the fire, the water, and the earth. Nothing is outside Thee on Thy transformation. Thou hast become Siva’s consecrated queen to alter Thy own blissful conscious Form in the shape of the world”.
