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Pelvis > Bony Structure > Flashcards

Bony Structure Flashcards

1
Q

Which bones make up the bony pelvis

A

Two hip bones (innominate bones)

  • Ilium
  • ischium
  • pubis

Sacrum (5 fused vertebrae)

Coccyx - 4 fused vertebrae

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2
Q

Where do the three parts of the Innominate Bone meet

A

Acetabulum

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3
Q

When does fusion happen of the innominate bone

A

puberty

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4
Q

What bones make up the pelvic girdle

A

Hib bones and sacrum

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5
Q

What are the layers of the pelvic walls formed by

A

Bones of bony pelvis
Ligaments
Muscles
Fascia

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6
Q

Describe the boundaries of the pelvic cavity

A

Sup:

  • Pelvic Inlet
  • Inf. aspect of abdominal cavity

Inf:
-Pelvic Floor

Ant:

  • Pubic bones
  • Pubic Symphysis

Post:

  • Sacrum and Coccyx
  • Adjacent ilia

Lat:

  • Hip bones
  • Obturator Foramen
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7
Q

Describe the pelvic inlet

A

Defined by an oblique plane

Extends from promontory to the superior aspect of pubic symphysis

Surrounded by pelvic brim

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8
Q

What makes up the pelvic brim

A
  • Sacral Promontory and Ala
  • Arcuate line of ilium
  • Pectineal line of pubic (pecten pubis)
  • Pubic crest
  • Superior edge of pubic symphysis
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9
Q

What is the pelvic outlet bounded by

A
  • Tip of coccyx **
  • Sacrotuberous ligaments
  • Inferior Ischiopubic rami and ischial tuberosities
  • Inferior edge of pubic symphysis
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10
Q

What is the pelvic cavity divided into? Describe.

A

True (minor) pelvic cavity:

  • Between pelvic inlet and outlet
  • Contains the pelvic viscera

Fase (major) pelvic cavity:

  • Lies above pelvic brim
  • Between iliac fossa
  • Contains part part of ileum and sigmoid colon
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11
Q

What are the joints of the pelvis

A

Lumbosacral joints

Sacroiliac joint

Pubic Symphysis

Sacrococcygeal Joint

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12
Q

Describe the Lumbosacral joints

A
  • Between L5 and S1

- Simply the intervertebral joint

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13
Q

Describe the Sacroiliac joint

A
  • Between sacrum and ileum
  • Atypical synovial joint
  • Movement limited
  • Stabilized by sacroiliac ligaments
  • Roughened surfaces
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14
Q

Describe the Pubic Symphysis

A
  • Union of bodies of right and left pubic bones
  • Secondary carilaginous joint
  • Fibrocartilaginous interpubic disc in joint
    = Relaxin acts on the joint during pregnancy
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15
Q

Describe the Sacrococcygeal Joint

A

Secondary cartilaginous joint

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16
Q

What are the attachments of the ligaments of the pelvis

A

Sacrotuberous lig.:

  • Sacrum
  • Ischial Tuberosity

Sacrospinous lig.:
-Sacrum and coccyx
- Ischial Spine
THIN LIGAMENT

Iliolumbar lig.:

  • L5
  • Iliac crest
17
Q

What passes through the Greater Sciatic Foramina

A

Suprapiriform foramen:

  • superior gluteal vessels
  • superior gluteal nerve

Infrapiriform foramen:

  • inferior gluteal vessels
  • internal pudendal vessels
  • nerves of the sacral plexus
  • –Pudendal nerve
  • –nerve to Obturator internus
  • –Posterior femoral cutaneous nerve
  • –Sciatic nerve
  • –Inferior gluteal nerve
  • –nerve to Quadratus femoris

POPS IQ - mneumonia for nerves in Infrapiriform foramen (in capitals)

18
Q

What passes through the Lesser Sciatic Foramina

A

P: pudendal nerve
I: internal pudendal artery and vein
N: nerve to obturator internus
TO: tendon of obturator internus

19
Q

What are the sex differences in males and females with the bony pelvis

A

Pubic arch:

  • Male:Narrow
  • Female: Wide

Subpubic arch:

  • Male: Acute
  • Female: Obtuse

Pelvic Outlet:

  • Male: Smaller
  • Female: Bigger

Greater Pelvis

  • Male: Deeper
  • Female: Shallow

Obturator Foramen:

  • Male: Round
  • Female: Oval

Ischial tuberosities:

  • Male: Closer
  • Female: Wide apart

Pelvic inlet:

  • Male: Heart shaped
  • Female: Oval

Pelvis:

  • Male: Narrow
  • Female: Broader

Please, some people give out in public places

20
Q

What are the types of pelvis? Which is common in each sex?

A

Gynecoid: Females
Android: Males
Platypelloid: Rare in both

Antropoid: Ancestors

21
Q

What are the different pelvic measurements

A

Conjugate diameter

  • Superior border of pubic symphysis
  • Sacral promotory

Transverse diameter:
-Widest distance of pelvic inlet

Oblique diameter:

  • Sacroiliac joint
  • Contralateral iliopectineal line
22
Q

What are the clinical points of the bony pelvis

A

Pelvic Fractures:

Decubitus Ulcers (pressure sores/bedsores to skin and underlying tissue due to bony prominence)

Pelvis (9 decks)

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