Pelvis I Flashcards

1
Q

What are the bones of the pelvic girdle

A

Os Coxae (ilium, ischium, pubis)
Sacrum
Coccyx

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2
Q

What are the regions of the ilium

A

ASIS
PSIS
Iliac crest
Iliac Fossa

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3
Q

What are the regions of the ischium

A

greater sciatic notch, ischial spine, lesser sciatic notch, ischial tuberosity, ischial ramus

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4
Q

How does the sacrum connect to the ilium

A

Sacroiliac joints

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5
Q

How are the ischium and pubis connected

A

Superior pubic ramus, inferior pubic ramus, ischiopubic ramus, ischial ramus

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6
Q

What is found at the base of the sacrum

A

L5/S1 level is the sacral promontory

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7
Q

What forms the pubic arch

A

ischiopubic rami connecting

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8
Q

Where do the nerves enter the pelvis

A

They go through the posterior foramina and exit through the anterior foramina of the sacrum

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9
Q

How many vertebrae are in the Coccyx

A

4 fused vertebrae that connect to the sacral apex (S5) at the sacrococcygeal joint

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10
Q

What are the ligaments of the pelvis

A

Anterior sacroiliac ligament
Posterior sacroiliac ligament
Interosseous ligament

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11
Q

What is the sacrospinous ligament

A

connects the sacrum to the ischial spine (more anterior)

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12
Q

What is the sacrotuberous ligament

A

Connects the sacrum to the ischial tuberosity (more posterior)

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13
Q

How can you tell a female from a male pelvis

A
  • Females have a wider pelvic inlet than males (wider ischial tuberosities and ischial spines) (round in women, heart shaped in men)
  • Females have a wider subpubic angle (>80 degrees) than men (<70 degrees)
  • Sacral promontory protrudes less in females than in men
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14
Q

What muscles form the posterior and lateral walls of the pelvis

A
Piriformis (through greater sciatic foramen)
Obturator interns (lateral wall)
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15
Q

What sits on the anterior aspect of Piriformis

A

sacral plexus

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16
Q

What is the purpose of ligaments

A

To help resist rotation

17
Q

What are the muscles of the pelvic floor

A
Levator ani (pubococcygeus + iliococcygeus)
Coccygeus (internal surface of sacrospinous
18
Q

What does the pelvic diaphragm separate

A

Superior: pelvic viscera
Inferior: perineum

19
Q

What are the regions of Pubococcygeus

A

Pubovaginalis
Puboprostaticus
Puborectalis

20
Q

What provides major innervation of the pelvic muscles

A

Piriformis: sacral plexus
Obturator interns: sacral plexus
Pelvic diaphragm: sacral and lumbar plexus

21
Q

What can weakness in the pelvic diaphragm lead to

A

urinary incontinence, bowel incontinence, prolapse of the pelvic viscera

22
Q

What provides venous drainage to the pelvis

A

veins named similarly to the arteries. As well as multiple venous plexuses

23
Q

What are the venous plexuses

A
Prostatic plexus
Uterine plexus
Vaginal plexus
Rectal plexus
Vesical plexus
24
Q

What is the flow of lymph drainage in the pelvis

A

internal iliac nodes–> common iliac nodes–> lumbar lymph–>chyle cistern–> thoracic duct

25
Q

What is the only exception to pelvic lymph drainage, and what is the flow

A

ovaries and testis drain directly to the lumbar lymph nodes–>chyle cistern–> thoracic duct

26
Q

What is the primary blood supply to the pelvis, perineum, and gluteal region

A

internal iliac arteries

27
Q

What are the major branches off the internal iliac artery

A
Superior gluteal
Inferior gluteal
Internal Pudendal (inferior rectal)
Umbilical (superior vesical)
Obturator
Inferior vesical
Middle Rectal
Uterine
Vaginal
28
Q

Which artery has potential for injury during inguinal hernia repairs

A

Aberrant obturator artery (20% of people have it) that arises from inferior epigastric artery

29
Q

Where does the aberrant obturator artery run

A

over the superior pubic ramus

30
Q

How many degrees is the pelvic inlet tilted from the horizontal plane

A

55 degrees

31
Q

How many degrees is the pelvic outlet tilted from the horizontal plane

A

15 degrees