APE 3: Nerves Flashcards
Name the 5 major peripheral nerves of the brachial plexus
The musculocutaneous nerve The radial nerve The axillary nerve The median nerve The ulnar nerve
Which 5 spinal nerve roots supply the brachial plexus?
C5 C6 C7 C8 T1
Which spinal nerve roots supply the musculocutaneous nerve?
C5, C6, C7
Which spinal nerve roots supply the radial nerve?
C5 C6 C7 C8 T1
Which spinal nerve roots supply the axillary nerve?
C5 C6
Which spinal nerve roots supply the median nerve?
C5 C6 C7 C8 T1
Which spinal nerve roots supply the ulnar nerve?
C8 T1
What does the brachial plexus consist of?
Roots (5) Trunks (3) Divisions (6) Cords (3) Branches (5)
Which 8 spinal nerve roots supply the lumbosacral plexus?
L1 L2 L3 L4 L5 S1 S2 S3
Which spinal nerve roots supply the lumbar plexus?
L1 L2 L3 L4
Which spinal nerve roots supply the sacral plexus?
S1 S2 S3 and the lumbosacral trunk is supplied by L4/5
What is the largest nerve in the body?
The sciatic nerve
What 2 nerves does the sciatic nerve bifurcate into?
The tibial nerve and the common fibular nerve
What is the motor target of the tibial nerve?
The muscles of the posterior thigh (hamstring), and the triceps surae (the soleus and the gastrocnemius)
What muscles does the femoral nerve supply?
The quadriceps
What’s the name of the tendon struck for the knee jerk reflex?
The patellar tendon
What does the obturator nerve supply?
The medial compartment of the thigh (adductor)
Describe the origin of the spinal roots
Each spinal nerve is attached to the cord by 2 roots. The anterior root contains motor fibres leaving the spinal cord, while the posterior root contains sensory fibres entering the spinal cord. The dorsal root has a discrete swelling called the dorsal root ganglion, while the ventral root does not. The dorsal root ganglion contains cell bodies of primary sensory neurones.
