Tuberosity of the ischium

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Tuberosity of the ischium

Capsule of hip-joint (distended). Posterior aspect. (Tuberosity of ischium visible at bottom left.)

The superficial branches of the internal pudendal artery. (Tuber. ischial. visible at center left.)
Latin	tuber ischiadicum
Gray's	subject #57 235
Dorlands/Elsevier	t_21/12827506

Posteriorly, the superior ramus of the ischium forms a large swelling, the tuberosity of the ischium (or ischial tuberosity).

It marks the lateral boundary of the pelvic outlet.

When sitting, the weight is frequently placed upon the ischial tuberosity.^[1]

1 Divisions
2 See also
3 Additional images
4 References
5 External links

[edit] 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.

[edit] See also

Sitting disability

[edit] Additional images

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.

[edit] References

^ Goossens R, Teeuw R, Snijders C (2005). "Sensitivity for pressure difference on the ischial tuberosity.". Ergonomics 48 (7): 895-902. PMID 16076744.

[edit] External links

SUNY Labs 41:st-0204 - "The Female Perineum: Bones"
SUNY Labs 17:os-0114 - "Major Joints of the Lower Extremity: Hip bone (lateral view)"
Norman/Georgetown pelvis (pelvisposterior, pelvislateral, pelvisinside)

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Pelvis/pelvic cavity: sacrum, coccyx, hip bone