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apex of the bladder below, where it usually becomes much stouter. Lateral to the urachus, and some distance from it (Fig. 965), will be found, in the same fatty tissue, (b) two stouter fibrous cords, the obliterated umbilical arteries (0.T. obliterated hypogastric arteries), forming the plica umbilicalis lateralis dextra and sinistra. Traced upwards, these also

Liver ecome more slender, and pproach the urachus, along ith which they are connected

Epiploic foramen the umbilicus. Below, Lesser omentum. y grow thicker, and can be owed backwards along the

Pancreas Stomach wall of the pelvis to the

Duodenum, ogastric arteries, which

transverse part Omental bursa join. () More laterally

Transverse colon the inferior epigastric Great sac es are seen running upand medially from the

Mesentery of

small intestine lal iliac trunk on each

Greater omentum

- Small intestine hen the anterior abI wall is examined hind, it will be seen iese five structures, Uterus

Rectum e on the front of the im, carry that mem- Urinary bladder wards towards the I cavity in the form ore or less distinct lown as the plica

media, plicæ umterales, and plicæ

respectively. In Fig. 964.—DIAGRAMMATIC MEDIAN Section of FEMALE Body, to

these are found show the peritoneum on vertical tracing. The great sac of the three peritoneal

peritoneum is blue and is represented as being much larger

than in nature ; the bursa omentalis is coloured red; the 1 as the foveæ in

peritoneum in section is shown as a white line : and a white - inguinal pouches arrow is passed through the epiploic foramen from the great sac

into the bursa omentalis.

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guinalis lateralis lies lateral to the inferior epigastric artery, and corresponds to he abdominal inguinal ring. At its bottom is often found a dimple-like depresoneum, indicating the point from which the processus vaginalis passed down, h the descent of the testis. The fovea inguinalis medialis is situated between stric and the obliterated umbilical arteries ; whilst the fovea supravesicalis lies

of the obliterated umbilical artery, namely, between it and the urachus. nferior epigastric artery laterally, the margin of the rectus abdominis muscle inguinal ligament below, there is a small triangular region, called Hesselbach's iterated umbilical artery, in passing upwards, crosses this triangle, dividing it 2 medial part. The middle inguinal fossa corresponds to the lateral division

the medial fossa to its medial division. sa of the peritoneum is seen in this region, just beneath the medial part of the orresponding to the position of the femoral ring, and consequently known as

It may be added that the ductus deferens crosses the lateral part of the fovea bliterated umbilical artery its medial part. The significance of those fosse exion with the applied anatomy of the inguinal and femoral regions.

an plane, above the umbilicus, the peritoneum is carried back from minal wall and diaphragm to the parietal surface of the liver in centic fold, the falciform ligament of the liver (described with the ects the liver to the abdominal wall. This fold lies somewhat to nedian plane, and extends almost as low down as the umbilicus. It consists of two layers of peritoneum, between which, in the lower border of ti fold, runs the round ligament of the liver—the remains of the left umbilical vt of the foetus.

Posterior Wall of the General Peritoneal Cavity.—The peritoneum clothing ti anterior abdominal wall is continued on to the inferior surface of the diaphragu, Thence it is reflected on to the superior surface of the liver, and there the anter.. wall of the great sac becomes continuous with the posterior wall. The peritone on the posterior wall first clothes the superior surface of the liver, then turns rou. its anterior border, and is continued back on the inferior surface as far as the attaci ment of the lesser omentum, where it quits the liver and passes down, as le anterior layer of the lesser omentum, to the stomach and the duodenum.

The line of reflection of the peritoneum from diaphragm to liver is interrupted near the media plane by the falciform ligament. The portion lying to the right of this fold forms the superi layer of the coronary ligament; that to the left of it, the superior layer of the left triangia ligament of the liver.

The extent to which the peritoneum passes uninterruptedly back on the inferior surface of the liver varies according as it is traced at the right, the left, or the middle portion of the liver. 1 clothes the right portion as far back as the inferior edge of the uncovered area of the liver, who it is reflected on to the posterior wall of the abdomen and the superior extremity of the rig kidney (constituting the hepato-renal ligament), as the inferior layer of the coronary ligame: On the left portion it is continued back as far as the posterior border of the left lobe-or erci a little way on to its superior surface—whence it passes to the diaphragm as the inferior lara of the left triangular liganient. The middle region of the under surface it clothes only as far the porta hepatis and the fossa of the ductus venosus; from those the peritoneum is carried dort as the anterior layer of the lesser omentum.

The peritoneum, which passes back on the inferior surface of the diaphragm to the left of the liver, is continued down on the posterior abdominal wall, behind the fundus of the stomach an the spleen, until the left kidney is reached. It covers the superior and lateral part of the kidres and is then carried forwards as the lieno-renal ligament to the spleen, around which it pas ---clothing its renal, phrenic, and gastric surfaces-as far as the hilum (Fig. 966); from that is carried to the stomach as the left layer of the gastro-splenic ligament. Similarly, the inferior layer of the left triangular ligament is continued down on the posterior part of the diaphragm to the æsophagus, the anterior and left sides of which it clothes. It also forms little fold at the left of the æsophagus, known as the gastro-phrenic ligament (see p. 1241 and Fig. 969).

At the right side, the portion of the peritoneum which forms the inferior layer of the coronary ligament is carried down over the right kidney (and inferior part of the supra-renal gland) to the duodenum and right colic flexure, over both of which it passes.

We shall now follow down the peritoneum forming the posterior wall of the general peritoneal cavity-which we have already traced to the stomach-as seer. in a sagittal section (Fig. 964).

Having reached the lesser curvature of the stomach, it passes down over th: front of that organ, clothing it completely as far as the greater curvature. Fron that it descends, and is usually adherent to the transverse colon, forming the anterior layer of the gastro-colic ligament. Thence it passes onwards as th: most anterior fold of the greater omentum, Arrived at the inferior border of tło greater omentum, the membrane returns on itself, and passes upwards towards the transverse colon, forming the most posterior layer of that omentum. After meeting and covering the posterior aspect of the transverse colon (Fig. 964), it is the continued, as the posterior layer of the transverse mesocolon, to the posterior abdominal wall, which it reaches at the anterior border of the pancreas (Fig. 969

From the anterior border of the pancreas it is continued downwards again clothing first the lower surface of the pancreas, then the front of the third portion of the duodenum, and, below that, the posterior abdominal wall. From the latter however, it is soon carried forwards again by the branches of the superior mesen teric vessels passing to the small intestine. Running out along those, it formu. the superior (or, more correctly, the right) layer of the obliquely placed mesentery (Fig. 964): on reaching the small bowel at the border of the mesentery, it invest that tube, giving it its serous coat, and then returns—as the inferior, or left, layer of the mesentery-to the posterior abdominal wall, on which it runs down, covering the great vessels near the median plane, and the psoas major muscle and ureter at each side, to enter the pelvis. The mesentery is described at p. 1208.

Pelvic Peritoneum.-The arrangement of the peritoneum in the pelvis minor

plicated, and is fully described in connexion with the several general account will suffice here.

over the superior aperture all round, it enters the pelvis minor, ls as low as the pelvic floor, across which it passes to the various it invests the pelvic colon completely, and forms a mesentery

for it, as far down as the third sacral vertebra. There the colon proper, and the complete investment of the bowel ceases. f the pelvic colon is approached the two layers of its mesocolon ad when the rectum is reached, they separate, leaving its posterior , whilst the bowel is clothed in front and at the sides. Lower cane leaves the sides, and finally, at a point which is usually about -, see p. 1224) above the anus, it leaves the anterior surface of the e male is carried on to the posterior part of the bladder (here covered Second sacral vertebra

Ending of pelvic mesocolon -iliac joint

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al fossa
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of
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Ureter (cut)
Hypogastric artery
-Obturator nerve

Ureter

Iliacus stric artery Ureter

External iliac artery Paravesical fossa

Ductus deferens
Plica vesicalis transversa

Obliterated umbilical artery
Rectus

Urinary bladder
Pyramidalis

Median umbilical ligament (urachus) Fig. 965.-THE PERITONEUM OF THE PELVIC Cavity. is of a thin male subject aged 60 was sawn across obliquely. Owing to the absence of fat the arious pelvic organs are visible through the peritoneum, though not quite so distinctly as represented ere. The urinary bladder and rectum were both empty and contracted ; the paravesical and pararectal ossæ, as a result, are very well marked.

e seminal vesicles and deferent ducts), forming the floor of the excavatio -vesicalis (recto-vesical pouch), between those organs. It then covers the rior surface of the bladder, and passing off from its sides to the walls of pelvis, constitutes the so-called false ligaments of the bladder. From the k of the bladder it is carried on to the anterior abdominal wall by the middle bilical ligament, thus forming the plica pubovesicalis (O.T. the superior or erior false ligament of the bladder).

In the female (Fig. 964), the peritoneum, on leaving the rectum, passes to the sterior wall of the vagina, the superior portion of which it covers. From that it continued up over the posterior surface and fundus of the uterus, and down on 8 anterior surface as far as the junction of the cervix and body (Fig. 964). Here

passes from the uterus to the bladder, which it partly covers, as in the male, and s then carried on to the anterior abdominal wall. Between the rectum behind, and the uterus and vagina in front, is situated the excavatio rectouterina [cavum Douglasi] (0.T. pouch of Douglas), the entrance of which is limited, on each side, by a fold passing from the cervix of the uterus around the sides of the pouc), towards the rectum; these are the plicæ rectouterinæ [Douglasi] (O.T. folds of Douglas and they contain in their interior the musculi rectouterini (O.T. utero-sacral ligaments), two bands of fibrous tissue with plain muscle fibres intermixed, which pass from the cervix of the uterus, backwards on each side of the rectum, to blend with the connective tissue on the front of the lower part of the sacrum.

Similarly, in front of the uterus, between it and the bladder, is found the much smaller excavatio vesicouterina (utero-vesical pouch). Finally, the peritoneum is prolonged as a wide fold from each margin of the uterus to the side wall of the pelvis, constituting the ligamentum latum uteri (broad ligament of the uterus), within which are contained the uterine tube, the ovary, the ligamentum teres, and other structures (see pp. 1315 et seq.).

When the bladder is empty, there is seen at each side, between it and the pelvic wall, a considerable peritoneal depression—the paravesical fossa (Fig. 965). This fossa is traversed by a peritoneal" fold—the plica vesicalis transversa—which runs transversely laterally from the superior surface of the empty bladder, and, when well marked, passes to the neighbourhood of the abdominal inguinal ring;

Above the bladder, on each side of the middle umbilical ligament, is found the internal inguinal fovea already referred to (p. 1235). Both of these fossæ are practically obliterate by distension of the bladder.

Similarly, there is seen at each side of the empty rectum, on the posterior pelvic wall, a large depression, which may be known as the pararectal fossa (Fig. 965). When the rectum is empty and contracted, these fossæ are occupied by intestine ; during distension, the rectum, increasing in width, expels the intestine and practically obliterates the fossæ.

Transverse Tracing of the Peritoneum.-If the peritoneum is followed transversely around the abdomen, just above the level of the iliac crest (Fig. 968), few difficulties will be encountered. From the anterior abdominal wall it passes round on each side to the back, lining the sides and the posterior wall. Passing medially on the posterior wall, it meets the colon—ascending on the right side, descending on the left-over which it is carried, in each case covering the bowel in front and at the sides only, and leaving the posterior surface bare, as a rule. Sometimes, however, the covering is complete, and a short mesentery is formed. It is next continued medially over the psoas muscles, the ureters, and the great vessels, on the front of which it meets the superior mesenteric artery and vein running downwards to the intestines. From both sides it passes forwards on these vessels, forming the right and left layers of the mesentery; and finally, having reached the intestine, it clothes it completely, and the two portions become continuous on the bowel.

A transverse tracing at a higher level would include the bursa omentalis ; it will, therefore, be well to study this portion of the peritoneal cavity before describing such a tracing.

Bursa Omentalis (O.T. Lesser Sac of the Peritoneum).- The omental bursa, as already pointed out, is a diverticulum of the great sac. It lies behind the stomach and adjacent organs, and communicates with the general cavity by a constricted passage, called the foramen epiploicum (Winslowi]. If the general cavity is compared, as already suggested, to a bag, the anterior layer of which clothes the anterior wall and sides of the abdomen, and the posterior layer covers the viscera lying on the posterior wall, the bursa omentalis would correspond to a pocket lying behind the stomach, lesser omentum and part of the liver, and opening into its cavity by a narrow mouth, on the right side, just below the liver. From this opening the pocket passes to the left behind the lesser omentum and stomach, as far as the spleen, up behind the caudate lobe of the liver, and down behind the stomach and gastro-colic ligament.

As in the case of the general peritoneal cavity, it will, of course, be understood that the two walls of the bursa omentalis and the boundaries of the epiploic foramen are normally in contact. We shall first consider this opening, and then trace the layers of the omental bursa.

Foramen Epiploicum (Winslowi) (Fig. 966).—This, the constricted passage which leads from the general peritoneal cavity into the bursa omentalis, is situated just below and behind the porta hepatis. . It is bounded anteriorly by the right, free

pato-duodenal ligament, passing up from the superior part of

the porta hepatis, and containing between its two layers the c artery, and bile-duct. Posteriorly, lies the inferior vena cava, e, by peritoneum. Above, is placed the caudate process of

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G. 966.-TRANSVERSE SECTION OF ABDOMEN AT LEVEL OF EPIPLOIC FORAMEN.

And below, lies the superior part of the duodenum with the hepatic ning forwards and to the right beneath the foramen, before turning up esser omentum. It should be remembered that, normally, the various of the foramen lie in contact, and that its cavity can only be said to ch when its walls are drawn apart. d the foramen epiploicum is a small portion of the omental bursa

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Fig. 967.-TRANSVERSE SECTION OF ABDOMEN IMMEDIATELY BELOW EPIPLOIU FORAMEN.

ermed the vestibulum bursæ omentalis, lying below the processus caudatus of the caudate lobe of the liver, and above the superior part of the duodenum and the head of the pancreas. The anterior wall of this portion is formed by the hepatoduodenal ligament

, with the bile-duct, hepatic artery, and portal vein. The

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