CUTANEOUS NERVES
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Lateral cutaneous n. of theSaphenous n. (br. of
calf (br. of common peroneal
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post. div. of femoral
nerve) supplies the skin on
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nerve)the upper part of the
supplies the skin on the
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anterolateral surface of the
anteromedial surface of
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leg.the leg
Superficial peroneal n. (br. of
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Deep peroneal n. (br. of
common peroneal nerve)
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common peroneal nerve)supplies the skin of the lower
supplies the skin of the
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part of the anterolateral
adjacent sides of the big
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surface of the leg and dorsumand second toes
of the foot
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Digital branches. (br. of
Sural n. (br. of tibial n)
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tibial n) Curve up andsupplies the skin of the
supply the distal part of
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lateral border of the foot upto
dorsum of toes.
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the tip of the little toe.Med. Plantar n.-3 ? toes
Lat. Plantar n.-1 ? toes
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Veins present in superficial fascia of legDorsal venous arch lies over proximal
part of metatarsals, and receives 4
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dorsal metatarsal veins formed by unionof 2 digital dorsal veins.
Great saphenous vein formed by union
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of medial end of dorsal venous arch withmedial marginal vein
Small/ Short saphenous vein formed
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by union of lateral end of dorsal venousarch with lateral marginal vein
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SKELETON OF FOOT
Deep fascia of leg
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Anterior
Anterior
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intermuscularcompartment
septum
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Lateral
Interosseous
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compartmentmembrane
Posterior
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Posterior
compartment
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intermuscularseptum
Replaced by periosteum at subcutaneous areas.
Forms intermuscular septae to form three
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compartmentsRetinacula
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Deep fascia is thickened toform bands.
Retain tendons in place.
?Superior Extensor
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Retinaculum? Inferior Extensor
Retinaculum
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?Superior PeronealRetinaculum
? Inferior Peroneal
Retinaculum
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Contents of the anterior compartment
o Muscles:
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1. Tibialis anterior2. Extensor
digitorum longus
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3. Extensor hallucis
longus
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4. Peroneus tertiusContents of the anterior compartment
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o Anteriortibial artery
o Deep
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peroneal
nerve.
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TIBIALIS ANTERIOROrigin:
?Upper two- thirds of the
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lateral surface of theshaft of tibia.
?Adjacent interosseous
membrane.
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TIBIALIS ANTERIOR
Insertion:
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?Infero-medial side of
the base of the first
metatarsal bone.
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?Adjacent medialcuneiform bone.
TIBIALIS ANTERIOR
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Nerve Supply:Deep Peroneal nerve.
Actions:
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?Dorsiflexion of foot at theankle joint.
?Maintains medial
longitudinal arch.
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?Inversion of foot at mid-
tarsal and sub-talar joints.
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EXTENSOR HALLUCIS LONGUSOrigin:
?Middle 2/4 of the medial
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surface of the shaft of fibulamedial to the origin of
extensor digitorum longus.
?Adjacent interosseous
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membrane.EXTENSOR HALLUCIS LONGUS
Insertion:
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?The tendon crosses in front
of anterior tibial vessels and
deep peroneal nerve from
lateral to medial side.
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?Base of the terminal phalanx
of great toe.
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EXTENSOR HALLUCIS LONGUSNerve supply:
Deep Peroneal nerve
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Actions:?Dorsiflexion of the great toe.
?Stretches the plantar
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aponeurosis.?Increases the concavity of
the medial longitudinal arch.
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EXTENSOR DIGITORUM LONGUSOrigin:
?Upper three-fourths of the
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medial surface of the shaftof fibula.
?A small area of lateral tibial
condyle.
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?Interosseous membrane.
?Anterior intermuscular
septum.
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EXTENSOR DIGITORUM LONGUS
Insertion:
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?Tendon divides into four
digital slips for insertion
into lateral four toes.
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?The slips join laterally withthe three digital slips of
extensor digitorum brevis
to form the dorsal digital
expansion.
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EXTENSOR DIGITORUM LONGUS
Nerve Supply:
Deep peroneal nerve
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Actions:
?Dorsiflexion of foot at the
ankle joint.
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?Dorsiflexion of lateral four
toes.
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PERONEUS TERTIUSOrigin:
?Lower one-fourth of the
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medial surface of the shaft offibula in continuity with the
origin of extensor digitorum
longus.
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?Adjacent inerosseousmembrane.
PERONEUS TERTIUS
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Insertion:?Dorsal surface of the base of
the fifth metatarsal bone.
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Nerve Supply:Deep Peroneal nerve
Actions:
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?Dorsiflexion of foot at theankle joint.
?Weak evertor of the foot.
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Superior Extensor
Retinaculum
Lateral: lower part of
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subcutaneous anteriorborder of fibula.
Medial: anterior border of
tibia above the medial
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malleolus.Encloses tendon of
Tibialis anterior.
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Inferior Extensor
Retinaculum
Stem: upper surface of
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calcaneus anterior tosulcus calcanei.
encloses tendons of
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Peroneus tertius &Extensor digitorum longus.
Upper limb: Tibial
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malleolus.encloses tendons of
Extensor hallucis longus &
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Tibialis anterior.Lower limb: blends with
Plantar aponeurosis.
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arches over tendonsof Extensor hallucis
longus & Tibialis anterior.
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ANTERIORTIBIAL ARTERY
It arises at the lower
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border of popliteus.The artery passes
forwards between
two heads of tibialis
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posterior andappears on the
interosseus
membrane through
an oval gap in it.
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ANTERIOR
TIBIAL ARTERY
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In the lower part it
lies over tibia midway
between the two
malleoli.
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It terminates as
dorsalis pedis artery
distal to the ankle.
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Branches :
1. Posterior tibial
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recurrent artery.2. Anterior tibial
recurrent artery.
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3. Muscular branches.
4. Medial malleolar
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artery.5. Lateral malleolar
artery.
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Deep peroneal
nerve
It arises from the
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bifurcation ofcommon peroneal
nerve lateral to neck
of fibula.
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Spirals around thefibular neck, pierces
anterior
intermuscular
septum.
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Lies deep to Extensor
digitorum longus
over interosseus
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membrane lateral totibial vessels.
Branches :
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1. Muscularbranches.
2. Articular
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branches to
ankle joint.
Common peroneal nerve
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Peroneus longus
Deep peroneal nerve
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Tibialis AnteriorExtensor Digitorium Longus
Extensor Hallucis Longus
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Superficial
Peroneal nerve
Lateral branch of Deep
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peroneal nerve to ExtensorMedial branch to skin of 1st
Digitorium Brevis
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interdigital cleft
EXTENSOR DIGITORUM BREVIS
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Origin:
? Anterior part of the upper
surface of calcaneus.
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? Stem of inferior extensor
retnaculum.
EXTENSOR DIGITORUM BREVIS
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Insertion:? Muscle divides into four tendons
for insertion into medial four toes.
? Most medial tendon is known as
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Extensor hallucis brevis. It isinserted separately into base of
proximal phalanx of great toe.
? The other three tendons join with
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the dorsal digital expansion of thesecond to fourth toes and get
inserted into the bases of middle
and distal phalanges.
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EXTENSOR DIGITORUM BREVIS
Nerve supply:
By a pseudoganglion from lateral
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terminal branch of deep peronealnerve.
Actions:
Dorsifexion of medial four toes in
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dorsiflexed foot.DORSALIS PEDIS ARTERY
Begins infront of ankle between
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two malleoli.Passes forward to the medial
side of the dorsum into the gap
between two heads of first
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dorsal interosseous muscle.Enters the sole and forms
plantar arch by joining with the
deep branch lateral plantar
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artery.DORSALIS PEDIS ARTERY
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Branches:?Lateral tarsal artery.
?Medial tarsal artery.
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?Arcuate artery
?First dorsal metatarsal
artery.
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DEEP PERONEAL NERVE
Present lateral to dorsalis pedis in
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the foot between the tendon ofextensor hallucis longus and first
tendon of extensor digitorum
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longus.
DEEP PERONEAL NERVE
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LATERAL BRANCH
?Extensor digitorium brevis
?Tarsal joints
?2nd Dorsal Interosseus muscle
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MEDIAL BRACH-
?1st Dorsal Interosseus muscle
?Proximal joint of great toe
?Skin of 1st interdigital cleft
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APPLIED ANATOMY
1. Foot Drop- Paralysis of anterior compartment muscles
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2. Dorsalis pedis artery- Pulse felt between tendons ofExtensor hallucis longus andfirst tendon of extensor
digitorum longus.
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3. Anterior Tibial compartment syndrome4. Nerve entrapments in deep fascia
Saphenous nerve
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Superficial Peroneal nerve