Muscles of the back Flashcards
Origin of Iliocostalis
Iliac crest and sacrum
Insertion of Iliocostalis
Angles of ribs
Origin of Longissimus
TVP’s at inferior vertebral levels
Action of Iliocostalis
Extends and laterally bends trunk and neck
Insertion of Longissimus
TVP’s at superior vertebral levels and mastoid process
Action of Longissimus
Extends and laterally bends trunk and neck
Origin of Spinalis
SP’s of vertebrae below
Insertion of Spinalis
SP’s of vertebrae above (includes base of skull)
Action of Spinalis
Extends and laterally bends the trunk and neck
What makes up the Erector Spinae group
Spinalis, iliocostalis, longissimuss
What makes up the intrinsic back muscles
Interspinalis & Intertransversarii
Origin of Interspinales
Upper border of spinous processes
Insertion of Interspinales
Lower border of SP’s above
Action of Interspinales
Extends trunk and neck
Origin Intertransversarii
Upper border of TVPS
Insertion of Intertransversarii
Lower border of TVPS above
Action of Intertransversarii
Laterally bends trunk and neck
Origin of multifidus
Sacrum, TVPS of C3-L5
Insertion of multifidus
SP’s 2-4 levels above their origin
Action of Multifidus
Extends and laterally bends trunk and neck
Rotates to opposite side then what muscle s on
What makes up the Transversospinalis muscles
Multifidus,
Rotatores,
Semispinalis
Origin of Rotatores
TVPS
Insertion of Rotatores
Long rotatores : SP’s 2 vertebrae above origin
Short rotatores: SP’s 1 vertebrae above orgin
Action of Rotatores
Rotates vertebral column to opposite side
Action of Semispinals
Extends and laterally bends the trunk and rotates trunk to opposite side
