Ischial tuberosity
Ischial tuberosity | |
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Capsule of hip-joint (distended). Posterior aspect. (Ischial tuberosity visible at bottom left.)
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The superficial branches of the internal pudendal artery. (Ischial tuberosity visible at center left.)
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Details | |
Latin | Tuber ischiadicum, tuberositas ischiadica |
Identifiers | |
Dorlands /Elsevier |
t_21/12827506 |
TA | Lua error in Module:Wikidata at line 744: attempt to index field 'wikibase' (a nil value). |
TH | {{#property:P1694}} |
TE | {{#property:P1693}} |
FMA | {{#property:P1402}} |
Anatomical terms of bone
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The ischial tuberosity (or tuberosity of the ischium, tuber ischiadicum), also known informally as the sitz bone, or as a pair the sitting bones)[1] is a large swelling posteriorly on the superior ramus of the ischium. It marks the lateral boundary of the pelvic outlet.
When sitting, the weight is frequently placed upon the ischial tuberosity.[2] The gluteus maximus provides cover in the upright posture, but leaves it free in the seated position.[3]
Divisions
The tuberosity is divided into two portions: a lower, rough, somewhat triangular part, and an upper, smooth, quadrilateral portion.
- The lower portion is subdivided by a prominent longitudinal ridge, passing from base to apex, into two parts:
- The outer gives attachment to the adductor magnus
- The inner to the sacrotuberous ligament
- The upper portion is subdivided into two areas by an oblique ridge, which runs downward and outward:
- From the upper and outer area the semimembranosus arises
- From the lower and inner, the long head of the biceps femoris and the semitendinosus
Additional images
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The Obturator externus.
See also
Notes
References
This article incorporates text in the public domain from the 20th edition of Gray's Anatomy (1918)
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External links
- Anatomy photo:41:st-0204 at the SUNY Downstate Medical Center - "The Female Perineum: Bones"
- Anatomy photo:17:os-0114 at the SUNY Downstate Medical Center - "Major Joints of the Lower Extremity: Hip bone (lateral view)"
- pelvis at The Anatomy Lesson by Wesley Norman (Georgetown University) (pelvisposterior, pelvislateral, pelvisinside)
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