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Maternal pelvis:- , The pelvis is the area of the body below the abdomen that is located between the hip bones and contains the bladder and rectum. In females, it also contains the vagina, cervix, uterus, fallopian tubes, and ovaries.

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FUNCTION OF PELVIS:, Adapted for child bearing, Allow movement of the body, Permits the person to sit and stand, Transmits the weight of the trunk to the leg.

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Articulated pelvis is composed of four bones:- , Two innominate bone, Sacrum, Coccyx

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TYPES:- The pelvis is anatomically divided into, False pelvis:- Above brim, True pelvis:- Below brim to birth canal, PARTS OF PELVIS, INLET/BRIM, CAVITY, OUTLET, i). INLET, As the inlet is the brim of the pelvis, Round shape

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Bony landmark:-, 1.upper border of symphysis pubis, 2.pubic crests, 3.pubic tubercle, 4.upper border of the superior pubic rami, 5.iliopectineal eminences, 6.iliopectineal line, 7.sacroiliac joints, 8.alae of the sacrum, 9.sacral promontory

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Diameters:-, Anterior posterior diameters, Transverse diameters, Oblique diameters.

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1. Anatomical Antero posterior diameters (True conjugate), 11 cm. from the tip of the sacral promontory to the upper border of the symphysis pubis, Obstetric conjugate, 10.5 cm. from the tip of the sacral promontory to the most bulging point on the back of symphysis pubis which is about 1c.m below its upper border., Diagonal conjugate, 12.5 cm. from the tip of sacral promontory to the lower border of symphysis pubis

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2. Anatomical transverse diameters , 13cm between the farthest two points on the iliopectineal lines., It is the largest diameter in the pelvis, 3. Right oblique diameter 12 cm. from the right sacroiliac joint to the left iliopectineal eminence., Left oblique diameter 12 cm. from the left sacroiliac joint to the right iliopectineal eminence.

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CAVITY:- , Round shape, Diameters:, Anteroposterior 12c.m from the mid point on the posterior surface of the symphysis pubis to the junction of 2nd and 3rd sacral vertebrae., Transverse 12c.m it cannot be precisely measured as the points lie over the soft tissues covering the Sacro sciatic notches and obturator foramina., Oblique 12cm.

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PELVIC OUTLET:- , Diamond shape, Anatomical anteroposterior diameter 11c.m from the tip of the coccyx to the lower border of the symphysis pubis., Obstetric anteroposterior diameter 13c.m from the tip of the sacrum to the lower border of symphysis pubis as the coccyx moves backwards during the second stage of labour., Transverse diameters:- , Bi-tuberous diameter 11c.m between the inner aspects of the ischial tuberosities., Bi-spinous diameter 10.5 cm. between the tips of ischial spines.

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IN THE ERECT POSTURE THE PELVIS IS TILTED FORWARD 55 DEGREE OR MORE., LIGAMENT- SACROSPINOUS . SACROTUBEROUS