Parenchymal organs meaning
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parenchymal organs definition anatomy
Parenchymal organs are solid organs made mainly of functional tissue, called parenchyma, rather than being hollow tubes or sacs.
Examples include the liver, kidneys, spleen, pancreas, lungs, brain, and thyroid.
- Parenchyma: the cells that perform the organ’s main job. For example, liver cells process nutrients and toxins; kidney tissue filters blood.
- Stroma: the supporting framework of blood vessels, nerves, and connective tissue.
In clinical use, “parenchymal organ injury” usually refers to injury of a solid organ, such as the liver, spleen, or kidney, often after abdominal trauma.
Exocrine glands and endocrine glands property
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exocrine endocrine glands
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endocrine exocrine glands differences anatomy physiology
| Property | Exocrine glands | Endocrine glands |
|---|---|---|
| Ducts | Have ducts | Ductless |
| Where secretion goes | Onto a body surface, into a body cavity, or into an organ lumen through ducts | Into interstitial fluid, then blood |
| Product | Enzymes, mucus, sweat, saliva, milk, sebum, etc. | Hormones |
| Site of action | Usually local, near the secretion site | Often distant target organs or cells |
| Blood supply | Variable | Rich capillary supply, because hormones enter the circulation |
| Examples | Salivary glands, sweat glands, sebaceous glands, gastric glands, lacrimal glands | Pituitary, thyroid, parathyroids, adrenal glands |
| Example of mixed gland | Pancreas: digestive enzymes enter the duodenum through a duct | Pancreas: insulin and glucagon enter the blood |
Key point:
- Exocrine = exits through a duct.
- Endocrine = enters blood without a duct.
Histologically, exocrine glands often have secretory units such as tubules or acini, plus ducts. Endocrine glands lack ducts and their hormone-secreting cells are arranged close to capillaries. This distinction is described in Junqueira’s Basic Histology and Histology: A Text and Atlas.
What is seromucos glands
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seromucous glands
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seromucous glands definition histology
Seromucous glands are mixed exocrine glands that produce both:
- Serous secretion: thin, watery fluid containing proteins and enzymes
- Mucous secretion: thick, slippery secretion rich in mucin, which lubricates and protects surfaces
Their combined product is called seromucous secretion. It helps moisten surfaces, trap particles and microbes, and protect the lining of passages.
Examples:
- Submandibular and sublingual salivary glands
- Glands in the trachea and larger airways
- Some glands of the nasal cavity and larynx
Under the microscope, they contain both serous secretory units (darker-staining cells) and mucous secretory units (paler cells).
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