Muscles and their actions upper core Flashcards

Rectus abdominus
- front of torso
- crosses lumbar and thoracis vertebrae
- bends torso forward (flexion)
- tilts pelvis backwards (posterior tilt)
- origin pubis
- insertion- cartilage of 5,6,7th ribs and base of sternum
- 3 strong bands in teh middle made of connective tissues are part of the ab aponeurosis. They run horizontally though to reinforce structure
- center is the linea alba (white line)
rectus abdominus
- front of torso
- crosses lumbar and thoracis vertebrae
- bends torso forward (flexion)
- tilts pelvis backwards (posterior tilt)
- origin pubis
- insertion- cartilage of 5,6,7th ribs and base of sternum
- 3 strong bands in teh middle made of connective tissues are part of the ab aponeurosis. They run horizontally though to reinforce structure
- center is the linea alba (white line)


External obliques
- sides of torso
- cross invertebral lumbar and thoracic vertebrae
- pulls torso to side (lateral flexion)
- turns torso (rotation)
- bends torso (forward flexion)
- origin lower 8 ribs
- insertion iliac crest via abdominal aponeurosis to linea alba
- most superficial of the 3 layers at the side
- diagonal sloping fibers pull in different directions
- active roll in wakling and running
External Obliques
- sides of torso
- cross invertebral lumbar and thoracic vertebrae
- pulls torso to side (lateral flexion)
- turns torso (rotation)
- bends torso (forward flexion)
- origin lower 8 ribs
- insertion iliac crest via abdominal aponeurosis to linea alba
- most superficial of the 3 layers at the side
- diagonal sloping fibers pull in different directions
- active roll in wakling and running


Internal Obliques
- sides of torso
- lumbar and thoracic vertebral joints
- rotation of torso
- bends torso forward flexion
- origin thoacolumbar fascia, iliac crest and inguinal ligament
- insert cartilage of lower 3 or 4 ribs and via abdominal aponeurosis to linea alba
- under external obliques
- fibers slope doqn and forward for a cross cross pattern to torso muscles
Internal Obliques
- sides of torso
- lumbar and thoracic vertebral joints
- rotation of torso
- bends torso forward flexion
- origin thoacolumbar fascia, iliac crest and inguinal ligament
- insert cartilage of lower 3 or 4 ribs and via abdominal aponeurosis to linea alba
- under external obliques
- fibers slope doqn and forward for a cross cross pattern to torso muscles


Transverse abdominus
- side of torso
- crosses lumbar intervertebral joints
- compresses abdominal contents
- origin- cartilage of lower 6 ribs, thoracolumbar fascia, iliac crest and inguinal ligament
- inserts via abdominal aponeuriosis to linea alba
- helps stabilize lumbar spine because it holds everything in
Transverse abdominus
- side of torso
- crosses lumbar intervertebral joints
- compresses abdominal contents
- origin- cartilage of lower 6 ribs, thoracolumbar fascia, iliac crest and inguinal ligament
- inserts via abdominal aponeuriosis to linea alba
- helps stabilize lumbar spine because it holds everything i

aponeurosis
broad fiberous sheet that convers ab area
-rectus ab is buried in it

Erector Spinae
- on back, either side of vertebral column
- crosses invertebral joints
- extension of spine
- lateral flexion
- origin- sacrum and iliac crest, ribs
- inserts ribs, transverse process of vertebrae and cranium
- 3 groups
Erector Spinae
- on back, either side of vertebral column
- crosses invertebral joints
- extension of spine
- lateral flexion
- origin- sacrum and iliac crest, ribs
- inserts ribs, transverse process of vertebrae and cranium
- 3 groups

3 groups of erector spinae
iliocostalis, longissimus, spinalis
Iliocostalis
cervsis, thoracis, lumbar
longissimus
thoracis, cervicis

Multifidus
- back, either side of vertebral column
- crosses all invertebral joints
- spine extension
- lateral flexion
- torso rotation
- origin sacrum and mamillary/transverse process
- insertion spinous process
Multifidus
- back, either side of vertebral column
- crosses all invertebral joints
- spine extension
- lateral flexion
- torso rotation
- origin sacrum and mamillary/transverse process
- insertion spinous process


Quadratus lumborum
- either side of vertebral column
- crosses lumbar intervertebral joints
- pulls torso to side (lateral flexion)
- origin iliac crest and iliolumbar ligament
- insertion tranvserse process of upper 4 lumbar and lower bit of 12th rib
- stabilize lumbar spine
Quadratus lumborum
- either side of vertebral column
- crosses lumbar intervertebral joints
- pulls torso to side (lateral flexion)
- origin iliac crest and iliolumbar ligament
- insertion tranvserse process of upper 4 lumbar and lower bit of 12th rib
- stabilize lumbar spine


Pelvic floor muscles
- support pelvic contents
- continence
- origin ischium, pubis
- insertion, sacrum and coccyx
- levator ani and coccygeus muscles
Pelvic Floor Muscles
- support pelvic contents
- continence
- origin ischium, pubis
- insertion, sacrum and coccyx
- levator ani and coccygeus muscles

Diaphragm
- internal at bottom of ribcage, separates thoracic from abdominal cavity
- increases volume of thoracic cavity during inspiration
- origin inner surface of lower ribs
- insertion central tendon

Diaphragm
- internal at bottom of ribcage, separates thoracic from abdominal cavity
- increases volume of thoracic cavity during inspiration
- origin inner surface of lower ribs
- insertion central tendon

External Intercostals
- between each of ribs
- lift ribs upwards increasing volume of thoracic cavity
- origin- inferior border of each rib
- insert superios border of rib above
- supplement action of diaphragm
External Intercostals
- between each of ribs
- lift ribs upwards increasing volume of thoracic cavity
- origin- inferior border of each rib
- insert superios border of rib above
- supplement action of diaphragm


Internal Intercostals
-between each of ribs
draws ribs down, decreasing volume during expiration
- origin-superior border of rib
- insertion- inferior border of rib above
Internal intercostals
-between each of ribs
draws ribs down, decreasing volume during expiration
- origin-superior border of rib
- insertion- inferior border of rib above