1. Bony Pelvis and Pelvic Wall (A. Wang) Flashcards
What is the anatomical position for the innominate?
The position in which the ASIS and anterior pubis are in the same vertical plane.
Wire adults more likely to develop pelvic fractures than children?
Because the pelvis is fused after puberty, but connected with cartilage before that.
Identify the arrows.
What are the four weak points for pelvic fractures?
Pubic rami.
Acetabulum.
Sacroiliac joints.
Iliac ala.
Is the greater pelvis shallower in the female or the male?
It is shallower in the female.
Is the true pelvis narrower and deeper in the male or female?
The true pelvis is narrow and deep in the male – shallow and wide in the female.
Is the pelvic aperture wider in males or females?
The pelvic aperture is wider in females.
How wide is the typical male subpubic angle?
How wide is the typical female subpubic angle?
The male subpubic angle is typically less 70°.
The female subpubic angle is typically greater than 90°
How does the obturator foramina differ in the male and female?
The male obturator foramen is typically round.
The female obturator foramen is typically oval.
Is the acetabulum larger in the male or the female?
The acetabulum is larger in the male.
Is the greater sciatic notch larger in the male or the female?
The greater sciatic notch is larger – around 90° – in the female.
The greater sciatic notch is smaller – around 70° – in the male.
What is the tendinous arch of the levator ani made of?
A thickening of the obturator internus fascia.
What does the tendinous arch of the levator ani separate?
The pelvic region and the peroneal region of the obturator internus.
From medial to lateral, what are the three muscles of the levator ani?
Puborectalis.
Pubococcygeus.
Iliococcygeus.
What portion of the pelvic floor helps promote fecal continence?
The puborectal sling.
What two muscles of the pelvic floor are most prone to tearing during childbirth?
The puborectalis and pubococcygeus muscles.
The ischiorectal fossa can be divided into what two regions?
The urogenital triangle and the anal triangle.
What portion of the anal canal secretes mucus to aid in defecation?
Anal sinuses.
What are the three parts to the external anal sphincter?
Deep, superficial, and subcutaneous.
Which anal sphincter is under voluntary control?
The external anal sphincter.
What is the nerve supply, blood supply, venous supply, and lymphatic drainage above the pectinate line?
Nerves: Inferior Hypogastric Plexus.
Blood: Inferior Mesenteric A.
Veins: Superior Rectal Veins (Portal System).
Lymph: Internal Iliac Lymph Nodes
What is the nerve supply, blood supply, venous drainage, and lymphatic drainage below the pectinate line?
Nerves: Inferior Rectal Nerves (somatic).
Blood: Internal Iliac.
Veins: Inferior Rectal Veins (Systemic).
Lymph: Superficial Inguinal Lymph Nodes.
What is the lymphatic drainage for the superior rectum?
Superior rectum -> pararectal lymph nodes -> sacral lymph nodes -> inferior mesenteric lymph nodes.
What is the lymphatic drainage for the inferior rectum?
Internal iliac lymph nodes.
What is the lymphatic drainage for the anal canal?
Superficial lymph nodes.
