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ANAT3008 LECTURES > WEEK 10/1 > NERVES OF THE LOWER LIMB 1 AND 2 > Flashcards

WEEK 10/1 > NERVES OF THE LOWER LIMB 1 AND 2 Flashcards

1
Q

List the spinal cord segments

A
  • rootlets
  • dorsal root
  • dorsal root ganglion
  • spinal nerve
  • anterior primary ramus
  • posterior primary ramus
  • plexus
  • peripheral nerve
  • vertebral canal
  • intervertebral canal
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2
Q

do al peripheral nerves arise from a peripheral plexus

A

no
but some are continuation of anterior rami

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3
Q

LUMBOSACRAL PLEXUS

A
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4
Q

what does the lumbosacral plexus form from

A
  • anterior primary rami of lumber spinal cord segments 2,3,4,5
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5
Q

where is the lumbosacral plexus located

A

on the posterior wall of the abdominal cavity partly within psoas major

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6
Q

what do the anterior division in lumbosacral plexus give rise to

A

obturator nerve and the lumbosacral trunk

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7
Q

what does the posterior division of LSP give rise to

A

LCNT and femoral nerve

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8
Q

where does the femoral nerve travel on the side of

A

LATERAL

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9
Q

where does the femoral nerve travel on the side of

A

LATERAL side of psoas then enters the femoral triangle of thigh by passing under inguinal ligament

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10
Q

where is obturator nerve initially located

A

medial side of psoas then enters the pelvic caviry passing over the alar of sacrum

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11
Q

where is the lumbosacral trunk initially on

A

medial side of psoas then passes over alar of sacrum into the pelvic cavity where it joins the sacral plexus on the posterior wall

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12
Q

what does the sacral part of the plexus form

A

lumbosacral trunk and the anterior primary rami of spinal cord segments 1,2,3

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13
Q

where is the sacral part of the plexus located

A

posterior wall of the pelvic cavity anterior to piriformis muscle

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14
Q

what does the anterior division of the sacral plexus give rise to

A

tibial nerve and part of the pCNT

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15
Q

the posterior division in sacral plexus gives rise to

A

superior gluteal nerve , inferior gluteal nerve and common peroneal nerve

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16
Q

where do super/inferior gluteal nerve, and common peroneal nerve enter the lower limb via

A

gluteal region and the greater sciatic foramen

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17
Q

what are the tibial and common peroneal nerve initially joined together as

A

sciatic nerve

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18
Q

SMALLER NERVES OF THE LOWER LIMB

A
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19
Q

LCNT (lateral cutaneous. nerve of thr thigh) derives from?

A

lumbar plexus

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20
Q

what does the LCNT supply

A

the thigh

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21
Q

where do small muscular branches go to in lower limb

A

psoas major and iliacus arise from posterior division of L 23 and 24

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22
Q

what are the other cutaneous nerves

A

genitofemoral and ilionguinal

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23
Q

where does the posterior cutaneous nerve of the thigh arise from

A

sacral plexus
- cutaneous nerve supplying the posterior thigh and roof of popliteal fossa

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24
Q

nerves supplying to the gluteal region

A
  • piriformis, nerve to obturator internus, superior gemellus and quadratus femoris
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25
what does the roof of the femoral triangle include
- subcostal - genitofemoral - ilionguinal nerve
26
LARGER NERVES OF THE LOWER LIMB
- superior gluteal nerve - inferior gluteal nerve - femoral nerve - obturator nerve - tibial nerve - common peroneal nerve - superficial peroneal nerve - deep peroneal nerve
27
SUPERIOR GLUTEAL NERVE
- FORMS from the posterior division of the sacral plexus spinal cord segments L45 S1
28
where does the superior gluteal nerve leave from
- leaves the pelvic cavity via the greater sciatic foramen, above piriformis
29
what structures in the leg does superior gluteal nerve supply
- gluteus medius - gluteus minimus - tensor fascia lata
30
what is superior gluteal nerve tested by
hip joint abduction
31
INFERIOR GLUTEAL NERVE
- forms from the posterior division of sacral plexus
32
where does iGA leave pelvic cavity via
- greater sciatic foramen, below piriformis,
33
what muscle does IGA supply
gluteus maximus
34
FEMORAL NERVE
forms from the posterior division of the lumbar plexus
35
femoral nerve located
- initially lateral to psoas major in the abdominal cavity, enters the femoral triangle
36
where is the femoral nerve in the femoral triangle
- lateral to the femoral artery and outside to the femoral sheath
37
OBTURATOR NERVE
- forms from the anterior division of the lumbar plexus
38
where is obturator nerve located
- medial to psoas in the abdominal cavity it then enters the pelvic cavity
39
where does the obturator nerve exit from
- via the pelvic cavity via the obturator foramen with the obturator artery
40
where does the obturator nerve divide in the medial thigh
around adductor brevis
41
TIBIAL NERVE
FORMS from the anterior division of the sacral plexus
42
where is the tibial. nerve initially joined to
common peroneal nerve to form the sciatic nerve
43
where does the tibial nerve exit from
- exits pelvic cavity via the greater sciatic foramen below piriformis and enters the gluteal region
44
where does the tibial nerve travel from
- posterior compartment of the thigh beneath the posterior thigh muscle on the adductor magnus
45
what nerve does the tibial nerve divide from
- common peroneal nerve near the upper extent of the popliteal fossa
46
where does the tibial nerve pass through after dividing from common peroneal nerve
middle of the popliteal fossa where it gives rise to the sural branch
47
COMMON PERONEAL NERVE
Forms from the posterior division of the sacral plexus
48
what does the common peroneal nerve innervate
- short head of biceps in the thigh and gives rise to the lateral cutaneous nerve of the leg at the level of the knee
49
SUPERFICIAL PERONEAL NERVE
50
where does the superficial peroneal nerve travel
- in the lateral compartment of the leg where it supplies peroneus longus and brevis
51
what does the superficial peroneal nerve become in the mid to lower leg
- cutaneous, passes anterior to the ankle joint and onto the dorsum of the foot
52
what does the superficial peroneal nerve supply once it becomes cutaneous
skin to the mid dorsal foot
53
DEEP PERONEAL NERVE
54
where does the deep peroneal nerve travel
- in the anterior compartment of the leg on the interosseous membrane within the anterior tibial artery > supplies ALM
55
where does the deep peroneal nerve pass anterior to
ankle joint into the dorsum of the foot > which supplies the dorsal intrinsic foot muscles
56
DERMATOMES OF THE LOWER LIMB
distributes roughly down the anterior and posterior surface of the lower limb
57
where does the L1 dermatome distribute to
- upper anterior thigh including the femoral triangle
58
where does the L2 dermatome distribute to
- anterior and lateral mid thigh
59
where does the L3 dermatome distribute to
anterior and medial lower thigh
60
where does the L4 dermatome distribute to
- anterior and medial leg and big toe
61
where does the L5 dermatome distribute to
- anterior and lateral leg and toes 2,3,4
62
where does the S1 dermatome distribute to
- lateral ventral foot and toe 5 and lower posterior leg
63
where does the S2 dermatome distribute to
- S2 posterior leg and thigh including over the popliteal fossa
64
where does the S3 dermatome distribute to
- S3 gluteal region
65
MYOTOMES OF THE LOWER LIMB
distribute proximally to distally
66
sacral plexus formed from
anterior rami of spinal nerves s1-s4
67
where do most nerves leave via
pelvis inferior to the pisiformis muscle via greater sciatic foramen
68
where does superior gluteal nerve originate from
l4-s1
69
where does inferior gluteal nerve orifinate from
l5-s2
70
where does the inferior gluteal nerve enters the gluteal region via
inferiorly to the piriformis muscle
71
what muscle does inferior gluteal nerve innervate
gluteus maximus
72
components of the sciatic. nerve
tibial and fibula component
73
what does the tibial component innervate
posterior compartment of thigh except for short head of biceps femoris
74
fibular component innervates
short head of biceps femoris and anterior, lateral leg

ANAT3008 LECTURES (18 decks)

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