muscles origin,insertion,action Flashcards
rhomboid major description
-the larger of the 2 rhomboids
- is a skeletal muscle which connects the scapular to the vertebrae of the spinal column
-it sits deep underneath the trapezius muscle
-it runs inferolaterally (below and to one side)
rhomboid major origin
-the spinous processes of vertebrae t2 t3 t4 and t5
-ie t2 to t5
rhomboid major insertion
inserts into the medial (inner) border of the scapular (shoulder blade) below the spine of scapular
rhomboid major action
-it supports to position of the scapular (shoulder blade) holding it onto the ribcage
-moves the scapular (inferior angle) backwards and inwards towards the spine
rhomboid minor description
-smaller of the 2 rhomboids
-run inferlaterally
rhomboid minor origins
nuchal ligament
and spinous processors c7 to t1
7th cervical to 1st thoratic
rhomboid minor insertion
inserts into the medial (toward spine side) or the spine of scapular
rhomboid minor action
same as rhomboid major
-supports the positioning of the scapular holding it to the rib cage
-moves the scapular backwards and upwards
trapezius muscles
-flat triangular muscle of the upper back shoulders and neck
-3 parts upper middle and lower with different muscle fibre directions
traps origins
-it has mutiple because its so big
-occipital bone
-logamentum nuchae
-spinous processors t1 through to t12
traps insersion
-the lateral (outer) third of the clavical
as well as the acromion (point that meets the clavical) and spine of scapular
traps action
-rotation and retraction of the scapular
-elevation and depression of the scapular
-extends the neck
-stabilises the shoulder
erector spinae
not just 1 muscle but a group of muscles and tendons running the whole length of the spine on both sides
-from sacrum to skull
-goes through all regions, cervical, thoratic and lumbar
1.iliocostal
2.longissimum
3.spinalis
spinalis
-1 of 3 parts of the erector spinae
-runs entire length of vertebral column
-smallest and most medial (inner) to the spine
spinalis origins
spinous processors of the FIRST 2 LUMBAR and the LAST 2 THORATIC
spinalis insertion
the upper thoratic vertebrae anywhere from t4 to t8
spinalis action
extends the head
longissimum
-1 of three parts of the erector spinae
-the longissimus muscles run between the iliocostal and spinalis
-they extend laterally and flex the vertebral column
longissimum origin
many and varied
longissimum insertions
many and varied
longissimus action
-extends and laterally flexes the spine
-aids in compression of the ribs
-extends the head to bend and turn unilaterally
iliocostalis
-1 of 3 parts of the erector spinae
-most lateral to the spine (outer)
iliocostalis origin
many and varied
iliocostalils insertion
many and varied
iliocostalis action
-extends and laterally fleses the vertebral column
-aids in rotation of the spine
levetor scapular
situated at the back side of the neck and acts on the pectorial girdle
levator scapular origin
transverse processors of c1 - c4
levator scapular insertion
the superior (upper part) of the medial (inner) border of the scapular
levator scapular action
-elevates the scapular shrugging
-tilts the head side to side ear to shoulder
supraspinatus
-part of the rotator cuff muscles
-located at the back of the shoulder
supraspinatus origin
all of the supraspinatus fossa which is the concave surface at the top of the scapular
supraspinatus insertion
insertion into the greater tubercal of the hummerous (long arm bone)
supraspinatus action
assists the deltoid muscle in abducting or lifting the arm
