Nerves of the Lower Limb Flashcards
what rami make up the lumbosacral plexus?
ventral rami of L1-S4
What are the nerve roots of the femoral nerve?
L2-L4
what are the nerve roots of the sciatic nerve?
L4-S3
what branches does the femoral nerve give off?
muscular, anterior cutaneous femoral and saphenous branches
what is the sensory innervation of the femoral nerve?
hip + knee joints
skin on the anterior surface of the thigh through the anterior cutaneous femoral branch
skin on the medial leg and foot through the saphenous nerve
what is the motor innervation of the femoral nerve?
Iliacus
muscles in the anterior compartment of the thigh (Quadriceps Femoris, Sartorius, Pectineus)
what are the nerve roots of the saphenous nerve?
L3-L4
What is the sensory supply of the saphenous nerve?
skin on the medial surface of the knee
anteromedial surface of the leg
medial malleolus
What are the nerve roots of the obturator nerve?
L2-L4
What is the sensory innervation of the obturator nerve?
hip joint
upper half of the medial thigh
knee joint
What is the motor innervation of the obturator nerve?
obturator externus
Medial Thigh Compartment: Adductor magnus, Adductor Longus, Adductor Brevis, Gracilis
What are the nerve roots of the sacral plexus?
L4-S4
What are the nerve roots of the superior gluteal nerve?
L4-S1
What are the nerve roots of the inferior gluteal nerve?
L5-S2
What structures are supplied by the superior gluteal nerve?
gluteus medius, gluteus minimus, tensor fasciae latae
What structures are innervated by the inferior gluteal nerve?
gluteus maximus
How does the sciatic nerve enter the gluteal region?
infrapiriform space
how does the superior gluteal nerve exit the pelvis?
through the suprapiriform space
how does the inferior gluteal nerve exit the pelvis?
through the infrapiriform space
what is the sensory innervation of the sciatic nerve?
hip joint
what is the motor innervation of the hip joint?
posterior compartment of the thigh (hamstrings)
adductor magnus
what are the root values of the tibial nerve?
L4-S3
what is the sensory innervation of the tibial nerve?
ankle joint
skin of heel
What is the motor innervation of the tibial nerve?
Hamstring muscles (EXCEPT short head of biceps femoris)
Plantaris, Soleus
Superficial & Deep posterior compartments of the leg
What is the motor supply of the medial plantar nerve?
abductor hallucis, flexor hallucis brevis, flexor digitorum brevis, lumbrical 1
what is the sensory supply of the medial plantar nerve?
The anterior two-thirds of the sole and adjacent surfaces of the medial 1.5 toes
What is the sensory innervation of the lateral plantar nerve?
the skin on the lateral side of the anterior two-thirds of the sole and the adjacent plantar surfaces of the lateral 1.5 digits
what are the root values of the common peroneal nerve?
L4-S2
what does the peroneal nerve supply?
short head biceps femoris
what is the sensory innervation of the sural nerve?
skin on lower posterolateral surface of the leg and the lateral side of the foot
what are the root values of the deep fibular nerve?
L4-L5
what is the sensory innervation of the deep fibular nerve?
ankle joint
between 1st and 2nd toes
what is the motor innervation of the deep fibular nerve?
muscles in the anterior compartment of the leg
extensor hallucis longus extensor digitorum longus fibularis tertius EDB EHB
what are the root values of the superficial fibular nerve?
L5-S2
what is the sensory innervation of the superficial fibular nerve?
ankle joint, skin on anterior distal leg, skin on dorsum of foot
what is the motor innervation of the superficial fibular nerve?
muscles in the lateral compartment of the leg
fibularis longus
fibularis brevis
What nerve supplies the dorsal group muscles of the foot? What are its nerve roots?
Deep fibular nerve
S1-S2
What nerve supplies the abductor hallucis? What are its nerve roots?
Medial plantar nerve S1-3
What nerve supplies the flexor digitorum brevis? What are its roots?
Medial plantar nerve S1-3
What nerve supplies the abductor digiti minimi? What are its nerve roots?
Lateral plantar nerve S1-3
What nerve supplies the quadratus plantae?
Lateral plantar nerve S1-3
What is the innervation of the lumbrical muscles?
1st Lumbrical: Medial plantar nerve
All others: Lateral Plantar Nerve
What is the innervation of the flexor hallucis brevis?
medial plantar nerve
What is the innervation of the adductor hallucis and flexor digiti minimi brevis?
Lateral Plantar nerve
What is the innervation of the dorsal interossei of the foot?
Lateral plantar nerve S2-3
1-2 innervated by the deep fibular nerve S2-3
