Download MBBS Anatomy PPT 83 Anterior Compartment And Dorsum Gk Notes

Download MBBS (Bachelor of Medicine, Bachelor of Surgery) Human Anatomy ppt lectures Topic 83 Anterior Compartment And Dorsum Gk Notes. - anatomy ppt free download human anatomy ppt lectures, medicine notes ppt, anatomy handwritten notes pdf, mbbs 1st year anatomy notes pdf download, best anatomy notes pdf, human anatomy notes pdf, anatomy easy notes pdf, anatomy notes online, anatomy short notes, Anatomy ppt, Powerpoint Presentations and lecture notes.




CUTANEOUS NERVES

Lateral cutaneous n. of the

Saphenous n. (br. of

calf (br. of common peroneal

post. div. of femoral

nerve) supplies the skin on

nerve)

the upper part of the

supplies the skin on the

anterolateral surface of the

anteromedial surface of

leg.

the leg

Superficial peroneal n. (br. of

Deep peroneal n. (br. of

common peroneal nerve)

common peroneal nerve)

supplies the skin of the lower

supplies the skin of the

part of the anterolateral

adjacent sides of the big

surface of the leg and dorsum

and second toes

of the foot

Digital branches. (br. of

Sural n. (br. of tibial n)

tibial n) Curve up and

supplies the skin of the

supply the distal part of

lateral border of the foot upto

dorsum of toes.

the tip of the little toe.

Med. Plantar n.-3 ? toes
Lat. Plantar n.-1 ? toes

Veins present in superficial fascia of leg

Dorsal venous arch lies over proximal

part of metatarsals, and receives 4
dorsal metatarsal veins formed by union
of 2 digital dorsal veins.

Great saphenous vein formed by union

of medial end of dorsal venous arch with
medial marginal vein

Small/ Short saphenous vein formed

by union of lateral end of dorsal venous
arch with lateral marginal vein





SKELETON OF FOOT

Deep fascia of leg

Anterior

Anterior

intermuscular

compartment

septum

Lateral

Interosseous

compartment

membrane

Posterior

Posterior

compartment

intermuscular
septum

Replaced by periosteum at subcutaneous areas.
Forms intermuscular septae to form three
compartments


Retinacula

Deep fascia is thickened to
form bands.
Retain tendons in place.

?Superior Extensor
Retinaculum

? Inferior Extensor
Retinaculum

?Superior Peroneal
Retinaculum

? Inferior Peroneal
Retinaculum

Contents of the anterior compartment

o Muscles:

1. Tibialis anterior

2. Extensor

digitorum longus

3. Extensor hallucis

longus

4. Peroneus tertius


Contents of the anterior compartment

o Anterior

tibial artery

o Deep

peroneal

nerve.

TIBIALIS ANTERIOR

Origin:

?Upper two- thirds of the
lateral surface of the
shaft of tibia.

?Adjacent interosseous
membrane.


TIBIALIS ANTERIOR

Insertion:

?Infero-medial side of
the base of the first
metatarsal bone.

?Adjacent medial
cuneiform bone.

TIBIALIS ANTERIOR

Nerve Supply:
Deep Peroneal nerve.

Actions:

?Dorsiflexion of foot at the
ankle joint.

?Maintains medial
longitudinal arch.

?Inversion of foot at mid-
tarsal and sub-talar joints.


EXTENSOR HALLUCIS LONGUS

Origin:

?Middle 2/4 of the medial
surface of the shaft of fibula
medial to the origin of
extensor digitorum longus.

?Adjacent interosseous
membrane.

EXTENSOR HALLUCIS LONGUS

Insertion:

?The tendon crosses in front
of anterior tibial vessels and
deep peroneal nerve from
lateral to medial side.

?Base of the terminal phalanx
of great toe.


EXTENSOR HALLUCIS LONGUS

Nerve supply:
Deep Peroneal nerve

Actions:

?Dorsiflexion of the great toe.

?Stretches the plantar
aponeurosis.

?Increases the concavity of
the medial longitudinal arch.

EXTENSOR DIGITORUM LONGUS

Origin:

?Upper three-fourths of the
medial surface of the shaft
of fibula.

?A small area of lateral tibial
condyle.

?Interosseous membrane.

?Anterior intermuscular
septum.


EXTENSOR DIGITORUM LONGUS

Insertion:

?Tendon divides into four
digital slips for insertion
into lateral four toes.

?The slips join laterally with
the three digital slips of
extensor digitorum brevis
to form the dorsal digital
expansion.

EXTENSOR DIGITORUM LONGUS

Nerve Supply:
Deep peroneal nerve

Actions:

?Dorsiflexion of foot at the
ankle joint.

?Dorsiflexion of lateral four
toes.


PERONEUS TERTIUS

Origin:

?Lower one-fourth of the
medial surface of the shaft of
fibula in continuity with the
origin of extensor digitorum
longus.

?Adjacent inerosseous
membrane.

PERONEUS TERTIUS

Insertion:

?Dorsal surface of the base of
the fifth metatarsal bone.

Nerve Supply:
Deep Peroneal nerve

Actions:

?Dorsiflexion of foot at the
ankle joint.

?Weak evertor of the foot.


Superior Extensor
Retinaculum

Lateral: lower part of
subcutaneous anterior
border of fibula.

Medial: anterior border of
tibia above the medial
malleolus.

Encloses tendon of

Tibialis anterior.

Inferior Extensor
Retinaculum

Stem: upper surface of
calcaneus anterior to
sulcus calcanei.

encloses tendons of

Peroneus tertius &
Extensor digitorum longus.


Upper limb: Tibial
malleolus.

encloses tendons of

Extensor hallucis longus &
Tibialis anterior.

Lower limb: blends with
Plantar aponeurosis.

arches over tendons

of Extensor hallucis
longus & Tibialis anterior.

ANTERIOR

TIBIAL ARTERY

It arises at the lower
border of popliteus.

The artery passes
forwards between
two heads of tibialis
posterior and
appears on the
interosseus
membrane through
an oval gap in it.


ANTERIOR

TIBIAL ARTERY

In the lower part it
lies over tibia midway
between the two
malleoli.

It terminates as
dorsalis pedis artery
distal to the ankle.


Branches :

1. Posterior tibial

recurrent artery.

2. Anterior tibial

recurrent artery.

3. Muscular branches.

4. Medial malleolar

artery.

5. Lateral malleolar

artery.

Deep peroneal
nerve

It arises from the
bifurcation of
common peroneal
nerve lateral to neck
of fibula.

Spirals around the
fibular neck, pierces
anterior
intermuscular
septum.


Lies deep to Extensor
digitorum longus
over interosseus
membrane lateral to
tibial vessels.

Branches :

1. Muscular

branches.

2. Articular

branches to
ankle joint.

Common peroneal nerve

Peroneus longus

Deep peroneal nerve

Tibialis Anterior

Extensor Digitorium Longus

Extensor Hallucis Longus

Superficial
Peroneal nerve

Lateral branch of Deep
peroneal nerve to Extensor

Medial branch to skin of 1st

Digitorium Brevis

interdigital cleft


EXTENSOR DIGITORUM BREVIS

Origin:

? Anterior part of the upper
surface of calcaneus.

? Stem of inferior extensor
retnaculum.

EXTENSOR DIGITORUM BREVIS
Insertion:
? Muscle divides into four tendons
for insertion into medial four toes.

? Most medial tendon is known as
Extensor hallucis brevis. It is
inserted separately into base of
proximal phalanx of great toe.

? The other three tendons join with
the dorsal digital expansion of the
second to fourth toes and get
inserted into the bases of middle
and distal phalanges.


EXTENSOR DIGITORUM BREVIS

Nerve supply:
By a pseudoganglion from lateral
terminal branch of deep peroneal
nerve.

Actions:
Dorsifexion of medial four toes in
dorsiflexed foot.

DORSALIS PEDIS ARTERY

Begins infront of ankle between
two malleoli.

Passes forward to the medial
side of the dorsum into the gap
between two heads of first
dorsal interosseous muscle.

Enters the sole and forms
plantar arch by joining with the
deep branch lateral plantar
artery.


DORSALIS PEDIS ARTERY

Branches:

?Lateral tarsal artery.

?Medial tarsal artery.

?Arcuate artery

?First dorsal metatarsal
artery.

DEEP PERONEAL NERVE

Present lateral to dorsalis pedis in

the foot between the tendon of

extensor hallucis longus and first

tendon of extensor digitorum

longus.


DEEP PERONEAL NERVE

LATERAL BRANCH
?Extensor digitorium brevis
?Tarsal joints
?2nd Dorsal Interosseus muscle

MEDIAL BRACH-
?1st Dorsal Interosseus muscle
?Proximal joint of great toe
?Skin of 1st interdigital cleft

APPLIED ANATOMY

1. Foot Drop- Paralysis of anterior compartment muscles

2. Dorsalis pedis artery- Pulse felt between tendons of

Extensor hallucis longus andfirst tendon of extensor
digitorum longus.

3. Anterior Tibial compartment syndrome

4. Nerve entrapments in deep fascia

Saphenous nerve
Superficial Peroneal nerve

This post was last modified on 05 April 2022