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Buttocks
The buttocks (singular: buttock) are two rounded portions of the exterior anatomy of most mammals, located on the posterior of the pelvic region. In humans, the buttocks are located between the lower back and the perineum. They are composed of a layer of exterior skin and underlying subcutaneous fat superimposed on a left and right gluteus maximus and gluteus medius muscles. The two gluteus maximus muscles are the largest muscles in the human body. They are responsible for movements such as straightening the body into the upright (standing) posture when it is bent at the waist; maintaining the body in the upright posture by keeping the hip joints extended; and propelling the body forward via further leg (hip) extension when walking or running. In the seated position, the buttocks bear the weight of the upper body and take that weight off the feet. In many cultures, the buttocks play a role in sexual attraction. Many cultures have also used the buttocks as a primary targe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Intergluteal Cleft
The intergluteal cleft or just gluteal cleft, also known by a number of synonyms, including natal cleft, butt crack, and cluneal cleft, is the groove between the buttocks that runs from just below the sacrum to the perineum, so named because it forms the visible border between the external rounded protrusions of the gluteus maximus muscles. Other names are the ''anal cleft'', ''crena analis'', ''crena interglutealis'', and ''rima ani''. Colloquially the intergluteal cleft is known as ''bum crack'' (UK) or ''butt crack'' (US). The intergluteal cleft is located superior to the anus. There are several disorders that can affect the intergluteal cleft including inverse psoriasis, caudal regression syndrome, and pilonidal disease. See also * Buttock cleavage * Rectum *Anal canal * * *Anatomical terms of location Standard anatomical terms of location are used to unambiguously describe the anatomy of animals, including humans. The terms, typically derived from Latin or Greek r ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Human Anus
In humans, the anus (from Latin ''anus'' meaning "ring", "circle") is the external opening of the rectum, located inside the intergluteal cleft and separated from the genitals by the perineum. Two sphincters control the exit of feces from the body during an act of defecation, which is the primary function of the anus. These are the internal anal sphincter and the external anal sphincter, which are circular muscles that normally maintain constriction of the orifice and which relaxes as required by normal physiological functioning. The inner sphincter is involuntary and the outer is voluntary. It is located behind the perineum which is located behind the vagina or scrotum. In part owing to its exposure to feces, a number of medical conditions may affect the anus such as hemorrhoids. The anus is the site of potential infections and other conditions, including cancer (see Anal cancer). With anal sex, the anus can play a role in sexuality. Attitudes toward anal sex vary, and it i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mooning
Mooning is the act of displaying one's bare buttocks by removing clothing, e.g., by lowering the backside of one's trousers and underpants, usually bending over, and also potentially exposing the genitals. Mooning is used in the English-speaking world to express protest, scorn, disrespect, or for provocation, but mooning can be done for shock value, for fun, as a joke or as a form of exhibitionism. The Māori have a form of mooning known as that is a form of insult. Some jurisdictions regard mooning to be indecent exposure, sometimes depending on the context. Word history ''Moon'' has been a common shape metaphor for the buttocks in English since 1743, and the verb ''to moon'' has meant "to expose to (moon)light" since 1601. As documented by McLaren, "'mooning', or exposing one's butt to shame an enemy ... had a long pedigree in peasant culture" throughout the Middle Ages, and in many nations. "Mooning" is also defined as "wandering idly" and "romantically pining" ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Butt
Butt may refer to: * Figurative or literal ''blunt ends'': ** Butt joint, a woodworking joinery technique ** Butt splice connector, a type of Crimp connection#Simple crimp connectors, crimp electrical connector ** Buttstock or butt, the back part of a rifle or other firearm ** Headbutt or butt, (implicitly blunt) blow administered with the head ** Buttocks ** Cigarette butt ** Boston butt or pork butt, a shoulder cut of pork * Metonym for cigarette * Measurement and storage of liquids: ** Butt (unit), a measure of volume ** Butt, an English_wine_cask_units#butt, English wine cask size ** "Water Butt" a rainwater tank *Archery butt, practice target * Surnames: ** Butt (surname) ** Bhat, a surname in India and Pakistan, also spelled as Butt * Titled works: ** Butt (magazine), ''Butt'' (magazine) ** ''The Butt'', a 2008 novel by Will Self **''Der Butt'', German title of ''The Flounder'' (1977), Günter Grass novel ** "Butt Butt", a song by Monrose from ''Temptation (Monrose album), ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Superior Cluneal Nerves
The superior cluneal nerves are pure sensory nerves that innervate the skin of the upper part of the buttocks. They are the terminal ends of the L1-L3 spinal nerve dorsal rami lateral branches.Waldman SD. Atlas of Uncommon Pain Syndromes. 3rd ed. Philadelphia, PA: Saunders/Elsevier; 2014. They are one of three different types of cluneal nerves (middle and inferior cluneal nerves being the other two). Dysfunction of the superior cluneal nerves is often due to entrapment as the nerves cross the iliac crest – this can result in numbness, tingling or pain in the low back and upper buttocks region. Superior cluneal nerve dysfunction is a clinical diagnosis that can be supported by diagnostic nerve blocks. Anatomy The superior cluneal nerves are a group of nerves that were first described by Maigne et al. in 1989 as a source of low back pain. These nerves are grouped as the superior cluneal nerves due to their trajectory over the iliac spine, as opposed to the lateral, medial and in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Medial Cluneal Nerves
The medial clunial nerves innervate the skin of the buttocks closest to the midline of the body. Those nerves arise from the posterior rami of sacral spinal nerves A spinal nerve is a mixed nerve, which carries motor, sensory, and autonomic signals between the spinal cord and the body. In the human body there are 31 pairs of spinal nerves, one on each side of the vertebral column. These are grouped into th ... (S1, S2, and S3). Additional images Image:Gray801.png, Diagram of the distribution of the cutaneous branches of the posterior divisions of the spinal nerves. Image:Gray803.png, The posterior divisions of the sacral nerves. External links * * - "Superficial Anatomy of the Lower Extremity: Cutaneous Nerves of the Posterior Aspect of the Lower Extremity" Spinal nerves Buttocks {{neuroanatomy-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Inferior Cluneal Nerves
The inferior clunial nerves (also called gluteal branches of posterior femoral cutaneous nerve) innervate the skin of the lower part of the buttocks. They arise as branches of the posterior cutaneous nerve of the thigh The posterior cutaneous nerve of the thigh (also called the posterior femoral cutaneous nerve) is a sensory nerve in the thigh. It supplies the skin of the posterior surface of the thigh, leg, buttock, and also the perineum. Structure The .... References External links * * - "Superficial Anatomy of the Lower Extremity: Cutaneous Nerves of the Posterior Aspect of the Lower Extremity" Nerves of the lower limb and lower torso Buttocks {{Neuroanatomy-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Superior Gluteal Artery
The superior gluteal artery is the largest and final branch of the internal iliac artery. It is the continuation of the posterior division of that vessel. It is a short artery which runs backward between the lumbosacral trunk and the first sacral nerve. It divides into a superficial and a deep branch after passing out of the pelvis above the upper border of the piriformis muscle. Within the pelvis, it gives off branches to the iliacus, piriformis, and obturator internus muscles. Just previous to exiting the pelvic cavity, it also gives off a nutrient artery which enters the ilium. Structure The superior gluteal artery is the largest and final branch of the internal iliac artery. It branches from the posterior division of the internal iliac artery. It exits the pelvis through the greater sciatic foramen. It divides into a superficial and a deep branch. Superficial branch The superficial branch passes over the piriformis muscle. It enters the deep surface of the gluteus maximus mus ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Linea Aspera
The linea aspera ( la, rough line) is a ridge of roughened surface on the posterior surface of the shaft of the femur. It is the site of attachments of muscles and the intermuscular septum. Its margins diverge above and below. The linea aspera is a prominent longitudinal ridge or crest, on the middle third of the bone, presenting a medial and a lateral lip, and a narrow rough, intermediate line. It is an important insertion point for the adductors and the lateral and medial intermuscular septa that divides the thigh into three compartments. The tension generated by muscle attached to the bones is responsible for the formation of the ridges. Structure Above Above, the linea aspera is prolonged by three ridges. * The lateral ridge is very rough, and runs almost vertically upward to the base of the greater trochanter. It is termed the gluteal tuberosity, and gives attachment to part of the gluteus maximus: its upper part is often elongated into a roughened crest, on which a more ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Femur
The femur (; ), or thigh bone, is the proximal bone of the hindlimb in tetrapod vertebrates. The head of the femur articulates with the acetabulum in the pelvic bone forming the hip joint, while the distal part of the femur articulates with the tibia (shinbone) and patella (kneecap), forming the knee joint. By most measures the two (left and right) femurs are the strongest bones of the body, and in humans, the largest and thickest. Structure The femur is the only bone in the upper leg. The two femurs converge medially toward the knees, where they articulate with the proximal ends of the tibiae. The angle of convergence of the femora is a major factor in determining the femoral-tibial angle. Human females have thicker pelvic bones, causing their femora to converge more than in males. In the condition ''genu valgum'' (knock knee) the femurs converge so much that the knees touch one another. The opposite extreme is ''genu varum'' (bow-leggedness). In the general pop ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Subcutaneous Fat
The subcutaneous tissue (), also called the hypodermis, hypoderm (), subcutis, superficial fascia, is the lowermost layer of the integumentary system in vertebrates. The types of cells found in the layer are fibroblasts, adipose cells, and macrophages. The subcutaneous tissue is derived from the mesoderm, but unlike the dermis, it is not derived from the mesoderm's dermatome region. It consists primarily of loose connective tissue, and contains larger blood vessels and nerves than those found in the dermis. It is a major site of fat storage in the body. In arthropods, a hypodermis can refer to an epidermal layer of cells that secretes the chitinous cuticle. The term also refers to a layer of cells lying immediately below the epidermis of plants. Structure * Fibrous bands anchoring the skin to the deep fascia * Collagen and elastin fibers attaching it to the dermis * Fat is absent from the eyelids, clitoris, penis, much of pinna, and scrotum * Blood vessels on route to th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Quadruped
Quadrupedalism is a form of locomotion where four limbs are used to bear weight and move around. An animal or machine that usually maintains a four-legged posture and moves using all four limbs is said to be a quadruped (from Latin ''quattuor'' for "four", and ''pes'', ''pedis'' for "foot"). Quadruped animals are found among both vertebrates and invertebrates. Quadrupeds vs. tetrapods Although the words ‘quadruped’ and ‘tetrapod’ are both derived from terms meaning ‘four-footed’, they have distinct meanings. A tetrapod is any member of the taxonomic unit Tetrapoda (which is defined by descent from a specific four-limbed ancestor), whereas a quadruped actually uses four limbs for locomotion. Not all tetrapods are quadrupeds and not all entities that could be described as ‘quadrupedal’ are tetrapods. This last meaning includes certain artificial objects; almost all quadruped ''organisms'' are tetrapods (with the exception of some raptorial arthropods adapte ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
