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Definition of: endocrine gland
Any of numerous ductless, hormone-secreting structures in various sites in the body which release secretions into surrounding tissue and thence into the bloodstream, either directly or through the lymphatic system.
| Name | Location |
| Adrenals (2) | Anterior to the kidneys |
| Gonads | Sex glands collectively |
| Ovaries (2) | Paired sex glands of the female |
| Pancreas | Upper abdominal cavity |
| Parathyroids | In pairs, near the thyroid |
| Pineal | Attached to the brain, near the pituitary |
| Pituitary | In the floor of the skull |
| Testes (2) | Paired sex glands of the male |
| Thymus | Above the heart |
| Thyroid | Paired lobes, one on each side of the trachea |
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