Lumbosacral Plexus and lower leg

Question 1

Sensory to medial thigh (inner thigh)?

Answer 1

obturator n. (L2-L4)

Question 2

motor to medial thigh (inner thigh-abductors?

Answer 2

obturator n. (L2-L4)

Question 3

Sensory to lateral leg (not calf)

Answer 3

common fibular n. near knee but superficial fibular moving down

Question 4

sensory to lateral ankle and top of foot?

Answer 4

superficial branch of common fibular nerve

Question 5

sensory in between first and second toes?

Answer 5

deep branch of common fibular nerve

Question 6

sensory to medial leg (including calf)

Answer 6

saphenous n.

Question 7

sensory to heel

Answer 7

tibial n.

Question 8

sensory to back of thigh

Answer 8

posterior femoral cutaneous n. (S1-S3)

Question 9

sensory to lateral thigh

Answer 9

lateral femoral cutaneous n. (L2-L3)

Question 10

Medial leg corresponds to which dermatome? (L?S?)

Answer 10

L4 dermatome

Question 11

What part of the leg is not innervated by a branch of the sciatic nerve?

What nerve innervates this area?

Is it motor or sensory?

Answer 11

The medial leg is the only part of the leg and foot that is innervated by the femoral nerve and not branches of the sciatic nerve….the branch of the femoral nerve that innervates here is the saphenous nerve and it is only sensory

Question 12

sensory to lateral calf (not lateral leg)

Answer 12

sural n. (branch of the sciatic)

Question 13

Where do hamstrings attach on the “hip”?

Answer 13

ischial tuberosity

Question 14

What spinal level does the Femoral and obturator nerves come from?

Answer 14

L2-L4

Question 15

What spinal level does the lateral femoral cutaneous come from?

Answer 15

L2-L3

Question 16

What spinal level does the superior and inferior gluteal nerves come from?

Answer 16

Superior gluteal nerve: L4-S1

Inferior gluteal nerve: L5-S2

Question 17

What spinal level does the sciatic nerve come from?

Answer 17

L4-S3

Question 18

What spinal level does the posterior femoral cutaneous nerve come from?

Answer 18

S1-S3

Question 19

In some cases, the sciatic nerve can be entraped by which muscle in the gluteal region?

Answer 19

piriformis muscle

Question 20

What are the two muscles that are primarily attached to the IT band?

Answer 20

Gluteus maximus and TFL

Question 21

What are the 4 hamstring muscles and what nerve innervates them?

Answer 21

Biceps femoris (ONLY long head), semitendinosus, semimembranosus, and PART of the adductor magnus

All are innervated by the sciatic n.

Question 22

Which three muscles of the posterior leg have dual innervation and what are those innervations?

Answer 22

adductor magnus: sciatic and obturator
pectineus: femoral and obturator
biceps femoris (tibial and fibular portion of sciatic)

Question 23

List the 7 muscles of the anterior leg (thigh) and what innervates them?

Answer 23

1. Sartorious
2. rectus femoris
3. vastus lateralis
4. Vastus medialis
5. Vastus intermedius
6. illiopsoas
7. TFL

All are innervated by the femoral nerve (L2-L4) except for the TFL (superior gluteal L4-S1)

Question 24

List the 5 muscles of the medial leg and what they are innervated by?

Answer 24

1. Gracialis
2. Pectineus
3. Adductor longus
4. Adductor brevis
5. Adductor magnus

The pectineus and adductor magnus both have dual innervation

Question 25

What are the three muscles that form the PES Anserine (goose foot) and what are their innervations?

Answer 25

SGT FOT Sartorious-femoral n. Gracialis- obturator n. SemiTendinosus-sciatic n.

Question 26

Which muscle in the quadriceps acts on the hip joint? Where does it attach?

Answer 26

The rectus femoris is the only part of the quads that crosses the hip joint and attaches to the Anterior Inferior Iliac Spine

Question 27

When a person has a "waddling" gate when walking, they have a problem with the muscles of which compartment? A lesion in which nerve may cause this?

Answer 27

Adductors...may have obturator nerve lesion

Question 28

What hip movements do the gluteus medius and gluteus minimus perform?

Answer 28

Gluteus medius outwardly rotates while the gluteus minimus inward rotates. They both assist in hip abduction

Question 29

The Trendelenberg Sign tests for the integrity of which nerve/muscle and nerve root?

Answer 29

Superior Gluteal nerve (L4-S1): Gluteus medius and minnimus L5 root

Question 30

Blood supply to the posterior thigh?

Answer 30

Deep femoral artery

Question 31

An injury to the posterior thigh muscles (hamstrings) may result in weakness of what main actions at the hip and knee?

Answer 31

Hip extension and knee flexion