A 3D medical animation still of spleen structure and exact location
The spleen is an organ found in almost all vertebrates. Similar in structure to a large lymph node, it acts primarily as a blood filter. The word spleen comes from Ancient Greekσπλήν (splḗn).[1]
The spleen houses antibody-producing lymphocytes in its white pulp and monocytes which remove antibody-coated bacteria and antibody-coated blood cells by way of blood and lymph node circulation. These monocytes, upon moving to injured tissue (such as the heart after myocardial infarction), turn into dendritic cells and macrophages while promoting tissue healing.[5][6][7] The spleen is a center of activity of the mononuclear phagocyte system and is analogous to a large lymph node, as its absence causes a predisposition to certain infections.[8][4]
The spleen is underneath the left part of the diaphragm, and has a smooth, convex surface that faces the diaphragm. It is underneath the ninth, tenth, and eleventh ribs. The other side of the spleen is divided by a ridge into two regions: an anterior gastric portion, and a posterior renal portion. The gastric surface is directed forward, upward, and toward the middle, is broad and concave, and is in contact with the posterior wall of the stomach. Below this it is in contact with the tail of the pancreas. The renal surface is directed medialward and downward. It is somewhat flattened, considerably narrower than the gastric surface, and is in relation with the upper part of the anterior surface of the left kidney and occasionally with the left adrenal gland.
There are four ligaments attached to the spleen: gastrosplenic ligament, splenorenal ligament, colicosplenic ligament, and phrenocolic ligament.[10]
The spleen, in healthy adult humans, is approximately 7 to 14 centimetres (3 to 5+1⁄2 in) in length.
An easy way to remember the anatomy of the spleen is the 1×3×5×7×9×10×11 rule. The spleen is 1 by 3 by 5 inches (3 by 8 by 13 cm), weighs approximately 7 oz (200 g), and lies between the 9th and 11th ribs on the left-hand side and along the axis of the 10th rib. The weight varies between 1 oz (28 g) and 8 oz (230 g) (standard reference range),[12] correlating mainly to height, body weight and degree of acute congestion but not to sex or age.[13]
Back of lumbar region, showing surface markings for kidneys, ureters, and spleen
Side of thorax, showing surface markings for bones, lungs (purple), pleura (blue), and spleen (green)
Blood supply
Visceral surface of the spleen
Near the middle of the spleen is a long fissure, the hilum, which is the point of attachment for the gastrosplenic ligament and the point of insertion for the splenic artery and splenic vein. There are other openings present for lymphatic vessels and nerves. In addition to the splenic artery, collateral blood supply is provided by the adjacent short gastric arteries.[14]
The spleen is unique in respect to its development within the gut. While most of the gut organs are endodermally derived, the spleen is derived from mesenchymal tissue.[18] Specifically, the spleen forms within, and from, the dorsal mesentery. However, it still shares the same blood supply—the celiac trunk—as the foregut organs.
Function
Pulp
Micrograph of splenic tissue showing the red pulp (red), white pulp (blue) and a thickened inflamed capsule (mostly pink – top of image). H&E stain.The spleen contains two different tissues, white pulp (A) and red pulp (B). The white pulp functions in producing and growing immune and blood cells. The red pulp functions in filtering blood of antigens, microorganisms, and defective or worn-out red blood cells.
Creation of red blood cells. While the bone marrow is the primary site of hematopoiesis in the adult, the spleen has important hematopoietic functions up until the 5th month of gestation. After birth, erythropoietic functions cease, except in some hematologic disorders. As a major lymphoid organ and a central player in the reticuloendothelial system, the spleen retains the ability to produce lymphocytes and, as such, remains a hematopoietic organ.
Storage of red blood cells, lymphocytes and other formed elements. The spleen of horses stores roughly 30 percent of the red blood cells and can release them when needed.[20] In humans, up to a cup (240 ml) of red blood cells is held within the spleen and released in cases of hypovolemia[21] and hypoxia.[22] It can store platelets in case of an emergency and also clears old platelets from the circulation. Up to a quarter of lymphocytes are stored in the spleen at any one time.
The spleen is the largest collection of lymphoid tissue in the body. It is normally palpable in preterm infants, in 30% of normal, full-term neonates, and in 5% to 10% of infants and toddlers. A spleen easily palpable below the costal margin in any child over the age of 3–4 years should be considered abnormal until proven otherwise.
Splenomegaly can result from antigenic stimulation (e.g., infection), obstruction of blood flow (e.g., portal vein obstruction), underlying functional abnormality (e.g., hemolytic anemia), or infiltration (e.g., leukemia or storage disease, such as Gaucher's disease). The most common cause of acute splenomegaly in children is viral infection, which is transient and usually moderate. Basic work-up for acute splenomegaly includes a complete blood count with differential, platelet count, and reticulocyte and atypical lymphocyte counts to exclude hemolytic anemia and leukemia. Assessment of IgM antibodies to viral capsid antigen (a rising titer) is indicated to confirm Epstein–Barr virus or cytomegalovirus. Other infections should be excluded if these tests are negative.
Asplenia refers to a non-functioning spleen, which may be congenital, or caused by traumatic injury, surgical resection (splenectomy) or a disease such as sickle cell anaemia. Hyposplenia refers to a partially functioning spleen. These conditions may cause[6] a modest increase in circulating white blood cells and platelets, a diminished response to some vaccines, and an increased susceptibility to infection. In particular, there is an increased risk of sepsis from polysaccharide encapsulated bacteria. Encapsulated bacteria inhibit binding of complement or prevent complement assembled on the capsule from interacting with macrophage receptors. Phagocytosis needs natural antibodies, which are immunoglobulins that facilitate phagocytosis either directly or by complement deposition on the capsule. They are produced by IgMmemory B cells (a subtype of B cells) in the marginal zone of the spleen.[23][24]
A splenectomy (removal of the spleen) results in a greatly diminished frequency of memory B cells.[25] A 28-year follow-up of 740 World War II veterans whose spleens were removed on the battlefield showed a significant increase in the usual death rate from pneumonia (6 rather than the expected 1.3) and an increase in the death rate from ischemic heart disease (41 rather than the expected 30), but not from other conditions.[26]
Accessory spleen
An accessory spleen is a small splenic nodule extra to the spleen usually formed in early embryogenesis. Accessory spleens are found in approximately 10 percent of the population[27] and are typically around 1 centimeter in diameter. Splenosis is a condition where displaced pieces of splenic tissue (often following trauma or splenectomy) autotransplant in the abdominal cavity as accessory spleens.[28]
Polysplenia is a congenital disease manifested by multiple small accessory spleens,[29] rather than a single, full-sized, normal spleen. Polysplenia sometimes occurs alone, but it is often accompanied by other developmental abnormalities such as intestinal malrotation or biliary atresia, or cardiac abnormalities, such as dextrocardia. These accessory spleens are non-functional.
Splenic infarction is a condition in which blood flow supply to the spleen is compromised,[30] leading to partial or complete infarction (tissue death due to oxygen shortage) in the organ.[31]
Splenic infarction occurs when the splenic artery or one of its branches are occluded, for example by a blood clot. Although it can occur asymptomatically, the typical symptom is severe pain in the left upper quadrant of the abdomen, sometimes radiating to the left shoulder. Fever and chills develop in some cases.[32] It has to be differentiated from other causes of acute abdomen.
There has been a long and varied history of misconceptions regarding the physiological role of the spleen, and it has often been seen as a reservoir for juices closely linked to digestion.[35] In various cultures, the organ has been linked to melancholia, due to the influence of ancient Greek medicine and the associated doctrine of humourism, in which the spleen was believed to be a reservoir for an elusive fluid known as "black bile" (one of the four humours).[35] The spleen also plays an important role in traditional Chinese medicine, where it is considered to be a key organ that displays the Yin aspect of the Earth element (its Yang counterpart is the stomach). In contrast, the Talmud (tractate Berachoth 61b) refers to the spleen as the organ of laughter while possibly suggesting a link with the humoral view of the organ.
Etymologically, spleen comes from the Ancient Greekσπλήν (splḗn), where it was the idiomatic equivalent of the heart in modern English. Persius, in his satires, associated spleen with immoderate laughter.[36]
Must I observe you? must I stand and crouch
Under your testy humour? By the gods
You shall digest the venom of your spleen,
Though it do split you; for, from this day forth,
I'll use you for my mirth, yea, for my laughter,
When you are waspish.[37]
The spleen, as a byword for melancholy, has also been considered an actual disease.[38] In the early 18th century, the physician Richard Blackmore considered it to be one of the two most prevalent diseases in England (along with consumption).[38] In 1701, Anne Finch (later, Countess of Winchilsea) had published a Pindaric ode, The Spleen, drawing on her first-hand experiences of an affliction which, at the time, also had a reputation of being a fashionably upper-class disease of the English.[39] Both Blackmore and George Cheyne treated this malady as the male equivalent of "the vapours", while preferring the more learned terms "hypochondriasis" and "hysteria".[38][40][41] In the late 18th century, the German word Spleen came to denote eccentric and hypochondriac tendencies that were thought to be characteristic of English people.[36]
The spleen is one of the many organs that may be included in offal. It is not widely eaten as a principal ingredient, but cow spleen sandwiches are eaten in Sicilian cuisine.[42] Chicken spleen is one of the main ingredients of Jerusalem mixed grill.[43]
Other animals
Laparoscopic view of a horse's spleen (the purple and grey mottled organ)
In cartilaginous and ray-finned fish, the spleen consists primarily of red pulp and is normally somewhat elongated, as it lies inside the serosal lining of the intestine. In many amphibians, especially frogs, it has the more rounded form and there is often a greater quantity of white pulp.[44]
In reptiles, birds, and mammals, white pulp is always relatively plentiful, and in birds and some mammals the spleen is typically rounded, but it adjusts its shape somewhat to the arrangement of the surrounding organs. In most vertebrates, the spleen continues to produce red blood cells throughout life; only in mammals this function is lost in middle-aged adults. Many mammals have tiny spleen-like structures known as haemal nodes throughout the body that are presumed to have the same function as the spleen.[44] The spleens of aquatic mammals differ in some ways from those of fully land-dwelling mammals; in general they are bluish in colour. In cetaceans and manatees they tend to be quite small, but in deep diving pinnipeds, they can be massive, due to their function of storing red blood cells.
Marsupials have y-shaped spleens, and it develops postnatally.[45][46][47][48]
The only vertebrates lacking a spleen are the lampreys and hagfishes (the early-branching Cyclostomata, or jawless fishes). Even in these animals, there is a diffuse layer of haematopoeitic tissue within the gut wall, which has a similar structure to red pulp and is presumed homologous with the spleen of higher vertebrates.[44]
^Liddell, Henry George; Scott, Robert (1940). "σπλήν". In Jones, Henry Stuart; McKenzie, Roderick (eds.). A Greek-English Lexicon. Vol. 2: λ–φώδης (New (9th) ed.). Oxford: Clarendon Press. p. 1628. OCLC13606128 – via Perseus Digital Library.
^Loscalzo, Joseph; Fauci, Anthony S.; Braunwald, Eugene; Dennis L. Kasper; Hauser, Stephen L; Longo, Dan L. (2008). Harrison's principles of internal medicine. McGraw-Hill Medical. ISBN978-0-07-146633-2.
^Chow, Kai Uwe; Luxembourg, Beate; Seifried, Erhard; Bonig, Halvard (2016). "Spleen Size Is Significantly Influenced by Body Height and Sex: Establishment of Normal Values for Spleen Size at US with a Cohort of 1200 Healthy Individuals". Radiology. 279 (1): 306–13. doi:10.1148/radiol.2015150887. ISSN0033-8419. PMID26509293.
^Lodin-Sundström, Angelica; Schagatay, Erika (June 2010). "Spleen contraction during 20 min normobaric hypoxia and 2 min apnea in humans". Aviation, Space, and Environmental Medicine. 8 (6): 545–49. doi:10.3357/ASEM.2682.2010. PMID20540444.
^ abRiva MA, Ferraina F, Paleari A, Lenti MV, Di Sabatino A (2019). "From sadness to stiffness: the spleen's progress". Internal and Emergency Medicine. 14 (5): 739–743. doi:10.1007/s11739-019-02115-2. PMID31152307. S2CID172137672.
^ abcStanley Eric (2002). "Polysemy and synomyny and how these concepts were understood from the eighteenth century onwards in treatises, and applied dictionaries of English". In Coleman J, McDermott A (ed.). Historical dictionaries and historical Dictionary Research: Papers from the international conference on historical lexicography and lexicology, at the University of Leicester, 2002. Germany: Walter de Gruyter. pp. 170–171. ISBN978-3-11-091260-9.
^Rogers KM (1989). "Finch's "Candid Account" vs. Eighteenth–Century Theories of the Spleen". Mosaic: A Journal for the Interdisciplinary Study of Literature. 22 (1): 17–27. ISSN0027-1276. JSTOR24780450.
^Cheyne, George: The English Malady; or, A Treatise of Nervous Diseases of All Kinds, as Spleen, Vapours, Lowness of Spirits, Hypochondriacal and Hysterical Distempers with the Author's Own Case at Large, Dublin, 1733. Facsimile ed., ed. Eric T. Carlson, M.D., 1976, Scholars' Facsimiles & Reprints, ISBN978-0-8201-1281-7
^ abcRomer, Alfred Sherwood; Parsons, Thomas S. (1977). The Vertebrate Body. Philadelphia: Holt-Saunders International. pp. 410–11. ISBN978-0-03-910284-5.
^ Old JM, Selwood L, Deane EM (2004). "A developmental investigation of the liver, bone marrow and spleen of the stripe-faced dunnart (Sminthopsis macroura)". Developmental and Comparative Immunology. 28 (4): 347–355. doi:10.1016/j.dci.2003.08.004.
