L6 - Anterior And Medial Thigh

Question 1

What is the nerve root of the obturator nerve?

Answer 1

L2-4

Question 2

What is the nerve root of the sciatic nerve?

Answer 2

L4-S3

Question 3

What is the nerve root of the tibial nerve (of sciatic nerve)

Answer 3

L4-S3

Question 4

What is the nerve root of the common fibular nerve ( of sciatic nerve)?

Answer 4

L4-S2

Question 5

Describe testing the patellar reflex

Answer 5

Tests the function of the femoral nerve and spinal cord segments L2-4
The absence or decrease of this reflex is known as Westphal’s sign

Question 6

What is the calcaneal tendon reflex?

Answer 6

Tests the S1 and S1 nerve roots

If the nerve root is cut or compressed the ankle reflex is virtually absent

Question 7

What is the iliopsoas origin?

Answer 7

Lateral portion of centra/bodies of T12-L5

Question 8

What is the iliopsoas insertion?

Answer 8

Lesser trochanter

Question 9

What is the origin of sartorius muscle?

Answer 9

ASIS

Question 10

What is the insertion of the sartorius?

Answer 10

Pes anserinus

Question 11

What is the pes anserinus?

Answer 11

Common insertion for three muscles innervated by three separate nerves
Includes sartorius, gracilis and semitendinosus

Question 12

What are the functions of the sartorius?

Answer 12

Flex, abduct and laterally rotate thigh

Flex leg

Question 13

Which three muscles are in the anterior thigh?

Answer 13

Iliopsoas, sartorius, and quadriceps femoris

Question 14

What is the origin of the quadriceps femoris?

Answer 14

Rectus femoris = AIIS

Vasti = shaft of femur

Question 15

What is the insertion for the quadriceps femoris?

Answer 15

Tibial tuberosity

Question 16

What is the function of the quadriceps femoris?

Answer 16

Vasti extend leg

Rectus extends leg and flexes thigh

Question 17

The tendons of all quadriceps femoris muscles unite to form what?

Answer 17

Quadriceps tendon which continues inferiorly as the patellar ligament

Question 18

What are the superficial medial thigh muscles (adductors)?

Answer 18

Pectineus, adductor longus, adductor brevis, gracilis

Question 19

What is the origin of the pectineus muscle?

Answer 19

Pecten line of pubis

Question 20

What is the insertion of the pectineus muscle?

Answer 20

Pectineal line just inferior to lesser trochanter

Question 21

What is the pectineus innervated by?

Answer 21

Femoral nerve (occasionally a branch from the obturator nerve) 
Only superficial medial thigh muscle thats innervated by femoral nerve

Question 22

What is the origin of the adductor longus?

Answer 22

Body of pubis (inferior to pubic crest)

Question 23

What is the insertion of the adductor longus?

Answer 23

Middle 1/3 of Linea aspera

Question 24

What are the superficial medial thigh muscles (except for pectineus) innervated by?

Answer 24

Obturator nerve

Question 25

What is the origin of the adductor brevis?

Answer 25

Pubis body and inferior ramus

Question 26

What is the insertion for the adductor brevis?

Answer 26

Proximal Linea aspera

Question 27

What is the function of the superficial medial thigh muscles?

Answer 27

Adducts and flexes thigh | Medially rotate leg (gracilis only)

Question 28

Which muscle is the only adductor to cross the knee?

Answer 28

Gracilis

Question 29

What is the origin of the gracilis muscle?

Answer 29

Pubis body and inferior ramus

Question 30

What is the insertion site for the gracilis muscle?

Answer 30

Superior part of medial surface of tibia (part of pes anserinus)

Question 31

Which muscles are the deep medial muscles of the thigh?

Answer 31

Obturator externus and adductor magnus

Question 32

Which deep medial thigh muscles are innervated by the obturator nerve?

Answer 32

Obturator externus and adductor portion of adductor magnus

Question 33

What is the origin and insertion of the obturator externus?

Answer 33

O: External margin of obturator I: trochanteric fossa

Question 34

Which muscle is the largest adductor muscle?

Answer 34

Adductor magnus | Consists of two parts based on attachments: adductor and hamstring portion

Question 35

Describe the adductor portion of the adductor magnus

Answer 35

O: ischiopubic ramus I: gluteal tuberosity, Linea aspera and medial supracondylar line Adducts and flexes thigh

Question 36

Describe the hamstrings portion of the adductor magnus?

Answer 36

O: ischial tuberosity I: adductor tubercle (medial epicondyle) Innervated by tibial division of sciatic nerve Adducts and extends the thigh

Question 37

Describe the medial femoral septa

Answer 37

Adduction | Obturator nerve

Question 38

Describe the posterior femoral septa

Answer 38

Flexion | Sciatic nerve

Question 39

Describe the anterior femoral septa

Answer 39

Extension | Femoral nerve

Question 40

What innervates all anterior thigh muscles?

Answer 40

Femoral nerve | Exception: psoas major is innervated by anterior rami

Question 40

Which anterior thigh muscle is the only one that crosses two joints?

Answer 40

Rectus femoris | Flexes thigh and extends leg

Question 40

Which is the only adductor muscle not innervated by the obturator nerve?

Answer 40

Pectineus | Innervated by femoral nerve

Question 41

Which adductor is the only one that crosses the knee?

Answer 41

Gracilis