The lumbosacral plexus Flashcards
What branch of the femoral nerve innervates the skin of the anterior thigh, medial aspect of the leg and foot?
saphenous nerve
What colour is the deep peroneal nerve?
Green
What muscles are supplied by the obturator nerve?
- gracilis
- adductor longus
- adductor brevis
- anterior portion of adductor magnus
What muscles are innervated by the deep peroneal nerve?
All muscles in the anterior leg compartment
tibialis anterior
extensor digitorum longus
extensor halicus longus
What muscles are innervated by the tibial nerve?
- Hamstrings
- muscles of the posterior leg
- sole of the foot by the plantar nerves
True or false?
The sciatic nerve innervates everything below the knee apart from the skin on the medial leg
True
The skin on the median leg is innervated by the saphenous nerve
What colour is the femoral nerve?
Yellow
Which ventral rami make up the lumbar plexus?
L1-L5
What nerves are supplied by the S1 nerve root? (5)
- sciatic
- tibial
- common peroneal
- superior gluteal
- inferior gluteal
What nerve roots does the obturator nerve have?
L2
L3
What muscles are supplied by the sciatic nerve?
The hamstrings
and the posterior portion of adductor magnus
through the tibial component
What nerves are supplied by the S2 nerve root? (4)
- sciatic
- tibial
- common peroneal
- inferior gluteal
What colour is the tibial nerve?
Red - below the knee
What parts of the skin is innervated by the tibial nerve?
The posterior leg
the sole of the foot by the sural nerve
Which colour is the sciatic nerve?
red
Which nerve innervates the skin of the medial thigh?
The obturator nerve
What nerves are supplied by the L2 nerve root? (2)
- femoral
- obturator
What muscles are supplied by the femoral nerve?
- Quadriceps (rectus femoris, vastus medialis, vastus intermedius, vastus lateralis)
- Sartorius
- Pactineus
What nerve roots does the inferior gluteal nerve have?
L5
S1
S2
Where can the gluteal nerves be located?
the gluteal region
What muscles are innervated by the superior gluteal nerves?
The abductors of the thigh ; gluteus medius and gluteus minimus
What nerves are supplied by the L3 nerve root? (2)
- Femoral
- Obturator
What colour is the superficial peroneal nerve?
purple
What nerve innervates the skin on the lateral leg and dorsum of the foot?
superficial peroneal nerve
What nerve roots does the tibial nerve have?
L4
L5
S1
S2
S3
What is the sacral plexus made up of?
- The lumbosacral trunk (L4 & L5)
- Ventral rami of S1-S3
What 2 muscles are innervated by the superficial peroneal nerve?
- peroneus longus
- peroneus brevis
Which 2 nerves combine to make the sciatic nerve?
- tibial nerve
- common peroneal nerve
Where is the obturator nerve located?
The medial compartment of the thigh
True or false?
The gluteal nerves don’t innervate the skin at all
True
What skin is innervated by the deep peroneal nerve?
the 1st webspace
Which 2 branches of the tibial nerve innervate the:
1) muscles in the sole of the foot
2) the skin in the sole of the foot
- the plantar nerves
- the sural nerve
What does the lumbosacral plexus consist of?
The lumbar plexus
the sacral plexus
What nerve roots does the common peroneal nerve have?
L4
L5
S1
S2
What nerves are supplied by the S3 nerve root? (2)
- sciatic
- tibial
What colour is the obturator nerve?
Blue
Where is the femoral nerve located?
In the anterior compartment of the thigh
Where can you locate the deep peroneal nerve?
The anterior nerve
What nerve roots does the sciatic nerve have?
L4
L5
S1
S2
S3
What is a plexus and why do we have it?
- a network of nerves derived from nerve roots
- allows multiple nerve roots to enter a single peripheral nerve
What colour is the deep peroneal nerve?
Green
What muscle does the inferior gluteal nerve innervate?
gluteus maximus
What nerves are supplied by the L5 nerve root? (5)
- sciatic
- tibial
- common peroneal
- superior gluteal
- inferior gluteal
What nerve roots does the superior gluteal nerve have?
L4
L5
S1
What nerve roots does the femoral nerve have?
L2
L3
L4
What colour is the femoral nerve?
Yellow
Where can you locate the superficial peroneal nerve?
the lateral leg
What nerves are supplied by the L4 nerve root? (5)
- femoral
- sciatic
- tibial
- common peroneal
- superior gluteal
What is a nerve root?
- The vertebral level whereby a nerve branches off from the spinal cord
- nerve roots connect peripheral nervous system to central nervous system
- brain uses vertebral level to map out areas of the body
