pineal gland
Brain's sleep regulator
The pineal gland is a small, pine-cone-shaped structure deep in the brain that produces melatonin, a hormone regulating sleep cycles.
Descartes famously proposed it as the seat of the soul—the point where mind and body interact.
In some reptiles it functions as a light-sensitive "third eye." Modern medicine focuses on its role in circadian rhythms.
Daily biological cycle
- dreamsInvoluntary sleep visions
- insomniaPersistent inability to rest
- REMAcronym for dreaming phase
- NREMSleep lacking eye movement
sleep regulation · drowsiness · fatigue · slumber · nighttime · rest · sleep disorders · somnolence
Metaphysical perception organ
- consciousnessState of sentient awareness
- enlightenmentProfound spiritual awakening
- chakraSpiritual node in body
- spiritualityConnection to the sacred
awareness · clairvoyance · meditation · psychic · intuition · Descartes · kundalini · inner vision
Built-in sleep-wake cycle
- sleep-wake cycleDaily pattern of rest
- biological clockInnate cycle regulator
- light sensitivityAdverse reaction to brightness
- chronobiologyStudy of living timing patterns
Seat of cognition
- hypothalamusSubthalamic regulatory brain region
- thalamusBrain's signal switchboard
- cerebrumBrain's largest division
- pituitaryBrain-base hormone gland
neurons · calcification · neuroanatomy · ventricle · midbrain · central nervous system · cone-shaped · pea-sized
circadian
Daily biological cycle
NREM · sleep regulation · drowsiness · fatigue · slumber · nighttime · rest · sleep disorders · somnolence · seasonal affective disorder
third eye
Metaphysical perception organ
- consciousnessState of sentient awareness
- enlightenmentProfound spiritual awakening
- chakraSpiritual node in body
spirituality · awareness · clairvoyance · meditation · psychic · intuition · Descartes · kundalini · inner vision · transcendence
circadian rhythm
Built-in sleep-wake cycle
- sleep-wake cycleDaily pattern of rest
- biological clockInnate cycle regulator
- light sensitivityAdverse reaction to brightness
chronobiology · jet lag · seasonal rhythms · tryptophan · synthesis
brain
Seat of cognition
- hypothalamusSubthalamic regulatory brain region
- thalamusBrain's signal switchboard
- cerebrumBrain's largest division
pituitary · neurons · calcification · neuroanatomy · ventricle · midbrain · central nervous system · cone-shaped · pea-sized · interbrain
- brain anatomybrain, cerebrum, cerebellum, brainstem, cortex
- neuroanatomybrain, cerebellum, cerebral cortex, thalamus, hypothalamus
- biorhythmscircadian rhythm, circadian rhythms, circadian clock, biological clocks, biological clock
- brain partscerebellum, hippocampus, brainstem, thalamus, hypothalamus
- brain regionscerebrum, frontal lobe, temporal lobe, parietal lobe, occipital lobe
- endocrine glandsadrenals, adrenal, parathyroid, pituitary, thyroid
pineal glandpituitary gland
Brain-base hormone producer
hypothalamus · master gland · adrenal glands · thyroid gland · gonads
pineal glandcerebral cortex
Brain's outer neural sheet
cerebrum · frontal lobe · hippocampus · brainstem · cerebellum
pineal glandappendix
Supplementary section after main text
gallbladder · spleen · earlobe
pinecone, gland, glands, glandular, pineal, pine cone, pituitary gland, thyroid gland, adrenal gland