Quiz 6 - Lower Axial Muscles Flashcards
oblique and rectus muscles
scalenes
scalenes
elevate ribs and/or flex neck (together), laterally flex neck and rotates neck
- O: cervical vertebrae
- I: sup. surface of 1st and 2nd rib
(anterior, middle, posterior)
external intercostals
elevates ribs (during inhalation)
- O: inf. border of ribs
- I: sup. border of inf. ribs
internal intercostals
depresses ribs (during exhalation)
- O: sup. border of ribs
- I: inf. border of sup. ribs
external oblique
compresses abdomen, depresses ribs, flexes laterally or rotates vertebrae to opposite side
- O: ribs
- I: aponeuroses extending to linea alba
internal oblique
same as external oblique and rotates vertebrae to same side
- O: iliac crest and thoracolumbar fascia
- I: ribs, linea alba, pubis
transverse abdominis
compresses abdomen
- O: rib cartilages, iliac crest, thoracolumbar fascia
- I: linea alba pubis
rectus abdominis
depresses ribs, flexes vertebrae, compresses abdomen
- O: pubis
- I: rib cartilages and xiphoid process
diaphragm
contraction expands thoracic cavity
- O: xiphoid process, ribs, lumbar vertebrae
- I: central tendon sheet
urogenital diaphragm
- supports the organs of the pelvic cavity
- flex the joints of the sacrum and coccyx
- control the movement of material through the urethra and anus
external urethral sphincter
- male - closes urethra, compresses prostate and bulb-urethral glands
- female - closes urethra, compresses vagina
deep transverse perineal
- male - strengthens pelvic floor
- female - strengthens pelvic floor
pelvic diaphragm
- levator ani
- external anal sphincter
- coccygeus
levator ani
- pubococcygeus - tenses pelvic floor, supports pelvic organs, elevates and retracts anus
- illiococcygeus - same as above
external anal sphincter
closes anal opening
