Tuberosity of the ischium
| Bone: 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, tuberositas ischiadica |
| Gray's | subject #57 235 |
Posteriorly, the superior ramus of the ischium forms a large swelling, the tuberosity of the ischium (or ischial tuberosity or Tuber ischiadicum in Latin, also known as the sitz bone,[1] or as a pair the sitting bones).
It marks the lateral boundary of the pelvic outlet.
When sitting, the weight is frequently placed upon the ischial tuberosity.[2] The gluteus maximus covers it in the upright posture, but leaves it free in the seated position.[3]
Contents |
Divisions [edit]
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 [edit]
-
Muscles of the gluteal and posterior femoral regions, with tuberosity of the ischium 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 [edit]
Notes [edit]
- ^ Sills, Franklyn (2004). Craniosacral Biodynamics: The Primal Midline and the Organization of the Body (revised, illustrated ed.). Berkeley, CA: North Atlantic Books. p. 99. ISBN 1-55643-390-5.
- ^ Goossens (2005), pp 895-982
- ^ Platzer (2004), p 236
References [edit]
- Goossens R, Teeuw R, Snijders C (2005). "Sensitivity for pressure difference on the ischial tuberosity". Ergonomics 48 (7): 895–902. doi:10.1080/00140130500123647. PMID 16076744.
- Platzer, Werner (2004). Color Atlas of Human Anatomy, Vol. 1: Locomotor System (5th ed.). Thieme. ISBN 3-13-533305-1.
This article incorporates text from a public domain edition of Gray's Anatomy.
External links [edit]
- SUNY Labs 41:st-0204 - "The Female Perineum: Bones"
- SUNY Labs 17:os-0114 - "Major Joints of the Lower Extremity: Hip bone (lateral view)"
- pelvis at The Anatomy Lesson by Wesley Norman (Georgetown University) (pelvisposterior, pelvislateral, pelvisinside)
|
|||||||||||||||||||||||||||||||||||||||||||
 |
This musculoskeletal system article is a stub. You can help Wikipedia by expanding it. |
