Dermatomes origins and myotomes weakness 

Dermatomes origins and myotomes weakness 

• C2
  • OCCIPUT, temple, and forehead 
  • Weakness include sternocleidomastoid
• C3
  • ENTIRE NECK, cheek, mandible, and temporal area 
  • Weakness include Trapezius
• C4
  • CLAVICULAR AREA, shoulder, and upp scapular area 
  • Weakness include Trapezius and leavator scap 
• C5
  • DELTOID AREA, anterior aspect of arm, and based of thumb 
  • Weakness include supraspinatus, infraspinatus, DELTIOD, and biceps 
• C6
  • ANTERIOR ARM RAIDATING TO THUMB SIDE 
  • Weakness include BICEPS, SUPINATOR, and wrist extensors 
• C7
  • Along index/long/ring finger  
  • Weakness include TRICEPS and wrist extensors 
• C8
  • Along ring/little finger  
  • Weakness include THUMB EXTENSION 
• T1
  • Medial aspect of fore arm 
  • No rooted weakness (if so it is due to diseases) 
• L1
  • Groin 
  • No rooted weakness 
• L2
  • Front of thigh to knee 
  • Weakness include PSOAS and hip adductors 
• L3
  • Medial lower leg 
  • Weakness include QUADS and psoas 
• L4
  • Dorsum of foot to big toe 
  • Weakness include ANTERIOR TIB and extensor hallucis 
• L5
  • Dorsum of foot to 2nd to third toe 
  • Weakness include DORSIFLEXION and extensor hallucis 
• S1
  • Lateral aspect of foot and plantar aspect 
  • Weakness include CALF, hamstring, PLANTAR FLEXORS, and peroneals 
• S2
  • Posterior medial leg 
  • Same as S1 without peroneals