click below
click below
Normal Size Small Size show me how
Myology 1
Lecture 11
Question | Answer |
---|---|
muscles of posterior trunk | latissimus dorsi,rhomboids,serratus anterior,serratus posterior superior,serratus posterior inferior,erector spinae group, |
latissimus dorsi | fibers twist that superior fibers attach distally on humerus and inferior fibers attach proximally,sometimes blends with teres major,attach via thoracolumbar fascia.can move scap,arm fixed elevate trunk at shoulder(pull up),adduct and IR arm |
latissimus dorsi OIAN | O=thoracolumbar aponeurosis,post sacrum,post iliac crest,lower 3-4 ribs,inf angle of scap |
rhomboids | deep to traps,minor sup to major,minor attach to scap,inf to lev scapulae,downwardly rot scap,christmas tree mm,weak rhomboids=rounder shoulders |
rhomboid major OIAN | O=SP T2-T5.I=medial border of the scap from root of spine to inf angle of scap.A=retracts,elevate and downward rot scap.rev mm action=unilaterally contralateral rotation of trunk.N=dorsal scap nn |
serratus anterior | deep to scap & lats post 7 pecs ant.lowest 4-5 ribs of costal attachment interdigiate c external oblique,ant to subscapularis.prime mover of protraction,upward rot & medial tilt of scap.req during forceful protraction of scap punch.weak=winging |
serratus anterior OIAN | O=outer borders of 1st-9th ribs,I=ant surface of the entire medial border of scap.A=PUSS/PURS protracts-upwardly rot-stabilize scap.N=long thoracic nn |
serratus posterior superior | thin,quadrilateral shape,respiration/inspiration elevates ribs 2-5 increasing size of thoracic cage(boyles law),deep to rhomboids |
serratus posterior superior OIAN | O=SP of C7-t3.I=superior borders of ribs 2-5.A=elevate ribs 2-5.N=intercostal nn |
serratus posterior inferior OIAN | O=SP T11-L2,I=inf border of ribs 9-12,A=depress ribs.N=subcostal and intercostal |
erector spinae group | 5th layer,make spine erect.deep,L/S=deep to lat and serratus post inf.T/S=deep to trap,lat,rhomb,serratus post sup,spleius cap/cerv.C/S=deep to trap,splen cap/cerv SCM.trunk=superficial to transversospinalis group,QL,ribcage.neck=superficial to subocc. |
erector spinae group OIAN | O=Pelvis,I=spine,ribcage,head.A=bilat extends trunk,neck,head,ant tilt pelvis.uilateral lateral flex and ipsilateral rot trunk,head,neck,elevate pelvisN=dorsal rami of spinal nn |
individual erector spinae muscles | spinalis,longissimus,iliocostalis |
iliocostalis lumborum OIAN | O=medial iliac crest and sacrum.I=angles of ribs 7-12.A=bilat extends trunk and neck and ant tilt.unilat lat flex and ipsilat rot trunk and neck,elevate pelvis |
longissimus thoracis OIAN | O=medial iliac crest,post sacrum, TP L1-5.I=TP of thoracic vert and 9 lower ribs.A=bilat extend trunk and neck and ant tilt pelvis.unilateral lat flex and ipsilat rot trunk,neck and head,elevate pelvis.N=dorsal rami CTL spinal nn |
spinalis thoracis OIAN | O=SP T11-12,SP t4-T8,bilat extends trunk and neck,unilater lateral flex and ipsilateral rot of trunk,neck,head.N=dorsal rami of CTL spinal nn |
mm of erector spinae group | spinalis,longissimus and iliocostalis med to lat SLI |
erector spinae group mm med to lat | SLI |
spinalis | subdivided into Thoracis,cervisis,capitis most medial of three |
longissimus | thoracis,cervicis,capitis, longest and largest of three with most superior attachments |
iliocostalis | lumborum,thoracis,cervicis, most lateral of three |