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

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)

3 PNS: lower limb

Nerves in leg (posterior)

Common fibular N from sciatic N Tibial N Sural N (lateral)

Right leg (post. view)

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)

5 PNS: lower limb

Lumbar plexus

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)

7 PNS: lower limb

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)

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

10 PNS: lower limb

Lumbosacral plexus

11 PNS: lower limb

Dermatome of lower limb:

Principles: Ventral side: Lumbar Dorsal side: Sacral Genital/Perineum:

Sacral

Fig 5-12

12 PNS: lower limb

Dermatome based on embryology

13 PNS: lower limb

Sciatic nerve

Right leg (post. view)

14 PNS: lower limb

Sciatic foramen: Greater and Lesser

Right hip (post. view)

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)

16 PNS: lower limb

5-23a

Sciatic nerve

Piriformis m.

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

18 PNS: lower limb

Fibular (Peroneal) nerve

Right leg (ant. view)

19 PNS: lower limb

Deep fibular nerve Right leg (post. view)

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

21 PNS: lower limb

Tibial nerve

Lat. plantar

Med. plantar Sural Right leg (post. view)

22 PNS: lower limb

Skin innervation of Foot

Sural

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

24 PNS: lower limb

(ant. view)

1. Location (compartment)

2. Muscles

3. Functions

(post. view)