3. Inguinal ligament
• Fibrous band extending from the
anterior superior iliac spine to the
pubic tubercle.
• It is an important anatomical
landmark and denotes the
transition of the pelvis to the
lower limb.
12. Actions of Muscles of AAW
• Support and protect abdominal viscera
• Forceful expiratory acts
• Movements of trunk
– Flexion of trunk (lumbar spine)
– Lateral flexion of trunk
– Rotation of trunk
• Act as accessory muscles of respiration
• Expulsive acts eg defacation
• Suspension of testis
• Tensing the linea alba
17. Gluteus Maximus
• Origin: Fascia covering gluteus
medius, ilium, fascia of erector spinae,
sacrum, lateral, coccyx, sacrotuberous
ligament
• Insertion: Iliotibial tract &
gluteal tuberosity of femur
• Nerve supply: Inferior gluteal nerve
(L5,S1,S2)
• Action: Extension, lateral rotation
and abduction of hip
• Applied Anatomy: Its a site for
intramuscular drug injection
18. Injection given in the Upper Outer Quadrant of the gluteus maximus
muscle to avoid pricking the sciatic nerve
51. MUSCLES OF ANTERIOR
COMPARTMENT OF LEG
TIBIALIS ANTERIOR
EXTENSOR HALLUCIS LONGUS
EXTENSOR DIGITORUM LONGUS
PERONEUS TERTIUS
EXTENSOR DIGITORUM BREVIS
52. TIBIALIS ANTERIOR
ORIGIN : Tibia :- lateral condyle U2/3 lateral surface of shaft
Inter osseous membrane
INSERTION : Medial cuneiform :- infro medial surface
1st MT :- Base
N/S : Deep peroneal nerve
ACTION : Dorsiflexion at foot
Inverter of foot
Maintain medial
longitudinal arch of foot
53. EXT HALLUCIS LONGUS
ORIGIN : Fibula :-middle 2/4 shaft post surface
INSERTION : Distal phalynx of great toe :-Dorsal
surface
N/S : Deep peroneal nerve
ACTION : Dorsi flexion of foot
Extensin of MTP ,
Keep leg verticle while walking on
uneven ground
54. EXTENSOR DIGITORIUM LONGUS
ORIGIN : Tibia :- Lateral condyle
Fibula :- U ¼ whole side
Middle :- anterior half
Interosseous membrane
INSERTION : Middle and distal phalanges of 2nd and
5th toe
Muscle divide into 4 tendons for 2ndto
5th toe
Each tendon is joined on lateral side by
tendon of ext digitobrevis and form
dorsal digital expantion
N/S : Deep peroneal nerve
ACTION : Dorsiflexion of foot
Extends MTP ,IP5 of 2nd and 5th toe
55. PERONEUS TERTIUS
ORIGIN : Fibula :- L/4 medial surface shaft
INSERTION : 5th MT - medial surface of dorsal
surface
N/S : Deep peroneal nerve
ACTION : Dorsiflexion and inverter of foot
56. EXTENSOR DIGITORIUM BREVIS
ORIGIN
INSERTION
N/S :
ACTION :
: Calcaneus anterior surface
: Proximal phalynx of 1st - 4th toes
Muscle divides into 4 tendons for medial
4th toe
medial most part of muscle called as
extensor hallucis brevis
Lateral 3 tendons join lateral side of EDL
for dorsal digital expansion of 2nd ,3RD ,4th
toe
Deep peroneal nerve
EHB :- Extends MTP of great toe
Other extends MTP ,IP5 OF
2ND ,3RD,4TH toes
57. 2 MUSCLES OF LATERAL SIDE OF LEG
PERONEUS LONGUS
PERONEUS BREVIS
58. PERONEUS LONGUS
ORIGIN : Fibula :- Head of fibula
Lateral surface of shaft
Medial 1/3 of fibula
INSERTION
same as T.ant
N/S
ACTION
: Medial cuneaform
1st MT
: Superior peroneal nerve
: Evertor of foot
Maintains lateral longitdinal
transerve arch
62. GASTROCNEMIUS
ORIGIN : Medial Head :- medial condyle of femur
popliteal surface of femur
capsule of knee joint
Lateral head :- lateral condyle of femur
lateral supracondylar line
capsule of knee
INSERTION : Calcaneous :- Tendons of gastrocnemius fuses
with soleus for tendon achilis
inserted on M/3 of posteior
surface of calcaneous
N/S : Tibial nerve S1,S2
ACTION : Plantar flexion foot imp for walking
Flexor of knee
63. SOLEUS
ORIGIN : Tibia :- soleal line and m/3 of post surface of shaft
Fibula :- Base of head
U/4 post surface of shaft
INSERTION : Calcaneous:- Tendon of gastorcnemus
fuses with tendon of soleus form tendon
achillis inserted on M/3 of posteior
surface of calcaneous
N/S : Tibial nerve S1/S2
ACTION : PLANOR FLEXION OF FOOT
64. PLANTARIS
ORIGIN : FEMUR : Lateral condyle
Oblique popliteal line
INSERTION : Calcaneous:- posteior surface of
calcaneum medial to TA
N/S : Tibial nerve S1/S2
ACTION : Plantar is rudimentary
Accessory to gastrocnemeus
Importance of
65. DEEP MUSCLES OF BACK OF LEG
. POPLITEUS
. FLEXOR HALLUCIS LONGUS
. FLEXOR DIGITORUM LONGUS
. TIBIALIS POSTERIOR
66. POPLITEUS
ORIGIN : Femur :- Lateral condyle
Lateral meniscus
INSERTION : Tibia :- post surface shaft
of tibia above
soleal line
N/S : Tibial nerve
ACTION : Unlocking of knee by lateral
rotations of femur on tibia
bigining of flexion
67. FlEXOR HALLUCIS LONGUS
ORIGIN : Fibula :- lower ¾ post surface
INSERTION : Distal phalynx of big toe
N/S : Tibial nerve
ACTION : Flexion of distal phalnx of
great toe
68. FLEXOR DIGITORIUM LONGUS
ORIGIN : Tibia :-U/3post surface below soleal line
INSERTION : Distal phalanx of 2nd -5th toe
Muscle divides into 4 tendons for lateral
4 toes
N/S : Tibial nerve
ACTOIN : Flexor of digital phalanx 2-5th toes
Plantar flexon of foot at ankle
69. TIBIALIS POSTERIOR
ORIGIN : Tibia :- u2/3 posterior surface below soleal line
Fibula :- Posterior surface of fibula
INSERTION : Tuberosity of navicular bone and tarsal bones
except talus
Insert extends to 2nd ,3rd,4th,MT at base
N/S : Tibial nerve
ACTION : Plantar flexion at ankle
Inversion at foot at subtalar joint
Maintains medial longitudinal arch
