Dermatomes and myotomes Flashcards
What nerve supplies C5?
Axillary
What muscle does the axillary nerve supply?
Deltoid (little bit of aupraspinatus)
What movement is the axillary nerve responsible for?
Shoulder abduction
If the axillary nerve is damaged what would you see?
- common in shoulder dislocation
- sensory loss where a badge goes
- if weak shoulder abduction and adduction then need to think about a proximal myopathy
What nerve supplies C6?
Musculocutaenous
What muscles does the musculocutaneous nerve supply?
Bicep
What movement is the musculocutaneous nerve in control of?
Elbow flexion
What nerve supplies C7?
Radial
What muscle does the radial nerve supply?
Elbow extension
If the radial nerve is damaged how would a patient present?
Wrist drop as runs through the spinal groove of the humerus
What is the nerve root of the ulnar nerve?
C8/T1
What muscles does the ulnar nerve supply?
Hypothenar muscle
Abductor policis
Interossei of hand
What movement is the ulnar nerve responsible for?
Wrist flexion and adduction
Where does the median nerve supply?
Sensory sensation to the palmar thumb to 1/2 of the 4th finger
Where does the ulnar nerve supply?
Sensory sensation to the little finger to half of the 4th finger
Where does the radial nerve provide sensory sensation?
Anatomical snuffbox
What nerve root is responsible for hip flexion?
L1/2
Which muscles are responsible for hip flexion?
Iliopsoas
Sartorius
What is the nerve roots for the gluteal nerve
L5/S1/S2
Which muscles are supplied by the gluteal nerve
GLuteus maximus, medius and minimus
What is the gluteal nerve responsible for
Hipe extension (if hip flexion and extension are weak think about proximal myopathy)
What are the nerve roots for the femoral nerve?
L2/3/4
What does the femoral nerve innovate
Quadriceps femoris
What is the femoral nerve responsible for?
Knee extension (L2, 3, 4 knocks down the door)
What are the nerve roots for the sciatic nerve?
L5/S1
Which muscles are supplied by the sciatic nerve?
Hamstrings:
- biceps femoris
- semitendinosus
- semimembranosus
What action is the sciatic nerve in charge of
Knee flexion
What is the nerve roots of the common peroneal?
L4/5
What does the common peroneal supply?
Tibialis anterior
What movement is the common peroneal responsible for?
ankle dorsiflexion (causes ankle drop)
What is the nerve root of the tibial nerve?
S1/2
What does the tibial nerve supply?
Gastonemius and soleus
What movement is the tibial nerve responsible for?
ankle plantar flexion
What do the nerve roots L4-S3 innervate?
Peroneus longus and brevis, tibialis anterior and posterior
Which nerve has the nerve roots L4-S3?
Peroneal
What is the superficial peroneal nerve responsible for?
Foot eversion
What is the deep peroneal nerve responsible for?
Foot inversion
Name 5 causes of proximal myopathy
- Muscular dystrophy
- Thyroid disease e.g. hyperthyroidism
- Parathyroid disease
- Pituitary dysfunction e.g. Addisons
- Corticosteroids e.g. Cushings
How do you differentiate a peroneal palsy from L4/5 radiculopathy?
- Ask if any back pain (if yes probably a radiculopathy)
b) Ask the patient to invert their ankle, if they can do it then it means that it is a peroneal nerve
palsy, if they can’t then it is an L4/5 radiculopathy because it will also affect the tibialis posterior which will prevents you from being able to invert the foot.
What level should you do a lumbar puncture?
L2-5
How does a nerve disease present?
Distal weakness
How does a muscle disease present?
Proximal weakness
