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IMF-079-01-0001-en	Why should disruption of the pelvic ring at one point prompt a search for a second disruption?	The two hip bones, sacrum and coccyx form a closed ring, so a break at one point is usually accompanied by injury elsewhere in the ring.	Integrated Medical Foundations; chapter 79, TTS module 1; https://theisegoria.github.io/medical-textbook/integrated-medical-foundations-expanded-english.md; module SHA256 at export: 9c9d535ecc3a354d904f9cb1ce4a8a860f759a97720d5b1a3a8dcd7a0cf1fe14; editorial review pending	imf lang::en chapter::079 module::079-01 review::pending
IMF-079-01-0002-en	What distinguishes the boundaries of the pelvic inlet from those of the pelvic outlet?	The inlet lies in the plane of the pelvic brim from sacral promontory to symphysis, whereas the outlet is bounded by pubic arch, ischial tuberosities, sacrotuberous ligaments and coccyx.	Integrated Medical Foundations; chapter 79, TTS module 1; https://theisegoria.github.io/medical-textbook/integrated-medical-foundations-expanded-english.md; module SHA256 at export: 9c9d535ecc3a354d904f9cb1ce4a8a860f759a97720d5b1a3a8dcd7a0cf1fe14; editorial review pending	imf lang::en chapter::079 module::079-01 review::pending
IMF-079-01-0003-en	What two roles do the sacrospinous and sacrotuberous ligaments play in the bony pelvis?	They convert the greater and lesser sciatic notches into foramina, and they resist rotation of the sacrum.	Integrated Medical Foundations; chapter 79, TTS module 1; https://theisegoria.github.io/medical-textbook/integrated-medical-foundations-expanded-english.md; module SHA256 at export: 9c9d535ecc3a354d904f9cb1ce4a8a860f759a97720d5b1a3a8dcd7a0cf1fe14; editorial review pending	imf lang::en chapter::079 module::079-01 review::pending
IMF-079-01-0004-en	How does body weight interact with the structure of the sacroiliac joint to keep it stable?	Weight drives the sacrum between the ilia like a wedge, and the strong posterior syndesmosis with interosseous and other ligaments resists separation.	Integrated Medical Foundations; chapter 79, TTS module 1; https://theisegoria.github.io/medical-textbook/integrated-medical-foundations-expanded-english.md; module SHA256 at export: 9c9d535ecc3a354d904f9cb1ce4a8a860f759a97720d5b1a3a8dcd7a0cf1fe14; editorial review pending	imf lang::en chapter::079 module::079-01 review::pending
IMF-079-01-0005-en	How do anteroposterior compression, lateral compression and vertical shear differ in the pelvic-ring injury they cause?	Anteroposterior compression opens the symphysis and sacroiliac structures, lateral compression buckles or internally rotates a hemipelvis, and vertical shear disrupts posterior support.	Integrated Medical Foundations; chapter 79, TTS module 1; https://theisegoria.github.io/medical-textbook/integrated-medical-foundations-expanded-english.md; module SHA256 at export: 9c9d535ecc3a354d904f9cb1ce4a8a860f759a97720d5b1a3a8dcd7a0cf1fe14; editorial review pending	imf lang::en chapter::079 module::079-01 review::pending
IMF-079-01-0006-en	Why does a pelvic-ring injury demand assessment beyond the skeleton?	Bleeding arises from cancellous bone, venous plexuses and arteries into a large potential space, and urethra, bladder, rectum, lumbosacral plexus and limb vessels share the same ring.	Integrated Medical Foundations; chapter 79, TTS module 1; https://theisegoria.github.io/medical-textbook/integrated-medical-foundations-expanded-english.md; module SHA256 at export: 9c9d535ecc3a354d904f9cb1ce4a8a860f759a97720d5b1a3a8dcd7a0cf1fe14; editorial review pending	imf lang::en chapter::079 module::079-01 review::pending
IMF-079-01-0007-en	What distinguishes the usual pregnancy-associated change at the pubic symphysis from traumatic separation?	Pregnancy-associated widening of this secondary cartilaginous joint is usually modest, whereas traumatic or pathological separation destabilises the anterior ring.	Integrated Medical Foundations; chapter 79, TTS module 1; https://theisegoria.github.io/medical-textbook/integrated-medical-foundations-expanded-english.md; module SHA256 at export: 9c9d535ecc3a354d904f9cb1ce4a8a860f759a97720d5b1a3a8dcd7a0cf1fe14; editorial review pending	imf lang::en chapter::079 module::079-01 review::pending
IMF-079-01-0008-en	Why can living birth mechanics not be predicted from one external pelvic measurement or pelvic type?	Besides bony dimensions, fetal head moulding, position, soft tissue, uterine force and dynamic joint movement all influence childbirth.	Integrated Medical Foundations; chapter 79, TTS module 1; https://theisegoria.github.io/medical-textbook/integrated-medical-foundations-expanded-english.md; module SHA256 at export: 9c9d535ecc3a354d904f9cb1ce4a8a860f759a97720d5b1a3a8dcd7a0cf1fe14; editorial review pending	imf lang::en chapter::079 module::079-01 review::pending
IMF-079-01-0009-en	Why should pelvic anatomy be established by imaging or examination rather than inferred from a person's sex or identity?	Average sex-associated differences in inlet, subpubic angle, sacrum and ischial spines overlap widely, and age, ancestry, stature, activity and nutrition also contribute.	Integrated Medical Foundations; chapter 79, TTS module 1; https://theisegoria.github.io/medical-textbook/integrated-medical-foundations-expanded-english.md; module SHA256 at export: 9c9d535ecc3a354d904f9cb1ce4a8a860f759a97720d5b1a3a8dcd7a0cf1fe14; editorial review pending	imf lang::en chapter::079 module::079-01 review::pending
IMF-079-01-0010-en	Why is the diagonal conjugate used in examination instead of the obstetric conjugate?	The obstetric conjugate, the shortest inlet distance from promontory to posterior symphysis, cannot be measured directly, whereas the diagonal conjugate reaches the inferior pubic border and estimates it.	Integrated Medical Foundations; chapter 79, TTS module 1; https://theisegoria.github.io/medical-textbook/integrated-medical-foundations-expanded-english.md; module SHA256 at export: 9c9d535ecc3a354d904f9cb1ce4a8a860f759a97720d5b1a3a8dcd7a0cf1fe14; editorial review pending	imf lang::en chapter::079 module::079-01 review::pending
IMF-079-01-0011-en	How do the obturator nerve and vessels pass from the pelvis to the medial thigh?	They travel through the obturator canal at the superior margin of the obturator membrane in the lateral pelvic wall.	Integrated Medical Foundations; chapter 79, TTS module 1; https://theisegoria.github.io/medical-textbook/integrated-medical-foundations-expanded-english.md; module SHA256 at export: 9c9d535ecc3a354d904f9cb1ce4a8a860f759a97720d5b1a3a8dcd7a0cf1fe14; editorial review pending	imf lang::en chapter::079 module::079-01 review::pending
IMF-079-01-0012-en	How does piriformis organise the structures leaving the greater sciatic foramen?	It divides the foramen, so superior gluteal vessels and nerve pass above it, while sciatic, inferior gluteal, pudendal and posterior femoral cutaneous structures pass below.	Integrated Medical Foundations; chapter 79, TTS module 1; https://theisegoria.github.io/medical-textbook/integrated-medical-foundations-expanded-english.md; module SHA256 at export: 9c9d535ecc3a354d904f9cb1ce4a8a860f759a97720d5b1a3a8dcd7a0cf1fe14; editorial review pending	imf lang::en chapter::079 module::079-01 review::pending
IMF-079-01-0013-en	Why does the course of the pudendal nerve both enable a nerve block and make it vulnerable in childbirth?	It leaves the greater sciatic foramen below piriformis and curves closely around the ischial spine and sacrospinous ligament before entering the lesser sciatic foramen to the perineum.	Integrated Medical Foundations; chapter 79, TTS module 1; https://theisegoria.github.io/medical-textbook/integrated-medical-foundations-expanded-english.md; module SHA256 at export: 9c9d535ecc3a354d904f9cb1ce4a8a860f759a97720d5b1a3a8dcd7a0cf1fe14; editorial review pending	imf lang::en chapter::079 module::079-01 review::pending
IMF-079-01-0014-en	How does puborectalis contribute to both faecal continence and defecation?	As a U-shaped sling around the anorectal junction it maintains the anorectal angle at rest, and it relaxes during defecation.	Integrated Medical Foundations; chapter 79, TTS module 1; https://theisegoria.github.io/medical-textbook/integrated-medical-foundations-expanded-english.md; module SHA256 at export: 9c9d535ecc3a354d904f9cb1ce4a8a860f759a97720d5b1a3a8dcd7a0cf1fe14; editorial review pending	imf lang::en chapter::079 module::079-01 review::pending
IMF-079-01-0015-en	Why is the pelvic-floor hiatus described as a necessary weak region?	It must transmit the urethra, vagina when present and anorectal canal, and its dimensions and support change with pregnancy, delivery, age, connective tissue and loading.	Integrated Medical Foundations; chapter 79, TTS module 1; https://theisegoria.github.io/medical-textbook/integrated-medical-foundations-expanded-english.md; module SHA256 at export: 9c9d535ecc3a354d904f9cb1ce4a8a860f759a97720d5b1a3a8dcd7a0cf1fe14; editorial review pending	imf lang::en chapter::079 module::079-01 review::pending
IMF-079-01-0016-en	How can pelvic-floor dysfunction arise from too much muscle tone as well as too little?	Excess tone can cause pain and voiding difficulty, while weakness can contribute to prolapse or incontinence.	Integrated Medical Foundations; chapter 79, TTS module 1; https://theisegoria.github.io/medical-textbook/integrated-medical-foundations-expanded-english.md; module SHA256 at export: 9c9d535ecc3a354d904f9cb1ce4a8a860f759a97720d5b1a3a8dcd7a0cf1fe14; editorial review pending	imf lang::en chapter::079 module::079-01 review::pending
IMF-079-01-0017-en	Why are the loose connective-tissue planes of the pelvis clinically double-edged?	They permit organ filling and surgical dissection, but the same planes transmit vessels and allow disease to spread.	Integrated Medical Foundations; chapter 79, TTS module 1; https://theisegoria.github.io/medical-textbook/integrated-medical-foundations-expanded-english.md; module SHA256 at export: 9c9d535ecc3a354d904f9cb1ce4a8a860f759a97720d5b1a3a8dcd7a0cf1fe14; editorial review pending	imf lang::en chapter::079 module::079-01 review::pending
IMF-079-01-0018-en	Which structures support the cervix and upper vagina, as distinct from the bladder neck?	Cardinal or transverse cervical and uterosacral ligament complexes support cervix and upper vagina, whereas puboprostatic or pubovesical ligaments support bladder neck and proximal urethra.	Integrated Medical Foundations; chapter 79, TTS module 1; https://theisegoria.github.io/medical-textbook/integrated-medical-foundations-expanded-english.md; module SHA256 at export: 9c9d535ecc3a354d904f9cb1ce4a8a860f759a97720d5b1a3a8dcd7a0cf1fe14; editorial review pending	imf lang::en chapter::079 module::079-01 review::pending
IMF-079-01-0019-en	Why can injury to the perineal body compromise continence?	It is the central fibromuscular node receiving bulbospongiosus, external anal sphincter, transverse perineal and levator attachments, so injury weakens posterior vaginal wall and continence support.	Integrated Medical Foundations; chapter 79, TTS module 1; https://theisegoria.github.io/medical-textbook/integrated-medical-foundations-expanded-english.md; module SHA256 at export: 9c9d535ecc3a354d904f9cb1ce4a8a860f759a97720d5b1a3a8dcd7a0cf1fe14; editorial review pending	imf lang::en chapter::079 module::079-01 review::pending
IMF-079-01-0020-en	Why must prolapse repair address integrated support rather than one isolated defect?	Prolapse reflects failure across muscles, fascia, connective attachments, nerves and loading, and visible descent does not map perfectly to symptoms.	Integrated Medical Foundations; chapter 79, TTS module 1; https://theisegoria.github.io/medical-textbook/integrated-medical-foundations-expanded-english.md; module SHA256 at export: 9c9d535ecc3a354d904f9cb1ce4a8a860f759a97720d5b1a3a8dcd7a0cf1fe14; editorial review pending	imf lang::en chapter::079 module::079-01 review::pending
IMF-079-01-0021-en	Why does an obturator vessel arising from the inferior epigastric create a bleeding risk?	It crosses the superior pubic ramus as the corona mortis, where it can be injured.	Integrated Medical Foundations; chapter 79, TTS module 1; https://theisegoria.github.io/medical-textbook/integrated-medical-foundations-expanded-english.md; module SHA256 at export: 9c9d535ecc3a354d904f9cb1ce4a8a860f759a97720d5b1a3a8dcd7a0cf1fe14; editorial review pending	imf lang::en chapter::079 module::079-01 review::pending
IMF-079-01-0022-en	Why can pelvic venous bleeding be diffuse and hard to control?	Pelvic veins form valveless plexuses that collapse poorly and retract into tissue.	Integrated Medical Foundations; chapter 79, TTS module 1; https://theisegoria.github.io/medical-textbook/integrated-medical-foundations-expanded-english.md; module SHA256 at export: 9c9d535ecc3a354d904f9cb1ce4a8a860f759a97720d5b1a3a8dcd7a0cf1fe14; editorial review pending	imf lang::en chapter::079 module::079-01 review::pending
IMF-079-01-0023-en	What distinguishes the pelvic splanchnic nerves from the pudendal nerve, although both arise from S2 to S4?	Pelvic splanchnic nerves are parasympathetic autonomic fibres joining the inferior hypogastric plexuses, whereas the pudendal nerve is somatic, supplying external sphincters, perineal muscles and sensation.	Integrated Medical Foundations; chapter 79, TTS module 1; https://theisegoria.github.io/medical-textbook/integrated-medical-foundations-expanded-english.md; module SHA256 at export: 9c9d535ecc3a354d904f9cb1ce4a8a860f759a97720d5b1a3a8dcd7a0cf1fe14; editorial review pending	imf lang::en chapter::079 module::079-01 review::pending
IMF-079-01-0024-en	How does the pelvic pain line predict the spinal level to which visceral pain travels?	Pain from organs above the line often follows sympathetics to lower thoracic or upper lumbar levels, and below it many follow parasympathetics to sacral levels, though pathways overlap.	Integrated Medical Foundations; chapter 79, TTS module 1; https://theisegoria.github.io/medical-textbook/integrated-medical-foundations-expanded-english.md; module SHA256 at export: 9c9d535ecc3a354d904f9cb1ce4a8a860f759a97720d5b1a3a8dcd7a0cf1fe14; editorial review pending	imf lang::en chapter::079 module::079-01 review::pending