Lower Body Nerves

Question 0

What does the obturator nerve provide motor innervation to?

Answer 0

adductors (except posterior fibres of adductor magnus)

Question 1

What are the lumbar plexus and sacral plexus called together?

Answer 1

Lumbosacral plexus

Question 2

What is the largest nerve of the lumbar plexus?

Answer 2

femoral nerve

Question 3

What does the femoral nerve provide motor innervation to?

Answer 3

quadriceps, articularis genus, sartorius, pectineus

Question 6

What does the obturator nerve provide sensory innervation to?

Answer 6

medial thigh

Question 7

Where are the boundaries of pain for meralgia parasthetica?

Answer 7

does not pass below the knee, the midline of the thigh, or biceps femoris

Question 10

What does the femoral nerve provide sensory innervation to?

Answer 10

anteromedial thigh

Question 11

What does the sciatic nerve pass through?

Answer 11

greater sciatic foramen

Question 12

What is meralgia parasthetica? What can cause it? What does it affect?

Answer 12

• irritation or compression of the lateral subcutaneous nerve
• anterior pelvic tilt, compression of inguinal ligament
• affects anterolateral quadriceps

Question 13

Where does the lumbar plexus exit the vertebral column?

Answer 13

T12 - L4

Question 14

What does sciatic nerve provide sensory innervation to?

Answer 14

leg and foot, but not posterior thigh

Question 15

What muscle do branches of the lumbar plexus pierce?

Answer 15

psoas major

Question 17

With meralgia parasthetica, what movements can increase/decrease pain? What depth of touch hurts most?

Answer 17

• hip extension causes pain, hip flexion relives pain

- light touch hurts more than deep

Question 18

What muscle is the sciatic nerve closely associated with?

Answer 18

piriformis

Question 19

What is the injury presentation of the sciatic nerve?

Answer 19

pain in lower back and glutes, weakness in hamstrings, pain in lateral leg and foot

Question 20

What muscles does the sciatic nerve provide motor innervation to?

Answer 20

hamstrings, posterior fibres of adductor magnus, leg and foot

Question 21

What does the tibial nerve supply? Where does it pass behind?

Answer 21

• superficial and deep posterior layers

- medial maleolus

Question 22

What causes tarsal tunnel syndrome?

Answer 22

prolonged eversion

Question 23

What two nerves sharing a sheath branch out at the popliteal fossa?

Answer 23

tibial nerve and common peroneal nerve

Question 24

What is the largest and widest nerve of the body?

Answer 24

sciatic nerve

Question 25

Where does the obturator nerve exit the pelvis?

Answer 25

obturator foramen

Question 26

Where is the common peroneal nerve palpable?

Answer 26

biceps femoris tendon

Question 27

What nerve supplies the lateral side of the foot?

Answer 27

sural nerve

Question 28

How does the common peroneal nerve run?

Answer 28

inferolaterally through the popliteal fossa, wrapping around the neck of the fibula

Question 29

What does the pudendal nerve innervate?

Answer 29

external genitalia, sphincters for bladder and rectum

Question 30

Where is the common peroneal nerve most exposed?

Answer 30

neck of fibula

Question 31

Where does the superior gluteal nerve travel and what does it innervate?

Answer 31

- travels through the greater sciatic foramen | - innervates gluteus medius and minimus, and TFL

Question 32

What does the inferior gluteal nerve innervate?

Answer 32

- gluteus maximus | - deep lateral rotators

Question 33

Where does the tibial nerve go to?

Answer 33

tendinous arch of soleus

Question 34

What are common sites of sciatic nerve irritation?

Answer 34

lumbar disc herniation, piriformis compression

Question 35

What two nerves does the common peroneal nerve branch into?

Answer 35

superficial and deep

Question 36

What is the path of the deep peroneal nerve?

Answer 36

down anterior compartment of leg close to the interosseous membrane, innervating as it goes

Question 37

Where does the superficial peroneal nerve travel, and what does it innervate?

Answer 37

branches just below the neck of the fibula, innervating the lateral side of the leg and skin on dorsal side of foot (except between 1st and 2nd metatarsal)

Question 39

What does the femoral nerve run deep to?

Answer 39

inguinal ligament

Question 43

What direction does the lumbar plexus run? What is it deep to? What nerve is the exception?

Answer 43

inferolaterally, deep to the inguinal ligament, obturator nerve