Deep Back: Small Segmental Muscles

In general: Superior surface of inferior SP

Cervical region: 6 pairs starting between SP C2 and C3 ending between C7 and T1

Thoracic region: 2-3 pairs between T1 and T2, sometimes between T2 and T3, and between T11 and T12

Lumbar region: Fourpairs between the 5 lumbar vertebrae

Inferior surface of SP immediately superior to it

Dorsal rami of corresponding spinal nerves

Posterior branches of posterior intercostal arteries (PB PIA)

postural muscles

In general: Superior surface of inferior TP

Cervical region: 7 pairs starting between lateral mass of C1 to TP of C2 and ending between C7 and T1

Thoracic region: 4 pairs that exist between last three thoracic and 1st lumbar vertebrae

Lumbar region: 2 sets

Inferior surface of superior TP

Dorsal and ventral rami of spinal nerves

Muscular branches of the vertebral artery (cervical region), Posterior branches of posterior intercostal arteries (PB PIA)

Postural muscles