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Z MD1 Hip and leg anatomy > nerves of lower limb > Flashcards

Flashcards in nerves of lower limb Deck (60):
0

two plexuses of the lower limb

sacral and lumbar

1

where is the lumbar plexus

within the substance of psoas major muscle

2

which ventral rami form the lumbar plexus

L1-4

3

what are the 3 divisions emerging from the lateral surfae of the lumbar plexus as they emerge from psoas

- iliohypogastric and ilioinguinal nerves (ilioinguinal is like a branch of iliohypogastric) - lateral cutaneous nerve of thigh - femoral nerve

4

which ventral rami contribute to the iliohypogastric and ilioinguinal nerves

L1

5

what is the sensory innervation of the ilioinguinal and iliohypogastric nerves

cutaneous supply of the skin over the inguinal region and the front of the scrotum

6

what is the motor innervation of the iliohypogastric and ilioinguinal nerves

- the lowermost fibres of internal oblique and transversus abddominus

7

which ventral rami contribute to the lateral cutaneous nerve of thigh

L2 and L3

8

what is the sensory innervation of the lateral cutaneous nerve of thigh

supplies the skin of the lateral part of the thigh

9

route of the lateral cutaneous nerve of thigh

emerge from the lateral border of psoas major and onto iliacus --> beneath the inguinal ligament and into the anterior compartment of the thigh

10

which ventral rami contribute to the femoral nerve

L2,3,4

11

onto what surface does the femoral nerve go onto of the thigh

the anterior compartment

12

which nerve of the lumbar plexus emerges from the anterior surface of psoas

genitofemoral nerve

13

which ventral rami contribute to the genitofemoral nerve

L1,2

14

what does the femoral branch of the genitofemoral nerve supply

sensory supply to the area of skin immediately beneath the middle of the inguinal ligament

15

what does the genital branch of the genitofemoral nerve supply

the sensory supply to the spermatic cord

16

which nerve of the lumbar plexus emerges from the medial border of psoas

obturator

17

which ventral rami contribute to the obturator nerve

L2,3,4

18

what are all the nerves of the lumbar plexus

iliohypogastric and ilioinguinal nerves lateral cutaneous nerve of thigh femoral nerve genitofemoral nerve obturator nerve

19

which nerves contribute to the sacral plexus

S1-4 (and also what is left of L4 and L5)

20

where is the sacral plexus

formed on the surface of piriformis on the posterior wall of the pelvis

21

what is the motor innervation of the femoral nerve

to quads, sartorius and pectineus (muscles of the anterior thigh)

22

what is the sensory innervation of femoral nerve

- anteromedial thigh (via anterior cutaneous branches) - medial side of knee, leg and ankle (saphenus nerve)

23

what other innervation, other than sensory and motor, does the femoral nerve do

articular branches to hip and knee

24

what is the positioning of the femoral nerve as it passes beneath the inguinal ligament and into the anterior compartment of the thigh

it is lateral to vascular structures, OUTSIDE the femoral sheath

25

where abouts does the femoral nerve branch into its terminal branches

about 2.5cm below the inguinal ligament

26

which group of muscles does the obturator nerve supply

the adductor muscles (medial)

27

describe the route of the obturator nerve

emerges from medial border of psoas --> drops onto lateral wall of pelvis --> through obturator canal --> medial compartment of thigh

28

which muscles specifically does the obturator nerve supply

adductor longus and brevis - via anterior division adductor magnus and gracilis - via posterior division and pectineus

29

where is the sensory innervation of the obturator nerve

sensory to inferomedial thigh (just above the medial side of knee)

30

what other supply does the obturator nerve do apart from sensory and motor

articular branches to hip

31

which two branches of the sacral plexus contribute to the innervation of the leg

posterior cutaneous nerve of thigh sciatic nerve

32

what is the supply of the posterior cutaneous nerve of thigh

sensory supply over the back of the thigh

33

what are the two "components" of the sciatic nerve

tibial nerve common fibular nerve

34

what is the route of the sciatic nerve through the leg

exits pelvis via greater sciatic foramen --> emerges beneath piriformis, onto the posterior of the hip joint --> descends in the posterior thigh under biceps femoris and on obturator internus and gemeli --> divides into terminal branches at the apex of the popliteal fossa

35

which type of hip dislocation can take out the sciatic nerve

posterior

36

what is the motor innervation of the sciatic nerve

to the hamstrings (via the tibial component of sciatic nerve - apart from SHOB)

37

what articular branches does the sciatic nerve give

articular branches to hip

38

which rami contribute to the tibial nerve

L4-5, S1-3

39

the tibial nerve is the nerve of which compartment of the leg

the posterior compartment (calf - flexors)

40

what is the route of the tibial nerve

continues the vertical descent of sciatic nerve through the popliteal fossa behind the knee joint --> beneath fibrous arch of Soleus --> descends between the superficial and deep muscles of the calf on tibialis posterior --> posterior to medial malleolus --> sole of foot --> divides into medial and lateral plantar nerves

41

what is the motor innervation of the tibial nerve

the to posterior muscles of the leg

42

what is the sensory innervation of the tibial nerve

posterior leg and lateral side of foot - sural nerve sole of foot - medial calcaneal, medial and lateral plantar nerves

43

which part of the sole of the foot is supplied by the saphenous nerve

very medial part

44

what is the route of the common fibular nerve

remains next to (medially) biceps femoris --> superficial to lateral head of gastrocnemius on route --> winds around the neck of fibula --> into substance of fibularis longus --> divides into terminal branches (deep and superficial fibular nerves)

45

if you take out the common fibular nerve what is the sign

"Foot drop"

46

what is the motor innervation of the common fibular nerve

nothing

47

what is the sensory innervation of the common fibular nerve

- sensory to upper lateral leg via sural cutaneous nerve - gives communicating branch to sural nerve (from tibial nerve)

48

which nerve roots contribute to the common fibular nerve

L4-5, S1-2 (no S3)

49

the common fibular nerve is the nerve of which compartment

the anterior compartment of the leg (extensors)

50

two divisions of the common fibular nerve

deep and superficial fibular nerves

51

route of the deep fibular nerve

begins in substance of fibularis longus --> descends deep to EDL, anterior to interosseous membrane --> beneath extensor retinaculum -> dorsum of the foot --> between toe cleft of 1st and 2nd toes

52

motor innervation of deep fibular nerve

anterior compartment of the leg - tibialis anterior, EDL, EHL extensor digitorum brevis (on dorsum of the foot)

53

what is the sensory innervation of the deep fibular nerve

sensory to the skin between the 1st and 2nd toes

54

what is the motor innervation of the superficial fibular nerve

lateral compartment of the leg - fibularis longus and brevis

55

what is the sensory innervation of the superficial fibular nerve

lower lateral leg and dorsum of the foot (sparing the first web space)

56

explain the innervation of the muscles in the gluteal region

superior gluteal nerve - supplies gluteus minimus and medius inferior gluteal nerve supplies gluteus maximus

57

which nerves innervate the anterior, medial and posterior compartments of the thigh

anterior - femoral medial - obturator posterior - sciatic nerve

58

how do you get a dermatomal or myotomal disruption to the lower limb

disruption of the nerves at the root level

59

what are the roots of the superior and inferior gluteal nerves

superior - L5,5,S1 - emerges above piriformis inferior - L5, S1,2 - emerges below piriformis