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1 PNS: lower limb
Lower-limb nerves Thigh Anterior: Femoral N Medial: Obturator N Posterior: Sciatic N
Popliteal fossa Sciatic N → bifurcation
Leg Anterior: Fibular
(peroneal) N Posterior: Tibial N
Tibial nerve
Fibular nerve
Right leg
Ant. view Post. view
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2 PNS: lower limb
Nerves in leg (Anterior)
Lateral Common fibular n Deep fibular n Superficial fibular n
Medial Saphenous N (from Femoral N, sensory)
Saphenous
medial side
Right leg (ant. view)
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3 PNS: lower limb
Nerves in leg (posterior)
Common fibular N from sciatic N Tibial N Sural N (lateral)
Right leg (post. view)
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4 PNS: lower limb
Lumbar plexus
from ventral rami of L1-4; with Obturator N (L2-4) Femoral N (L2-4) Lumbosacral trunk (L4-5) Ilioinguinal (L1) Iliohypogastric (L1) Genitofemoral (L1-2) Lat. femoral cutaenous (L2-3)
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5 PNS: lower limb
Lumbar plexus
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6 PNS: lower limb
Femoral nerve
From lumbar plexus (L2-4), deep to midpoint of inguinal ligament Motor Anterior thigh muscles: Quadriceps femoris
Sensory Thigh (Anterior-Medial surface)
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7 PNS: lower limb
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8 PNS: lower limb
Obturator nerve
Lumbar plexus (L2-4) through obturator foramen Ant. br: adductor longus,
adductor brevis, gracillis, pectineus Post. br: obturator ext.,
adductor magnus Right thigh (ant. view)
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9 PNS: lower limb
Sacral plexus; Lumbosacral plexus ventral rami of S1-4; joined with lower lumbar nerves
via lumbosacral trunk Sciatic N (L4-S3) Superior gluteal N (L4-S1): gluteus med and min
(greater trochanter; abduction of hip joint) Inferior gluteal N (L5-S2): gluteus max (gluteal
tuberosity; extension, lateral rotation of hip joint) Pudendal N (S2-4) Muscular nerves Cutaneous nerves
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10 PNS: lower limb
Lumbosacral plexus
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11 PNS: lower limb
Dermatome of lower limb:
Principles: Ventral side: Lumbar Dorsal side: Sacral Genital/Perineum:
Sacral
Fig 5-12
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12 PNS: lower limb
Dermatome based on embryology
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13 PNS: lower limb
Sciatic nerve
Right leg (post. view)
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14 PNS: lower limb
Sciatic foramen: Greater and Lesser
Right hip (post. view)
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15 PNS: lower limb
Greater sciatic foramen Piriformis muscle Sciatic nerve Gluteal nerves Superior gluteal nerve Inferior gluteal nerve
Pudendal nerve (via lesser sciatic foramen to perineum)
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16 PNS: lower limb
5-23a
Sciatic nerve
Piriformis m.
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17 PNS: lower limb
Fibular (Peroneal) nerve
Muscular innervation for Leg (Anterior and Lateral compartments) Common fibular (peroneal) Deep fibular (peroneal) Plantar extension (dorsiflexion)
Superficial fibular (peroneal) Eversion
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18 PNS: lower limb
Fibular (Peroneal) nerve
Right leg (ant. view)
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19 PNS: lower limb
Deep fibular nerve Right leg (post. view)
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20 PNS: lower limb
Tibial nerve
Muscular innervation for Leg (Post. compartment) Tibial N Plantar flexion
Medial plantar N Lateral plantar N Toe flexion
Sural N: some from a branch of tibial N
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21 PNS: lower limb
Tibial nerve
Lat. plantar
Med. plantar Sural Right leg (post. view)
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22 PNS: lower limb
Skin innervation of Foot
Sural
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23 PNS: lower limb
Fibular (Peroneal) nerve injury
foot-drop (steppage gait): dragging of foot on the floor Loss in Dorsiflexion of ankle Eversion of foot Sensation of leg and foot
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24 PNS: lower limb
(ant. view)
1. Location (compartment)
2. Muscles
3. Functions
(post. view)