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Pineal gland

Glandula pinealis

Named for its pine cone shape, the pineal gland produces melatonin, the hormone that regulates circadian sleep-wake cycles and seasonal biological rhythms; its output rises in darkness and falls with light exposure. This small gland sits behind the third ventricle at the epithalamus, between the two superior colliculi, and receives sympathetic innervation by way of the superior cervical ganglion. Its pinealocytes synthesize melatonin from serotonin in response to darkness signals relayed from the retina. A pineal tumor can obstruct the cerebral aqueduct and cause hydrocephalus, while pineal calcification is a normal finding on CT that serves as a midline marker. Disrupted melatonin production is implicated in sleep disorders and jet lag.

A small, pine cone-shaped gland located posterior to the third ventricle at the epithalamus, between the two superior colliculi. It receives sympathetic innervation via the superior cervical ganglion. Pinealocytes produce melatonin from serotonin in response to darkness signals from the retina.

On this page
प्रकार Gland
शरीर तंत्र Endocrine
शरीर क्षेत्र Brain
लैटिन नाम Glandula pinealis
FMA ID 62033

कार्य

Produces melatonin, which regulates circadian rhythms (sleep-wake cycles) and seasonal biological rhythms. Melatonin production increases in darkness and decreases with light exposure.

नैदानिक महत्व

Pineal tumors can cause obstructive hydrocephalus due to compression of the cerebral aqueduct. Pineal calcification is a normal finding on CT scans and can serve as a midline marker. Disrupted melatonin production affects sleep disorders and jet lag.

Frequently Asked Questions

What is the pineal gland?

The pineal gland is a small, pine cone-shaped gland located posterior to the third ventricle at the epithalamus, nestled between the two superior colliculi. It is part of the endocrine system and plays a role in regulating circadian rhythms.

Where is the pineal gland located?

The pineal gland is situated at the epithalamus, posterior to the third ventricle, between the two superior colliculi of the midbrain. It occupies the center of the brain at roughly the midline.

What is the function of the pineal gland?

The pineal gland's primary function is to produce melatonin from serotonin in response to darkness signals relayed from the retina. This melatonin secretion helps regulate the sleep-wake cycle and circadian rhythms.

What conditions may be associated with the pineal gland?

Pineal gland abnormalities may be associated with disrupted melatonin production, which is involved in sleep disorders and circadian rhythm disturbances. Pineal cysts and rare pineal tumors are also known to affect this structure.

What does the pineal gland look like?

The pineal gland is a small, pine cone-shaped structure, typically about 5–8 mm in length. It receives sympathetic innervation via the superior cervical ganglion and appears as a reddish-gray nodule on brain imaging.

References

  1. Foundational Model of Anatomy — FMA:62033 Reference anatomy ontology (University of Washington)
  2. Wikipedia — Pineal gland Encyclopedia article (verified cross-reference)

चिकित्सा अस्वीकरण

यह सामग्री केवल शैक्षिक और सूचनात्मक उद्देश्यों के लिए है। इसे पेशेवर चिकित्सा सलाह, निदान या उपचार के विकल्प के रूप में नहीं माना जाना चाहिए। किसी चिकित्सा स्थिति के बारे में आपके किसी भी प्रश्न के लिए हमेशा अपने चिकित्सक या अन्य योग्य स्वास्थ्य प्रदाता से सलाह लें। इस वेबसाइट पर पढ़ी गई किसी बात के कारण कभी भी पेशेवर चिकित्सा सलाह को नजरअंदाज न करें या इसे लेने में देरी न करें।

Educational Disclaimer

This content is for educational and informational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider for medical decisions.

Data sources: Terminologia Anatomica, Foundational Model of Anatomy, Wikidata.