ischium


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ischium

 [is´ke-um]
the inferior, dorsal portion of the hip bone. See anatomic Table of Bones in the Appendices.

is·chi·um

, gen.

is·chi·i

, pl.

is·chi·a

(is'kē-ŭm, is'kē-ī, is'kē-ă), [TA] Avoid the mispronunciation ish'ē-ŭm.
The lower and posterior part of the hip bone, distinct at birth but later becoming fused with the ilium and pubis; it consists of a body, where it joins the ilium and superior ramus of the pubis to form the acetabulum, and a ramus joining the inferior ramus of the pubis.
Synonym(s): os ischii [TA], ischial bone
[Mod. L. fr. G. ischion, hip]

ischium

(ĭs′kē-əm)
n. pl. is·chia (-kē-ə)
The lowest of the three major bones that constitute each half of the pelvis.

is′chi·al (-əl) adj.

is·chi·um

, pl. ischia (is'kē-ŭm, -ă) [TA]
The lower and posterior part of the hip bone, distinct at birth but later becoming fused with the ilium and pubis; it consists of a body, where it joins the ilium and superior ramus of the pubis to form the acetabulum, and a ramus joining the inferior ramus of the pubis.
Synonym(s): ischial bone.
[Mod. L. fr. G. ischion, hip]

ischium

The lowest of three bones into which the innominate bone, comprising one side of the pelvis, is divided. The ischial tuberosities are the bony prominences on which we normally sit.

ischium

the ventral bone of the PELVIC GIRDLE in vertebrates, bearing the weight of a sitting human.
References in periodicals archive ?
Autotransplantation of a combination of distal and proximal claw segments (dactyl + pollex + ischium) into eye sockets regenerated claws or clawlike structures in four cases (26.7% of surviving crabs, n = 15).
Autotransplantation of proximal segments of claws (ischium + merus/carpus joint) or distal parts of claws (dactyl + pollex) regenerated claws or clawlike structures (11 cases, 21.2% of surviving crabs, n = 52).
Autotransplantation of fourth walking leg tissues (dactyl + ischium + merus/ carpus joint) regenerated one complete walking leg [ILLUSTRATION FOR FIGURE 2I OMITTED] and three incomplete walking legs that contained only distal segments (dactyl or dactyl + manus) of the fourth walking leg.
One mode - regeneration of a complete claw following ecdysis - can occur in autotransplantation of both digits of the claw, the proximal segments of claws (ischium + merus/carpus joint), or a combination of distal and proximal segments of claws (dactyl + pollex + ischium).