Week 1- A&P of Pelvic Girdle Flashcards
What kind of joint is the sacrococcygeal joint?
Fibrocartilaginous
What is movement at this joint associated with?
- Defecation
- Breathing
- Childbirth
- Positional changes
What purpose does the pubic symphysis serve?
Attachment site for
- Rectus abdominus
- Adductors
- Internal oblique
- Transverse abdominus
- Levator ani
When, if ever, should the pubic symphysis be mobile?
ONLY during pregnancy
Describe the nerve supply of the pelvic floor
- Pudendal nerve branches
- S2-S4
How many layers of pelvic floor muscles are there?
3
Muscles of layer 1 (most superficial)
- Bulbospongiousus
- Bulbocavernousus
- Ischiocavernosus
- Superficial transverse perineal
- Spinchter ani externus
Muscles of layer 2 (middle)
- Deep transverse perineal
- Sphincter urethra
Generally speaking, what function do the muscles of layers 1 and 2 have?
- “Squeeze” for continence
- “Release” for sexual penetration and elimination
Describe the muscle fiber composition of layers 1 and 2
- 70% fast twitch
- 30% slow twitch
What is another name for the front half of the first 2 layers of the pelvic floor?
Urogenital triangle
What is another name for the back half of the first 2 layers of the pelvic floor?
Anorectal triangle
Muscles of layer 3 (deep)
- Levator ani
- Iliococcygeus
- Coccygeus
- Obturator internus
What muscles make up the levator ani?
- Puborectalis
- Pubococcygeus
What function does layer 3 of the pelvic floor serve?
- “Floor of the core”, provides lift
- Increases IAP during contraction
