Pelvis Flashcards
What bones make up the os coxae
Pubis, ilium, ishcium
What is the perineum
Inferior floor of pelvic cavity contains external genitalia and openings
What is the false pelvis
Ilium and lower lumbar
Part of abdomen
Sigmoid colon
What is the true pelvis
Pubis, ischium, sacrum
Bounded by inlet and outlet
Contains urine and reproductive organs
What are the differences between male and female pelvis
Women- circular, 80-85 degree pubis angle
Men- heart shaped, 50-60 degree pubis angle
The sacrospinous ligament attaches to what
Sacrum and ischial spine
What exits greater sciatic foramen
Piriformis Superior gluteal n Sciatic n Inferior gluteal n Pudendal n
What exits lesser sciatic foramen
Obturator internus
What enters the lesser sciatic foramen
Pudendal n
Describe the arrangement of the pudendal n in relation to ligaments and sciatic foramen
Exits greater
Under sacrospinous ligament
Enters lesser
Over sacrotuberous
What muscles for the lateral wall of pelvis
Piriformis and obturator internus
What muscles line the internal surface of sacrotuberous ligament
Coccygeus muscle
Function of coccygeus muscle
Form pelvic floor
Support pelvic viscera
Pull coccyx forward after defecation
Function of obturator internus
ER of hip
Function of Piriformis
ER of hip
ABD hip
What makes up Levator ani
Puborectalis
Pubococcygeus
Iliococcygeus
What makes up the pelvic diaphragm
Levator ani and coccygeus
What is the innervation of pelvic diaphragm
Pudendal n S2-4
Injury to pelvic floor and diaphragm can lead to what
Weakness of floor which decreases support
Urinary incontinence
What does the perineum divide
Urogenital triangle and anal triangle
What is the perineal body
Between UG and anal triangle
Center point of perineum
What muscles are in the superficial space of UG triangle
Ischiocavernous
Bulbospongiosus
Superficial transverse peritoneal
What erector tissues are in the superficial UG triangle
Crus of clit or penis
Bulb of clit or penis
Vestibular glands- females
What is in the deep space of the UG triangle
External urethra sphincter muscle
Deep transverse peritoneal
Bulbourethral glands- males
What does the anal triangle contain
Anal aperture
External anal sphincter
Ischio-anal fossae
What divides the superficial and deep UG triangle
Peritoneal membrane
Weakness of what muscle might lead to urinary incontinence
External urethra sphincter muscle
The pudendal n provides motor innervation to what
External urethra sphincter
External anal sphincter and perineal muscle
The pudendal n provides cutaneous innervation to what
Perineum and clitoris/penis
Where is the pudendal canal and what is the contents
Located between the fascia and obturator internus muscle
Contains pudendal n/a/v
What are the 4 branches of the pudendal n
Inferior rectal m/s
Perineal m/s
Dorsal n of penis or clitoris s
Posterior scrotal or labial s
What does the inferior rectal n innervate
External anal sphincter
Skin of anus