Dermatomes and Myotomes Flashcards
What is a dermatome?
A spinal nerve that innervates a particular sensory area.
What is a myotome?
A group of muscles that a single spinal nerve root innervates.
C5
D: radial antecubital fossa
M: Shoulder abductors.
Elbow flexors (biceps, brachialis, and brachioradialis)
C6
D: Thumb
M: Wrist extensors (extensor carpi radialis longus and brevis)
C7
D: Middle finger
M: Elbow extensors (triceps). Wrist flexors
C8
D: Little finger
M: finger flexors (distal phalanx - flexor digitorum profundus)
T1
D: Ulnar antecubital fossa
M: Hand intrinsics (interossei)
L2
D: Mid-anterior thigh
M: hip flexors (iliopsoas)
L3
D: Medial femoral condyle
M: Knee extensors (quadriceps)
L4
D: Medial malleolus
M: Ankle dorsiflexors
L5
D: Dorsal second/third toe web space
M: Long toe extensors (extensor hallucis longus)
S1
D: Lateral heel
M: Ankle plantar flexors (gastrocnemius, soleus)