Back Muscles

Back Muscles

1. Extrinsic Muscles

   • Trapezius Muscle
     • Spinal Accessory Nerve (CNXI)
   • Latissimus Dorsi
     • Thoracodorsal Nerve (C6,7,8)
   • Levator Scapulae
     • C3,4
   • Rhomboid Minor and Major
     • Dorsal Scapular Nerve (C5)
   • Serratus
     • Serratus Anterior
       • Long Thoracic Nerve (C5,6,7)
     • Serratus Posterior

2. Intermediate Muscles

   • Ventral Ramus
     • Serratus Posterior Superior
       • inspiration of air
     • Serratus Posterior Inferior
       • expiration of air

3. Intrinsic/Deep/True Muscles

   • Superficial Layer
     • Splenius
       • helps in extension of neck
       • means bandage
   • Intermediate Layer
     • Erector Spinae Muscles
       • Spinalis
       • Longissimus
       • Iliocostalis
   • Deep Intrinsic Muscles
     • Transversospinal Muscles
       • Semispinalis
         • 6-8 Vertebral levels
       • Multifidus
         • 4 Vertebral levels
       • Rotatores
         • 1-2 Vertebral levels
   • Supplied by Segmental Dorsal Rami