Part 3 - Dermatomes And Myotomes Flashcards
What is a Dermatome?
Area of skin supplied by a single spinal nerve
What is a myotome?
A group of muscles supplied by a single spinal nerve
What is a motor unit?
A single motor neurone (ONE AXON) and the skeletal muscle fibres it innervates
What is a motor unit?
A single motor neurone and the skeletal muscle fibres it innervates
What is the function of the myotome supplied by L2?
L2 = Hip Flexion
What is the function of the myotome supplied by L3?
L3 = Knee extension
(Hip ADduction)
What is the function of the myotome supplied by L4?
L4 = Ankle dorsiflexion
What is the function of the myotome supplied by L5?
L5 = Great toe extension
(Ankle inversion + hip ABduction)
What is the function of the myotome supplied by S1?
S1 = Plantarflexion of ankle
(Ankle eversion/hip extension)
What is the function of the myotome supplied by S2?
S2 = Great toe Flexion
(Knee Flexion)
What is Hilton’s Law?
The nerves crossing a joint supply:
-The muscles acting on the joint
-The sin over the insertion of the muscles
-The joint itself
What peripheral nerve supplies Rectus femoris, Vastus medialis, Vastus intermedius and Vastus lateralis, the knee joint and the skin over the insertion of the quadriceps femoris muscles?
Femoral nerve (L2, L3, L4)
What is likely to happen if the femoral nerve is damaged?
Paralysis in muscles supplied by femoral nerve distal to site of injury
Anaesthesia in cutaneous distribution and its branches
What is a clinical neural level?
The lowest completely intact layer of full sensation and motor function
