Pelvic Cavity Flashcards
Pelvic cavity
Greater/false inlet: iliac crest, inguinal ligament, pubic symphysis
Lesser/true inlet: sacral promontory, margin of Ala, arcuate line to pubic symphysis
Pelvic floor: muscular diaphragm
Pelvic wall: bones and ligaments
Male vs. Female pelvis
Inlet- heart shape : circle
Intrapubic angle- acute : obtuse
Shape- cone : cylinder
Pelvic wall bones
Innominate and sacrum
Pelvic wall joints
Sacroiliac joint (posterior) pubic symphysis (anterior)
Pelvic wall ligaments
Sacrotuberous and sacrospinous
Pelvic wall muscles (2)
Piriformis and obturator internus
Orientation of innominate bones
4 SIS: transverse plane (S2)
ASIS and pubic symphysis: coronal place
Pelvic outlets around wall
Greater (sup and inf)/lesser sciatic foreman
Obturator canal
Gap between inguinal lig and pelvic bone
Greater sciatic foreman
Piriformis divides it into superior and inferior
Bones: ilium and ischium
Ligaments: posterior sacroiliac ligament, sacrotuberus lig, sacrospines lig
Lesser sciatic foreman
Obturator internus muscle turning as anatomic landment imaging
Bone: ischium
Ligaments: sacroiliac, sacrospinous, sacrotuberous
Ventral rami of spinal nerve roots
Lumbosacral trunk: L4-L5
Sacral spinal nerves: S1-S3
Sacral plexus ventral divisions (tpp)
Tibial nerve L4-S3
Pudendal nerve S2 - S4
Pelvic splanchnic nerve S2 - S4
Greater sciatic foreman crossing structures
Superior: superior gluteal nav
Inferior: sciatic nerve; pudendal/ inferior gluteal nav, posterior femoral cutaneous nerve, nerve to small hip ERs
Lesser sciatic foreman structures
Pudendal nav
S2, S3, S4
Internal pudendal artery
Pelvic diaphragm innervation
Pudendal nerve (S2-S4)
Pelvic diaphragm parts (2)
- Levator ani: puborectalis, pubococcygeus, iliococcygeus
- Coccygeus ligament
Male pelvic cavity
Urogenital system: urinary bladder, prostate gland, seminal vesicle
Digestive system: rectum
Female pelvic cavity
Urogenital: urinary bladder, uterus, ovaries
Digestive: rectum
Peritoneum in pelvic cavity: male
Proximal 1/3 of rectum and anterior surface of 2nd 1/3 of rectum
Superior surface of urinary bladder
Rectovesical pouch
Peritoneal cavity in pelvis: female
Proximal 2/3 of anterior surface of rectum
Superior surface of urinary bladder
Most of uterus (intraperitoneal) and posterior surface of the ovary
Vesicouterine pouch and rectouterine pouch (pouch of Douglas)
Urinary bladder: orientation/anatomy
Suspended by the median umbilical ligament (urachus)
Anteroinferior to parietal peritoneum
***Parietal peritoneum not fixed to anterior abdominal wall
Urinary bladder: inside surface (2)
Smooth area: triangular (trigone), from opening of ureters to the internal urethral orifice
Corrugated area: detrusor muscles
Urinary bladder
Bladder and male genital system
Posterior inferior: prostate gland, walnut size, hypertrophy w/ aging
Posterior: seminal vesicle + ductus deferens to ampulla = ejaculatory duct
Function: nutrition support, neutralizing acidic environment
Uterus: components
Uterine tube, body, cervix
Uterine tube parts
Uterus:
Uterus positioning
Normal:
Abnormal
Clinical importance: cervical prolapse,
Ovary
Primary retroperitoneal
Connected to uterine body medically
Laterally connected to one of the longest fimbria from the fimbriae of uterine tube
Ovary: function
Initiates meiosis and releases secondary oocyte for fertilization
Development of embryo and fetus
End Erie
Uterus and ovary ligaments
Broad ligament:
1. Mesos
Uterus and vagina innervation
Anterior 1/3 of vagina: somatic only, pudendal nerve S2 -S4
Post
Rectum
Distal 1/3 : Primary retroperitoneal
Distal rectum forms a straight angle
Anus
Pectinate line
Internal an external sphincters
Fecal continence
Pectinate line
Columnar - squamous junction
Lymph drainage in anus
Above pectinate line
Below
Anus innervation
Perineum: triangles (2)
Urethra: female
Very short, equal to males membranous part, increased infection risk
Urethra: male (4)
Sexual differences
Urinary bladder phases
A. Filling/storage phase
B. Voiding/ micturition phase
Bladder: filling phase
Bladder: voiding phase
Types of incontinence
Stress, urge, mixed (stress and urge), functional, overflow, transient (infection or medication)
External genitalia: skeletal muscles
Ischiocaernousus and bulbospongiosus
Innervated by pudendal nerve
External genitalia: erectile tissues
Corpus cavernosum” crus
Corpus