Actions - Trunk Muscles Flashcards
coccygeus
suports and compresses posterior pelvic floor
levator ani
supports pelvic viscera and compresses rectum and vagina
intercostal (external)
elevates ribs
intercostal (internal and innermost)
depresses ribs
transversus thoracis
depresses ribs
cremaster
elevates testicles
diaphragm
inspiration (negative thoracic pressure)
external oblique
flexion and rotation of the trunk, compression of abdominal cavity
internal oblique
flexion and rotation of the trunk, compression of abdominal cavity
quadratus lumborum
extension and lateral flexion of trunk, fixes 12th rib during respiration
rectus abdominis
flexion of trunk, compression of abdominal cavity
transversus abdominis
compression of abdominal cavity
iliacus
flexes thigh, stabilizes hip joint
psoas
flexes thigh, stabilizes hip joint
piriformis
abducts and laterally rotates thigh
obturator internus
laterally rotates thigh
bulbospongiosus
in male empties urethra, maintains erection and contracts during ejaculation; in female constricts vaginal orifice and contributes to erection of clitoris
ischiocavernosus
compresses crus during erection
sphincter ani externus
closes anal canal and fixes perineal body
sphincter urethrae (male)
compresses urethra
compressor urethrae (female)
compresses urethra
sphincter urethrovaginalis (female)
compresses urethra and vagina
deep transverse perineus (male)
fixes perineal body
superficial transverse perineus
fixes perineal body