Lecture: muscles of the pelvic floor and perineum

Composed of: Levator Ani, Coccygeus

• Functions:
• 1. Seals the inferior outlet of the pelvis
• 2, supports pelvic organs
• 3. lifts pelvix floor to help release feces
• 4. Resists increased intra-abdominal pressure

origin: extensive liear origin inside pelcis from pubis to ischial spine

Insertion: inner surface of coccyx, levator ani or opposite side, and in part into the structures that penetrate it

• Action: supports and maintains position of pelvic viscera (resists downward thrust), lifts the anam canal during pooping
• 

origin: spine of ischium

insertion: sacrum and coccyx

• action: supports pelvic viscera
• 

Origin: ischial rami

Insertion: midline central tendon of perineum; some fibers into vaginal wall in femals

• Action: supports pelvic organs
• 

Origin: isciopubuc rami

Insertion: midline raphe

• Action: constricts urethra
• 

origin: ischial tuberosities

insertion: crus of the corpova cavernose of main penis or female clitoris

• action: retards venous drainage and maintains erection of the penis or clitoris
• 

Origin: central tendon of perineum and midline raphe of penis

Insertion: anteriorly into coropora cavernosa of penis or clitoris

• action: empties maile urethra; assists in errection of penis or clitoris
• 

Origin: ischial tuberosity

Insertion: central tendon of perineum

• action: stabilizes and strengthens midline tendon of perineum
•