Ischial tuberosity
Lua error in Module:Infobox at line 235: malformed pattern (missing ']'). 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
-
Muscles of the gluteal and posterior femoral regions, with ischial tuberosity highlighted in red.
-
Right hip bone. External surface.
-
Right hip bone. Internal surface.
-
Plan of ossification of the hip bone.
-
Diameters of inferior aperture of lesser pelvis (female).
-
Right hip-joint from the front.
-
The Obturator externus.
-
Anterior view of the pelvis with the ischial tuberosity labelled in the lower part of the image
See also
Notes
<templatestyles src="Reflist/styles.css" />
Cite error: Invalid <references> tag; parameter "group" is allowed only.
<references />, or <references group="..." />References
This article incorporates text in the public domain from the 20th edition of Gray's Anatomy (1918)
- Lua error in package.lua at line 80: module 'strict' not found.
- Lua error in package.lua at line 80: module 'strict' not found.
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)
<templatestyles src="Asbox/styles.css"></templatestyles>
 |
This human musculoskeletal system article is a stub. You can help Wikipedia by expanding it. |
