Neural pathways Flashcards
What are the nerve roots of the femoral nerve?
L2, L3, L4.
What is the pathway of the femoral nerve?
Through psoas major, between iliacus, enters femoral triangle (bounded by sartorius, adductor longus, inguinal ligament).
What are the motor branches of the anterior division?
Pectineus, sartorius.
How does the femoral nerve divide?
Divides into anterior and posterior divisions.
What are the sensory branches of the anterior division?
Medial cutaneous nerve of the thigh, intermediate cutaneous nerve.
What is the sensory branch of the posterior division?
Becomes the saphenous nerve.
What muscles are innervated by the posterior division?
Quadriceps (rectus femoris, vastus lateralis, vastus medialis, vastus intermedius).
What are the functions of the femoral nerve?
Hip flexion (iliopsoas), knee extension (quadriceps), thigh abduction (sartorius).
What is the sensory innervation of the saphenous nerve?
Medial/anterior/posterior medial lower limb, medial calf, medial foot arch.
From which nerve does the saphenous nerve branch?
Femoral nerve.
What is the pathway of the saphenous nerve?
Arises in the femoral triangle, passes through the adductor canal, runs along the saphenous vein, and continues to the ankle and foot.
What are the nerve roots of the obturator nerve?
L2, L3, L4.
What is the pathway of the obturator nerve?
Travels along the iliopectineal line, descends through psoas major, and passes through the obturator canal.
What muscles are innervated by the obturator nerve?
Adductor longus, adductor brevis, gracilis, obturator externus.
What are the functions of the obturator nerve?
Hip adduction, medial thigh stabilization, external hip rotation.
What are the nerve roots of the radial nerve?
C5-T1.
What is the pathway of the radial nerve?
Exits the brachial plexus posteriorly, wraps around the humerus in the radial groove, passes through the cubital fossa, and divides into deep (motor) and superficial (sensory) branches.
What is the sensory innervation of the radial nerve?
Posterior arm and forearm, dorsal aspect of lateral 3.5 fingers (except fingertips).
What muscles are innervated by the radial nerve?
Triceps brachii, brachioradialis, supinator, extensor carpi radialis, extensor digitorum, extensor pollicis.
What are the nerve roots of the median nerve?
C5-T1.
What is the sensory innervation of the median nerve?
Palmar aspect of thumb, index, middle, half of ring finger; dorsal aspect of distal thumb and next two fingers.
What is the pathway of the median nerve?
Descends alongside the brachial artery, through the carpal tunnel to the hand.
What are the nerve roots of the ulnar nerve?
C8-T1.
What is the sensory distribution of the ulnar nerve?
Dorsal and palmar aspects of the 5th and medial half of the 4th finger.
What is the pathway of the ulnar nerve?
Travels down the medial arm, passes through the cubital tunnel, continues into the hand via Guyon’s canal.
What are the nerve roots of the sciatic nerve?
L4-S3.
What is the pathway of the sciatic nerve?
Originates from the lumbosacral plexus, passes through the greater sciatic foramen, and divides into tibial and common peroneal nerves.
What are the nerve roots of the tibial nerve?
L4-S3.
What is the pathway of the tibial nerve?
Passes through the popliteal fossa, beneath the flexor retinaculum, and divides into medial/lateral plantar nerves.
