Endocrine glands
Endocrine glands , glandulae endocrinae, in contrast to glands of external secretion of excretory ducts do not. Endocrine glands produce a secret, or hormones, entering the blood (venous) or lymphatic capillaries. Tissue formations of these glands are intertwined with a dense network of blood and lymphatic capillaries. The endocrine glands include: thyroid gland, glandula thyroidea; Parathyroid glands, glandulae parathyroideae; Thymus gland (thymus), thymus; Adrenal glands, glandulae suprarenales; Paraganglia (chromaffin bodies), paraganglia; Gonads - testes, testes, and ovaries, ovaria; Hypophysis, hypophisis (glandula pituitaria); Pineal body, corpus pineale; Pancreas, pancreas (its endocrine part).
Endocrine glands
Despite the fact that a number of glands are functionally connected, their embryonic origin is different. Given genetic signs, endocrine glands can be divided into five groups:
1. Endodermal branhyogenic glands, which are derivatives of the epithelium of the gill pockets. These include the thyroid gland, parathyroid glands and thymus gland.
2. Endodermal glands, which are the endocrine part of the pancreas.
3. Mesodermal glands developing from coelomic epithelium. These include the cortex of the adrenal glands and the sex glands.
4. Ectodermal glands developing from sympathetic elements. These include the adrenal medulla and paraganglia.
5. Neurogenic (ectodermal) glands associated with the development of the intermediate brain. These include the pituitary and pineal gland.
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