The ischium is the lowest portion of the girdle, and is the portion which supports the body when in a sitting position.
Of or pertaining to the ischium or hip; ischiac; ischiadic; ischiatic.
In this region the membrane is found to adhere laterally to the rami of the ischium and pubes; whilst along the median perinaeal line the two sacs of which the membrane is composed unite, as in the scrotum, and form an imperfect septum.
When the tuberosity of the left ischium stands well apart from the perinaeal centre, the line of incision, B E, Fig.
The body of the ischium in this case was fractured and a rent in the bladder was caused by a sharp projecting piece of bone.
In females where the body of the ischium is fractured, lacerations of the vagina may be present, and this constitutes a serious complication which usually terminates fatally.
In Pterosauria the ischium is fused with the ilium, and in both pterosaurs and crocodiles the ilium and ischium are the only bones taking part in the formation of the acetabulum.
The anterior part of the plate, representing the pubis, generally remains cartilaginous throughout life; the posterior part representing the ischium is in almost every case well ossified.
In Orycteropus however the ischium does not become united to the vertebral column, and the pubis generally has a strongly developed pectineal process.
The ischium often has a well-marked tuberosity and in Kangaroos the pubis bears a prominent pectineal process on its anterior border close to the acetabulum.
The ilium and ischium agree in their general characters throughout all the various groups of reptiles, but that is not the case with the pubis.
The ischium is broad and extends back parallel to the ilium with which in most birds it fuses posteriorly, further forward the ilio-sciatic foramen separates the two bones.
Each half forms one of the innominate bones, and includes at least three separate elements, a dorsal bone, the ilium, and two ventral bones, the ischium and pubis.
The ilium and ischium do not as in Carinatae unite posteriorly, and enclose a foramen except in very old Rheas and Emeus.
Ventrally in front of the ischium there is a tract of unossified cartilage which is often regarded as the pubis.
In the Dugong it consists on each side of two slender bones, one of which represents the ilium and the other the ischium and pubis; the two bones are placed end to end and are commonly fused together.
The ischium and post-pubis are long slender bones directed backwards parallel to one another, and the pre-pubis is also well developed.
In Elasmobranchs the pelvic girdle consists of a short ventral rod of cartilage representing the ischium and pubis, which does not send up dorsal iliac processes.
Hence in the course of growth the pelvis not only becomes proportionally higher, but it undergoes a rotary movement around the cotyloid axis; this movement has the effect of elevating the pubis and bringing the ischium forward.
When the upper limbs are extended vertically along the sides of the body, the tip of the middle finger reaches the middle point of the thigh, while the wrist coincides with the ischium (hip-bone).
On examination after death, the rami of the ischium were found "little more than half an inch asunder.
It was hard, globular, even on its surface, and occupied the ascending ramus of the ischium and the descending ramus of the pubis, and extended over the obturator foramen.
Vaginal examination discovered a hard and painful tumour, extending from the inner surface of the left ischium nearly to the corresponding point on the opposite side.
The transverse diameter from one tuberosity of the ischium to the other, measures 4.
The pelvis is greatly attached by theischium to the vertebral column.
The sacrum consists of five vertebrae, and the ischium does not articulate with it.
There is a small obturator foramen between the ischium and pubis, which gives passage to the obturator nerve.
The distal ends of the pubis and ischium are close together when first formed, but subsequently separate.
The pubis and ischium of each side unite with each other ventrally, so as completely to enclose the obturator foramen.
In the pelvic girdle the ilium corresponds to the scapula, the ischium to the coracoid, the pubis to the clavicle.
Hence the ilium is a pleurapophysis, the ischiumand pubis are both hæmapophyses.
The ischium in Pedioecetes is wider (in dorsoventral extent), especially posteriorly, than in Tympanuchus.
The obturator foramen is a small oval opening posteroventral to the acetabulum between the ischium and the pubis.
The muscle arises by a wide flat tendon from a narrow line on the lateral surface of the ischium dorsal to the ventral ischiatic tubercle.
In Tympanuchus the posteroventral margin of the ischium is rounded and is free from the pubis, whereas in Pedioecetes it is pointed and fused with the pubis.
The posteroventral corner of pars iliofemoralis is some distance dorsal to the ventral edge of the ischium and, therefore, does not attach to the ischiopubic membrane.
Whereas in the former the thick lateral iliac process has a pronounced overhang with the ventral edge lateral to the ischium (fig.
The muscle arises fleshily from a large area on the lateral surface of the ischium extending ventrally to the origin of M.
The ventral ischiatic tubercle is the angle formed by the ventrally projecting ischium at the point (near its midlength) where the ischium overlaps and lies lateral to (and fused to) the pubis.
The entire origin is from a strongly curved line, the middle part of which attaches to the ventral edge of the ischium posterior to the ventral ischiatic tubercle.
Defn: Of or pertaining to theischium or hip; ischiac; ischiadic; ischiatic.
Defn: Of or pertaining to the ischium and the capsule of the hip joint; as, the ischiocapsular ligament.
A line drawn from the centre of the space between the tuberosity of the ischium or the great trochanter to a corresponding point between the condyles of the femur will give the direction.
In one there was a severe fracture of the ischium and injury of testicle by grape–shot.
A portion of the ascending ramus of the ischium on the right side was driven into the perineum, the soft parts were much injured, and the right testicle was destroyed.
The pelvic arch of some of the Stegocephalia contained a well ossified pubic element, whilst in all other batrachians only the ilium, or the ilium and the ischiumare ossified.
In the Ecaudata the ilium is greatly elongated and the pubis and ischium are flattened, discoidal, and closely applied to their fellows by their inner surfaces; the pelvic girdle looks like a pair of tongs.
In the dog, the cat, and the ox, the semi-tendinosus arises from the tuberosity of the ischium only, as in the human species.
The posterior and external angle of the ischium is rough and prominent; it is the tuberosity of the ischium.
The ischium forms a plate of bone which, in part, closes the external portion of the cavity of the pelvis.
In the horse, on account of the semi-tendinosus ascending to the coccyx, and even to the sacrum, the depression in question does not exist, and the presence of the tuberosity of the ischium is only slightly revealed.
In them the arch is a mere slot, and being formed by the ischium alone, merits the name of the ischial arch.
Sinuses were divided in all directions, and some healed; one, however, remained open, leading towards the gut from near the tuberosity of the ischium on the left side.
The paired ilium is joined to each side of the backbone and projects downward to meet the pubis and ischium at the socket for the head of the thigh bone.
In the order Ornithischia the pubis extends backward along the ischium as it does in the birds.
The pubis forms the front third and the ischium the rear third of this socket.
Y-- the ilium above, the ischium and pubis below, and the acetabulum at the junction of the three.
Secondly, there is the ordinary form of pelvis in which the pubis and ischium usually unite with each other down their length, as in Dimorphodon, but sometimes, as in Pterodactylus dubius, divide immediately below the acetabulum.
There is some difference in the pubis and ischium which is more conspicuous in form than in direction of the bones.
In such a Dinosaur as the American carnivorous Ceratosaurus the two bars of the pubis and ischium remain separate and diverging, and there is no film of bone extending over the interspace between them.
Some follow the Amphibian nomenclature, and unite the ischium and pubis into one bone, which is then termed ischium, when the prepubis is termed the pubis, and regarded as removed from the acetabulum.
The notch between the ischium and pubis is well marked in Pterodactylus longirostris, and better marked in Pterodactylus dubius, Cycnorhamphus Fraasii, and Rhamphorhynchus.
They are unknown in any other existing animals, unless present in Crocodiles, in which ischium and pubis are always undivided.
First, the type of Rhamphorhynchus, in which the pubis and ischium are inclined somewhat backward, and in which the two prepubic bones are triangular, and are often united together to form a transverse bow in front of the pubic region.
The origin is fleshy and is from the ischium and pubis around the edges of this fenestra; none of the fibers arises from the membrane stretched across the fenestra.
The dorsal part arises directly from the ischium along the dorsal edge of the obturator foramen.
Short and thick, this muscle arises directly from the lateral surface of the ischium between the posterior iliac crest and the ischiopubic fenestra.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "ischium" in a variety of sentences. We hope that you will now be able to make sentences using this word.
