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Muscles of the back

Extrinscic back muscles

Intrinsic back muscles

Superficial layer

Intermediate layer (errector spinao m.)

-    iliocastalls (latcral column)

• lumborum (—ribs 2-4)

-    thoracis (—ribs 5-8)

-    ccrvlcls (— tp C3-6)

-    longissimus (intermediate column) -thoracis (— tp T1-L5*ribs 11-12)

-    ccrvicis (— tp C2-5)

-    capitis (mastoid process)

-    spinalis (medialcolumn)

-    thoracis (—sp T1-7)

-    cervicis (—sp C2-4)

-    capitis (occipital squama)

Deep + minor layers

Muscles of the back

Extrinscic back muscles

Intrinsic

back muscles

Superficial layer Intermediate layer

Deep layors (transversospinalis mm.)

-    semispinalis (tp C4-T12)

-    thoracis (- tp T1-L5*ribs 11-12)

-    cervicis (— tp C2-5)

•    capitis (occipital squma)

-    multifidus (sacrum, mp L, tp T1-3, ap C4-7)

-    lumborum (sp 2-4 segments above)

-    thoracis

-    cervicis

-    rotatores (tp T1-T12)

•    thoracis (sp+tp 1-2 scgmonts above)

-    cervlcÅ‚s