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Organ (anatomy)
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:For other uses, see Organ (disambiguation)
In biology, an organ (Latin: organum, "instrument, tool") is a group of tissues that perform a specific function or group of functions. Usually there's a main tissue and sporadic tissues. The main tissue is the one that's unique for the specific organ. For example, main tissue in the heart is the myocardium, while sporadic are the nervous, blood, connective etc.
Animal organs
Common animal (including human) organs include the heart, lungs, brain, eye, stomach, spleen, bones, pancreas, kidneys, liver, intestines, skin (the largest human organ), uterus, and bladder. Animal organs inside the body are often referred to as internal organs. The internal organs collectively are often called viscera, the plural of the rarely-used term viscus.
Plant organs
Plant organs can be divided into vegetative and reproductive. Vegetative plant organs are root, stem and leaf, while reproductive are flower, seed and fruit.
The vegetative organs are essential for maintaining the life of a plant (they do the vegetative, vital functions, like photosynthesis), while the reproductive are essential in the
reproduction. But, if there's asexual vegetative reproduction, the vegetative organs are those which create the new generation of plants; therefore usually creating a clonal colony.Asexual reproduction is usually done by single celled organisms.
Organ systems
A group of related organs is an organ system. Organs within a system may be related in any number of ways, but relationships of function are most commonly used. For example the urinary system comprises organs that work together to produce, store, and carry urine.
The functions of organ systems often share significant overlap. For instance, the nervous and endocrine system both operate via a shared organ, the hypothalamus. For this reason, the two systems are combined and studied as the neuroendocrine system. The same is true for the musculoskeletal system, which involves the relationship between the muscular the skeletal system and the digestive system.
Organs of the human body by region
Head and neck
Back
vertebra
spinal cord
Thorax
mammary gland
lungs
heart
mediastinum
oesophagus
diaphragm
thymus
Abdomen
peritoneum
stomach
duodenum
intestine
colon
liver
spleen
pancreas
kidney
adrenal gland
appendix
Pelvis and perineum
pelvis
sacrum
coccyx
ovaries
Fallopian tube
uterus
vagina
vulva
clitoris
perineum
urinary bladder
testicles
rectum
penis
Upper limbs/Lower limbs
muscle
skeleton
nerves
hand
wrist
elbow
shoulder
hip
knee
ankle
External results
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