lumbosacral plexus Flashcards
5 major peripheral nerves of sacral plexus
superior gluteal nerve inferior gluteal nerve sciatic nerve posterior femoral cutaneous nerve pudendal nerve
superior gluteal nerve originates from what nerve roots
L4, L5, S1
Superior gluteal nerve is responsible for the motor innervation of what muscles
gluteus minimus
gluteus medius
tensor fasciae latae
inferior gluteal nerve originates from what nerve roots
L5, S1, S2
Inferior gluteal nerve is responsible for the motor innervation of what muscles
gluteus maximus
sciatic nerve originates from what nerve roots
L4, L5, S1, S2, S3,
Divisions of the sciatic nerve
dorsal - fibular L4 - S2
ventral - tibial - L4 - S3
Tibial part of the sciatic nerve is responsible for the motor innervation of what muscles
all muscles of the posterior compartment of thigh except bicep femoris short head
adductor magnus
posterior compartment of lower leg
in sole foot
fibular part of the sciatic nerve is responsible for the motor innervation of what muscles
short head bicep femoris
anterior lateral compartments of leg
extensor digitorum brevis of foot
Tibial part of the sciatic nerve is responsible for the sensory innervation of what muscles
posterior lateral compartment of leg and sole of foot
fibular part of the sciatic nerve is responsible for the sensory innervation of what muscles
anterior lateral compartment of leg dorsal aspect of foot
posterior femoral nerve originates from what nerve roots
S1 -S3
posterior femoral nerve is responsible for the sensory innervation of what muscles
posterior compartment of leg and perineum
pudendal nerve originates from what nerve roots
S2-S4
pudendal nerve innervates
external urethral and anal sphincter
pelvic bone
skeletal muscles of perineum
causes of superior gluteal nerve damage
hip dislocation and hip fractures
symptoms of superior gluteal nerve damage
loss of motor function gluteus medius
weakened abduction
causes of inferior gluteal nerve damage
complications caused by hip replacement
trauma
entrapment
compression
symptoms of inferior gluteal nerve damage
weakened leg extension
weakness in gluteus maximus
muscle atrophy of gluteus maximus
causes of sciatic nerve damage
inflammation
compression
bone spurs of lower back
herniated disk
symptoms of sciatic nerve damage
pain in lower back, buttock and back of legs
pain worsens with movement
numbness
causes of posterior femoral nerve damage
direct trauma
fractured pelvis
tumours
symptoms of posterior femoral nerve damage
numbness or tingling of the leg
muscle weakness
muscle cramping
sharp, jabbing pain
difficulty walking or extending the knee due to muscle weakness
atrophy, or shrinking, of the thigh muscles
branches of the lumbar plexus
iliohypogastric ilioinguinal genitofemoral lateral femoral cutaneous nerve femoral nerve obturator nerve
iliohypogastric nerve cutaneously innervates
skin over pubis
and lateral buttocks
iliohypogastric nerve motorly innervates
internal obliques
transverse abdominis
ilioinguinal nerve cutaneously innervates
skin on proximal and medial part of thigh
ilioinguinal nerve motorly innervates
internal obliques
transverse abdominis
nerve root of iliohypogastric nerve
L1 and T12
nerve root of ilioinguinal nerve
L1
Motor innervation from genitofemoral nerve to
cremasteric muscle
sensory innervation from genitofemoral nerve to
kin of the anterior scrotum (in males) or the skin over mons pubis and labia majora (in females). The femoral branch innervates the skin on the upper anterior thigh.
nerve root of genitofemoral nerve
L1, L2
nerve root of lateral cutaneous nerve
L2, L3
Sensory innervation from lateral cutaneous nerve to
anterior and lateral thigh down to the level of the knee.
nerve root of obturator nerve
L2-L4
Motor innervation from obturator nerve to
muscles of medial thigh
the obturator externus, adductor longus, adductor brevis, adductor magnus and gracilis.
sensory innervation from obturator nerve to
skin over medial thigh
nerve root of femoral nerve
L2-4
Motor innervation from femoral nerve to
muscles of the anterior thigh – the illiacus, pectineus, sartorius and quadriceps femoris.
sensory innervation from femoral nerve to
skin on the anterior thigh and the medial leg.
