Muscles of the Anterior and Medial Femoral Compartments

Question 1

iliopsoas

Answer 1

**consists of psoas major and iliacus

Question 2

attachments of psoas major

Answer 2

origin:
anterior surfaces of bodies and transverse processes of last thoracic (T12) and all lumbar vertebrae

insertion:
lesser trochanter of femur

Question 3

innervation of psoas major

Answer 3

ventral rami spinal nerves L1,2,3

Question 4

action of psoas major

Answer 4

flexes and laterally rotates thigh

Question 5

attachment of iliacus

Answer 5

origin:
iliac fossa

insertion:
with psoas major to lesser trochanter

Question 6

action of iliacus

Answer 6

flexion and lateral rotation of thigh

Question 7

innervation of iliacus

Answer 7

femoral nerve

-L2,3

Question 8

attachments of sartorious

Answer 8

origin:
ASIS

insertion:
medial tibial below condyle with gracilis and semitendinosus muscles at pes anserinus

Question 9

action of sartorious

Answer 9

flexes leg and rotates it medially
flexes thigh and rotates laterally
abducts lower limb when knee locked

Question 10

innervation of sartorious

Answer 10

femoral nerve

Question 11

muscles of quadriceps femoris?

Answer 11

rectus femoris
vastus lateralis
vastus medialis
vastus intermedialis

Question 12

attachments of rectus femoris?

Answer 12

origin:
straight head - AIIS
reflected head - superior brim of acetabulum

insertion:
superior surface of patella; to tibial tuberosity via patellar ligament

Question 13

action of rectus femoris?

Answer 13

flexion of thigh

extension of leg

Question 14

innervation of rectus femoris

Answer 14

femoral nerve

Question 15

attachments of vastus lateralis

Answer 15

origin:
anterolateral surface of most of femur

insertion:
lateral border of patella; to tibial tuberosity via patellar ligament

Question 16

action of vastus lateralis

Answer 16

extension of leg

Question 17

innervation of vastus lateralis

Answer 17

femoral nerve

Question 18

attachments of vastus medialis

Answer 18

origin:
anteromedial surface of most of femur

insertion:
medial border of patella; to tibial tuberosity via patellar ligament

Question 19

action of vastus medialis

Answer 19

extension of leg; assists in maintaining proper patellar tracking

Question 20

innervation of vastus medialis

Answer 20

femoral nerve

Question 21

attachments of vastus intermedius

Answer 21

origin:
most of anterior surface of femur

insertion:
deep surface of tendon of rectus femoris and other vastus muscles via aponeurosis

Question 22

action of vastus intermedius

Answer 22

extension of leg

Question 23

innervation of vastus intermedius

Answer 23

femoral nerve

Question 24

attachments of articularis genu

Answer 24

origin:
lower anterior surface of femur

insertion:
upper portion of synovial membrane of knee joint

Question 25

action of articularis genu

Answer 25

prevents synovial membrane from becoming trapped between patella and femur when leg extended

Question 26

innervation of articularis genu

Answer 26

femoral nerve

Question 27

anterior femoral muscles?

Answer 27

psoas major
iliacus
sartorius
rectus femoris
vastus lateralis
vastus intermedius
vastus medialis
articular genu

Question 28

muscles of medial femoral compartment?

Answer 28

pectinus
adductor longus
adductor brevis
adductor magnus
gracilis
obturator externus

Question 29

attachments of pectinus?

Answer 29

origin:
superior pubic ramus

insertion:
posterior femur below lesser trochanter (pectineal line of femur)

Question 30

action of pectineus?

Answer 30

adduction, flexion, assists in rotation of thigh

Question 31

innervation of pectineus?

Answer 31

femoral nerve, obturator nerve, or both

accessory obturator nerve when present

Question 32

attachments of adductor longus?

Answer 32

origin:
front of body of pubis

insertion:
middle portion of medial lip of linea aspera

Question 33

action of adductor longus?

Answer 33

adduction, flexion, assists in rotation of thigh

Question 34

innervation of adductor longus?

Answer 34

obturator nerve (anterior division)

Question 35

attachments of adductor brevis?

Answer 35

origin:
inferior pubic ramus

insertion:
upper one half of medial lip of linea aspera

Question 36

action of adductor brevis?

Answer 36

adduction, flexion, assists in rotation of thigh

Question 37

innervation of adductor brevis?

Answer 37

obturator nerve (anteiror division)

Question 38

attachments of adductor magnus?

Answer 38

origin:
ischiopubic ramus

insertion:
medial portion of femur from below lesser trochanter to adductor tubercle

Question 39

action of adductor magnus?

Answer 39

entire muscle adducts thigh
proximal - adducts and flexes, assists in rotation
distal - adducts and extends, assists in rotation

Question 40

innervation of adductor magnus?

Answer 40

proximal - obturator nerve (posterior division)

distal - tibial nerve

Question 41

adductor hiatus?

Answer 41

gap in distal attachment of adductor magnus which provide continuity between adductor canal above and popliteal fossa below

Question 42

attachments of gracilis?

Answer 42

origin:
inferior pubic ramus near symphysis

insertion:
medial surface of tibia below condyle with sartorious and semitendinosus at pes anserinus

Question 43

action of gracilis?

Answer 43

adducts thigh

flexes and medially rotates leg

Question 44

innervation of gracilis?

Answer 44

obturator nerve (anterior)

Question 45

attachments of obturator externus?

Answer 45

origin:
outer surface of obturator membrane and outer margins of obturator foramen

insertion:
trochanteric fossa

Question 46

action of obturator externus?

Answer 46

lateral rotation of thigh

Question 47

innervation of obturator externus?

Answer 47

obturator nerve (posterior division)

Question 48

what attaches at pes anserinus?

Answer 48

gracilis, sartorius, semitendinosus