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Accessory Bone
An accessory bone or supernumerary bone is a bone that is not normally present in the body, but can be found as a anatomical variation, variant in a significant number of people. It poses a risk of being misdiagnosis, misdiagnosed as bone fractures on radiography. Wrist and hand Os ulnostyloideum The ''os ulnostyloideum'' is an ulnar styloid process that is not fused to the rest of the ulna bone.R. O'Rahilly. ''A survey of carpal and tarsal anomalies.'' J Bone Joint Surg Am. 1953; 35: 626–642 On X-rays, an ''os ulnostyloideum'' is sometimes mistaken for an avulsion fracture of the styloid process. However, the distinction between these is extremely difficult.T.E. Keats, M.W. Anderson. ''Atlas of normal roentgen variants that may simulate disease''. 7th edition, Mosby Inc. 2001 It is alleged that the os ulnostyloideum has a close relationship with or is synonymous with the os triquetrum secundarium. Os centrale The ''os carpi centrale'' (also briefly ''os centrale'') i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fabella With Arrow
The fabella is a small sesamoid bone found in some mammals embedded in the tendon of the lateral head of the gastrocnemius muscle behind the lateral Condyle (anatomy), condyle of the femur. It is an accessory bone, an anatomical variation present in 39% of humans. Rarely, there are two or three of these bones (fabella bi- or tripartita). It can be mistaken for a loose body or osteophyte. The word ''fabella'' is a Latin diminutive of ''faba'' 'bean'. In humans, it is more common in men than women, older individuals compared to younger, and there is high regional variation, with fabellae being most common in people living in Asia and Oceania and least common in people living in North America and Africa. Bilateral cases (one per knee) are more common than unilateral ones (one per individual), and within individual cases, fabellae are equally likely to be present in right or left knees. Taken together, these data suggest the ability to form a fabella may be genetically controlled, b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
African Apes
Homininae (the hominines) is a subfamily of the family Hominidae (hominids). (The Homininae——encompass humans, and are also called "African hominids" or "African apes".) This subfamily includes two tribes, Hominini and Gorillini, both having extant (or living) species as well as extinct species. Tribe Hominini includes: the extant genus ''Homo'', which comprises only one extant species—the modern humans (''Homo'' sapiens), and numerous extinct human species; and the extant genus '' Pan'', which includes two extant species, chimpanzees and bonobos. Tribe Gorillini (gorillas) contains one extant genus, Gorilla, with two extant species, with variants, and one known extinct genus. Alternatively, the genus ''Pan'' is considered by some to belong, instead of to a subtribe Panina, to its own separate tribe, (''so-called'') "Panini"—which would be a third tribe for Homininae. Some classification schemes provide a more comprehensive account of extinct groups—(see section "Ta ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ankle
The ankle, the talocrural region or the jumping bone (informal) is the area where the foot and the leg meet. The ankle includes three joints: the ankle joint proper or talocrural joint, the subtalar joint, and the inferior tibiofibular joint. The movements produced at this joint are dorsiflexion and plantarflexion of the foot. In common usage, the term ankle refers exclusively to the ankle region. In medical terminology, "ankle" (without qualifiers) can refer broadly to the region or specifically to the talocrural joint. The main bones of the ankle region are the talus bone, talus (in the foot), the tibia, and fibula (both in the leg). The talocrural joint is a Synovial joint, synovial hinge joint that connects the distal ends of the tibia and fibula in the lower limb with the proximal end of the talus. The articulation between the tibia and the talus bears more weight than that between the smaller fibula and the talus. Structure Region The ankle region is found at the junction ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Accessory Navicular Bone
An accessory navicular bone is an accessory bone of the foot that occasionally develops abnormally in front of the ankle towards the inside of the foot. This bone may be present in approximately 2-14% of the general population and is usually asymptomatic. When it is symptomatic, surgery may be necessary. Accessory navicular bone may cause a continuous stretch and stress on the tibialis posterior tendon which can progress to chronic disabling pain and may cause tendon rupture or secondary flat foot deformity; when this occurs this condition is commonly known as accessory navicular syndrome. Other conditions which closely mimic the symptoms of an accessory navicular bone include plantar fasciitis, bunions and heel spurs. Classification The Geist classification divides the accessory navicular bones into three types. * Type 1: An os tibiale externum is a 2–3 mm sesamoid bone in the distal posterior tibialis tendon. Usually asymptomatic. * Type 2: Triangular or heart-shaped os ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Metatarsophalangeal
The metatarsophalangeal joints (MTP joints) are the joints between the metatarsal bones of the foot and the proximal bones (proximal phalanges) of the toes. They are analogous to the knuckles of the hand, and are consequently known as toe knuckles in common speech. They are condyloid joints, meaning that an elliptical or rounded surface (of the metatarsal bones) comes close to a shallow cavity (of the proximal phalanges). The region of skin directly below the joints forms the ball of the foot. The ligaments are the plantar and two collateral. Movements The movements permitted in the metatarsophalangeal joints are flexion, extension, abduction, adduction and circumduction. File:The feet of C. H. Unthan, the armless fiddler Wellcome L0034227.jpg, Left: toes adducted (pulled towards the center) and spread (abducted); right, both feet clenched (plantar flexed) File:Footgym rings1.jpg, The upper foot is clenching (plantarflexing) at the MTP joints and at the joints of the to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sesamoid Bone
In anatomy, a sesamoid bone () is a bone embedded within a tendon or a muscle. Its name is derived from the Greek word for 'sesame seed', indicating the small size of most sesamoids. Often, these bones form in response to strain, or can be present as a anatomical variation, normal variant. The patella is the largest sesamoid bone in the body. Sesamoids act like pulleys, providing a smooth surface for tendons to slide over, increasing the tendon's ability to transmit Muscle#Function, muscular forces. Structure Sesamoid bones can be found on joints throughout the human body, including: * In the knee—the patella (within the quadriceps tendon). This is the largest sesamoid bone. * In the hand—two sesamoid bones are commonly found in the Anatomical terms of location#Arms, distal portions of the first metacarpal bone (within the tendons of adductor pollicis and flexor pollicis brevis). There is also commonly a sesamoid bone in distal portions of the second metacarpal bone and fif ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Accessory And Sesamoid Bones Of The Foot - Lateral Projection
Accessory may refer to: * Accessory (legal term), a person who assists a criminal In anatomy * Accessory bone * Accessory breast * Accessory kidney * Accessory muscle * Accessory nucleus, in anatomy, a cranial nerve nucleus * Accessory nerve * Accessory spleen In arts and entertainment * Accessory (band), with members Dirk Steyer and Ivo Lottig * Video game accessory, a piece of hardware used in conjunction with a video game console for playing video games * ''Accessories'' (album), a compilation album from Dutch alternative rock band The Gathering * Accessory, a type of rulebook in ''Dungeons & Dragons'' and other role-playing games Other uses * Fashion accessory, an item used to complement a fashion or style * Accessory suite, a secondary dwelling on a parcel of land * Rental accessories and attachments, accessories used in the rental industry * Cable accessories for connecting and terminating cables * Accessory fruit, in which some of the flesh is derived from ti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ossification Center
An ossification center is a point where ossification of the hyaline cartilage begins. The first step in ossification is that the chondrocytes at this point become hypertrophic and arrange themselves in rows. The matrix in which they are imbedded increases in quantity, so that the cells become further separated from each other. A deposit of calcareous material now takes place in this matrix, between the rows of cells, so that they become separated from each other by longitudinal columns of calcified matrix, presenting a granular and opaque appearance. Here and there the matrix between two cells of the same row also becomes calcified, and transverse bars of calcified substance stretch across from one calcareous column to another. Thus, there are longitudinal groups of the cartilage cells enclosed in oblong cavities, the walls of which are formed of calcified matrix which cuts off all nutrition from the cells; the cells, in consequence, atrophy, leaving spaces called the primary ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Radiopaedia
Radiopaedia is a wiki-based international collaborative educational web resource containing a radiology encyclopedia and imaging case repository. It is currently the largest freely available radiology related resource in the world with more than 50,000 patient cases and over 16,000 reference articles on radiology-related topics. The open edit nature of articles allows radiologists, radiology trainees, radiographers, sonographers, and other healthcare professionals interested in medical imaging to refine most content through time. An editorial board peer reviews all contributions. Background Radiopaedia was started as a past-time project to store radiology notes and cases online by the Australian neuroradiologist Associate Professor Frank Gaillard in December 2005, while he was a radiology resident. Frank previously had tried to print out films but they were bulky to carry. He also experimented with saving digital images on thumb drive or hard drives but found that it was diffi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Accessory Bones Of The Ankle
Accessory may refer to: * Accessory (legal term), a person who assists a criminal In anatomy * Accessory bone * Accessory breast * Accessory kidney * Accessory muscle * Accessory nucleus, in anatomy, a cranial nerve nucleus * Accessory nerve * Accessory spleen In arts and entertainment * Accessory (band), with members Dirk Steyer and Ivo Lottig * Video game accessory, a piece of hardware used in conjunction with a video game console for playing video games * ''Accessories'' (album), a compilation album from Dutch alternative rock band The Gathering * Accessory, a type of rulebook in ''Dungeons & Dragons'' and other role-playing games Other uses * Fashion accessory, an item used to complement a fashion or style * Accessory suite, a secondary dwelling on a parcel of land * Rental accessories and attachments, accessories used in the rental industry * Cable accessories for connecting and terminating cables * Accessory fruit, in which some of the flesh is derived from ti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
