noun, plural is·chi·a [is-kee-uh]. /ˈɪs ki ə/. Anatomy.
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Origin of ischium
OTHER WORDS FROM ischiumis·chi·ad·ic [is-kee-ad-ik], /ˌɪs kiˈæd ɪk/, is·chi·at·ic [is-kee-at-ik], /ˌɪs kiˈæt ɪk/, is·chi·al, adjective
Words nearby ischium
What is ischial tuberosity?
Ischial tuberosity is the name for the part of the pelvis that supports a person while sitting.
How to pronounce ischial tuberosity[ is-kee-uhl too-buh–ros-i-tee ]
Where did ischial tuberosity come from?
Ischial tuberosity is an anatomical term for the V-shaped bone at the bottom of the pelvis that makes contact with a surface when a person is sitting down, hence their common name of sit bone or sitting bones.
Forming one of the main parts of the pelvis, the ischial tuberosity is the attachment site for a series of ligaments and muscles, notably the hamstrings, which support the body while sitting. It is located directly beneath the ischial spine (the very bottom of your spine near the hip bones) and, when standing, is covered by the gluteus maximus (the butt muscles).
Emerging in the 1800s, ischial is the adjective form for ischium, a 17th-century anatomical term generally used for the “bones on which the body rests when sitting.” Tuberosity indicates a slight ridge or roundness on the surface of the bone—think protuberance—where muscles attach. Also appearing in the 17th century, tuberosity comes from the Latin base, tuber, literally meaning “bump” or “swelling.”
Ischial tuberosity is typically due to an inflammation of the surrounding muscles. The cause of this pain usually stems from repetitive movements or positions, such as sitting for too long or from overextending muscles through excessive exercise.
The Western yoga community commonly calls ischial tuberosity pain “yoga butt.” Yoga involves many forward bends, which can overextend the hamstrings and lead to strains around the ischial tuberosity, a concern among very flexible yoga practitioners. Remedies include rest and the immediate halt of any activities. Severe pain, of course, should always be diagnosed by a certified physician.
How to use the term ischial tuberosity
Ischial tuberosity typically comes up in technical contexts, used by anatomical scientists and medical professionals, especially orthopedic doctors. Physical therapists and sports-medicine professionals, as well as their patients, also use ischial tuberosity in their practice.
Since the ischial tuberosity projects on both sides of the pelvis, some people refer to them together as the ischial tuberosities.
In colloquial contexts, as noted, people refer to the ischial tuberosity as the sit bone(s), especially when speaking to little kids, as in “Sit down on your sit bones, please.”
More examples of ischial tuberosity:
“If you place your hands behind your knee, you can feel the hamstring attachments as firm, bone-like tendons — one on the outside and two on the inside of the knee. On the other end, the hamstrings also attach to the ischial tuberosity (sitting bones) of the pelvis.”
—Eva Norlyk Smith, HuffPost, December 2017
This content is not meant to be a formal definition of this term. Rather, it is an informal summary that seeks to provide supplemental information and context important to know or keep in mind about the term’s history, meaning, and usage.
Example sentences from the Web for ischium
The area of origin extends to the posterior edge of the ischium.Myology and Serology of the Avian Family Fringillidae|William B. Stallcup
The ischium forms a plate of bone which, in part, closes the external portion of the cavity of the pelvis.Artistic Anatomy of Animals|douard Cuyer
The body of the ischium in this case was fractured and a rent in the bladder was caused by a sharp projecting piece of bone.Lameness of the Horse|John Victor Lacroix
Both pubis and ischium contribute to the symphysis which is often very long.The Vertebrate Skeleton|Sidney H. Reynolds
It lies within the pelvis, a short way anterior to the brim, and above the symphysis of the ischium.The Dog|Dinks, Mayhew, and Hutchinson