Pelvic Diaphragm

Question 1

Levator Ani

Answer 1

O: pubis, ischial spine, fascia between the above bony regions

I: coccyx + midline around the pelvic organs w/ muscle on opposite side

A: support of the pelvic viscera - especially during increased abdominal pressure

In: branches from S3 and S4

Question 2

Coccygeus

Answer 2

O: ischial spine

I: lower sacrum + upper coccyx

A: pulls coccyx anteriorly, support of pelvic viscera

In: branches from S4 and S5