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PELVIS I: BONES AND MUSCLES. Introduction--why is pelvis so hard? Bony structures of the pelvis Muscles of the pelvis--attaching the legs for upright living The floor of the pelvis. Why is the pelvis hard--#1 upright. Pelvic tilt or how we got to be upright

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pelvis i bones and muscles

PELVIS I: BONES AND MUSCLES

Introduction--why is pelvis so hard?

Bony structures of the pelvis

Muscles of the pelvis--attaching the

legs for upright living

The floor of the pelvis

why is the pelvis hard 1 upright
Why is the pelvis hard--#1 upright
  • Pelvic tilt or how we got to be upright
    • Compare with quadruped (cat for instance)
  • Bowl concept
    • pelvis spills forward
    • Hernia
    • “beer belly”
    • In human minor pelvis is behind (posterior) to guts and abdominal cavity

Frolich, Human Anatomy, Pelvis I

human pelvis still has quadruped orientation
Human pelvis still has quadruped orientation

Frolich, Human Anatomy, Pelvis I

why is the pelvis hard 2 fig leafs
Why is the pelvis hard #2 (fig leafs)
  • “Private parts” don’t uncover except in most intimate setting (or medical setting!)
  • Not comfortable seeing or talking about (except jokes)
  • Now serious-many medical issues
  • Realize and confront, not dehumanize--develop professional manner and language--starts with anatomy

Frolich, Human Anatomy, Pelvis I

bony structure of the pelvis
MAIN STRUCTURES

Hip bone (innominate, os coxae)--fusion of

Ilium (“hips”)

Ischium (“rear”)

Pubis (anterior midline)

Sacrum and coccyx

Acetabulum

Femur--head, neck, greater trochanter

HOLES

False and true pelvis (major, minor pelvis)

Pelvic inlet, pelvic outlet

Sacrotuberous ligament

Sacrospinous ligament

Greater, lesser sciatic foramen

Obturator foramen

Bony structure of the pelvis

Frolich, Human Anatomy, Pelvis I

muscles of the pelvis attaching legs for upright posture
Muscles of the pelvis--attaching legs for upright posture
  • Iliopsoas (from abdomen)
  • Gluteus maximus (smaller in cat)
  • Gluteus minimus (bigger in cat)
  • Lateral rotators (not important in cat)

Frolich, Human Anatomy, Pelvis I

muscle tables example
Muscle tables--example

Frolich, Human Anatomy, Pelvis I

female male
Female Male
  • Cavity is broad, shallow
  • Pelvic inlet oval + outlet round
  • Bones are lighter, thinner
  • Pubic angle larger
  • Coccyx more flexible, straighter
  • Ischial tuberosities shorter, more everted
  • Cavity is narrow, deep
  • Smaller inlet + outlet
  • Bones heavier, thicker
  • Pubic angle more acute
  • Coccyx less flexible, more curved
  • Ischial tuberosities longer, face more medially

Frolich, Human Anatomy, Pelvis I

the pelvic floor
MAIN STRUCTURES

Ischial tuberosity

Pubic symphysis

Coccyx

Sacrotuberous ligament

Ischipubic ramus

Perineal body

Anus

External urethral opening

Vaginal opening

MUSCULAR FLOOR AND SPHINCHTERS

transverse perineal m.

Anal triangle and urogentical triangle

Levator ani m.

Urogenital diaphragm

The pelvic floor

EXTERNAL GENITALIA

  • Clitoris or penis
  • Ischiocavernosus m.
  • Bulbospongiosus m. (and labia majorum)

Frolich, Human Anatomy, Pelvis I

slide13

M&M, Fig. 26.14

Frolich, Human Anatomy, Pelvis I

blood supply to the pelvis and lower limb
Blood supply to the pelvis and lower limb
  • Aorta ends by splitting into right,left common iliac aa.
  • Each common iliac splits into internal and external iliac aa.
  • External iliac passes under inguinal ligament to lower limb
  • Internal iliac a. enters pelvis and supplies muscles, viscera
  • Umbilical a. comes off of internal iliac in fetus

M&M, Fig. 19.14

Frolich, Human Anatomy, Pelvis I

branches of internal iliac a
Branches of internal iliac a.

SOMATIC BRANCHES--TO MUSCLES

  • Gluteal aa. (to gluteal mm.)
  • Internal pudendal (to pelvic floor, external genitalia)

VISCERAL BRANCHES

  • Vesicular aa. (to bladder)
  • Uterine (to uterus)
  • Middle rectal (to rectum)

M&M, Fig. 19.15

Frolich, Human Anatomy, Pelvis I

coming next

Coming Next

Pelvis II:

Function Taboos