BOUNDARIES
? Anteriorly by anterior intermuscular septum
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which separates it from the anterior (extensor)compartment of the thigh.
? Posteriorly by posterior intermuscular septum
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(ill-defined) which separates it from posterior
(flexor) compartment of the thigh.
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? Muscles of the medial compartment of the thigh
? Pectineus
? Adductor longus
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? Gracilis? Adductor brevis
? Adductor magnus
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Anterior (first) layer pectineus, adductor longus, and gracilisMiddle (second) layer adductor brevis
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Posterior (third) layer adductor magnus
Origin and insertion of the pectineus and adductor longus
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Origin and insertion of the adductor brevis
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Origin and insertion of the adductor magnus and gracilisMuscle
Nerve supply
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ActionsPectineus Femoral nerve and
Adduction of the thigh
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obturator nerve (anterior division)
Adductor Obturator nerve (anterior division) Adduction & medial
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longusrotation of thigh
Adductor Obturator nerve (anterior and
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Adduction of thigh
brevis
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posterior divisions)Adductor Adductor part obturator nerve
Adduction and medial
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magnus
(posterior division)
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rotation of thighHamstring part tibial part of
Weak extension of hip
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sciatic nerve
joint
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GracilisObturator nerve (anterior division) Adduction of thigh
Flexion and medial
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rotation of leg
OBTURATOR NERVE
? Chief nerveadductor compartment of the thigh.
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? Arises fromlumbar plexus in the abdomen? Formed by the ventral division of the anterior
primary rami of L2, L3, L4 spinal nerves.
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? Enters the thigh by passing through the obturatorcanal.
Course
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? In the obturator canal the obturator nerve dividesinto anterior and posterior divisions.
? Anterior division passes downwards into the thigh
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in front of the obturator externus.
? Then it descends behind the pectineus and the
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adductor longus, and in front of the adductor brevis.? Posterior division enters the thigh by piercing the
anterior part of the obturator externus muscle
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? Then it descends behind the adductor brevis and in
front of the adductor magnus.
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Distribution? Anterior division
? Pectineus
? Adductor longus
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? Adductor brevis? Gracilis
? Articular twig to the hip joint
? In adductor canal:
a twig to the subsartorial plexus of nerves.
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terminates by supplying the femoral artery.Distribution cont...
? Posterior division
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? Obturator externus? Adductor magnus
? Adductor brevis
? Its terminal part forms an articular branch
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called genicular branch, to supply the kneejoint.
ACCESSORY OBTURATOR NERVE
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? Arises from the lumbar plexus.? Formed by the ventral divisions of the anterior
primary rami of L3, L4 spinal nerves
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? It crosses the superior ramus of pubis deep topectineus, which it supplies.
? An articular twig to the hip joint
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? Terminates by communicating with the anteriordivision of the obturator nerve
GLUTEAL REGION
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? The gluteal region
overlies the back and
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side, of the lateral half of
the pelvis.
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? Extent? Superiorly--iliac crest
? Inferiorly--gluteal fold
? Medially--mid-dorsal line
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and natal cleft? Laterally--anterior
superior iliac spine to the
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anterior edge of the
greater trochanter
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Cutaneous nerves of the gluteal region
Deep fascia of the gluteal region
? Attached above to the iliac crest and behind to
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the sacrum
? It splits to enclose the tensor fasciae latae and
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gluteus maximus.? Between tensor fasciae latae and gluteus
maximus is a thick fascial sheet called gluteal
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aponeurosis which covers the gluteus medius
? Laterally, the deep fascia is continuous with the
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iliotibial tract.Gluteal ligaments (sacrotuberous and sacrospinous ligaments)
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Structures passing through the greater sciatic foramen? 1.Above the piriformis:
a) Superior gluteal nerve and vessels
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? 2.Below the piriformis:
a) Inferior gluteal nerve and vessels.
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b) Sciatic nerve (most lateral structure).c) Posterior cutaneous nerve of the thigh.
d) Nerve to quadratus femoris.
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e) Pudendal nerve.
f) Internal pudendal vessels.
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g) Nerve to obturator internus? Structures passing through the lesser sciatic
foramen
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a) Tendon of obturator internus.
b) Nerve to obturator internus.
c) Internal pudendal vessels.
d) Pudendal nerve
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MUSCLES OF THE GLUTEAL REGION
? Major muscles
(a) Gluteus maximus.
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(b) Gluteus medius.(c) Gluteus minimus.
(d) Tensor fasciae latae.
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? Minor muscles(a) Piriformis
(b) Superior and inferior gemelli.
(c) Obturator internus.
(d) Quadratus femoris.
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(e) Obturator externusStructures under cover of the gluteus maximus
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MuscleNerve supply
Actions
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Gluteus maximus
Inferior gluteal nerve
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Chief extensor of the hip joint(L5; S1, S2)
Assists in getting up from sitting position
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Gluteus medius
Superior gluteal nerve
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Abductor of the hip joint(L5; S1)
Prevents the sagging of pelvis on the
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unsupported side
Gluteus minimus
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Superior gluteal nerveAbductor of the hip joint
Tensor fasciae latae Superior gluteal nerve
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Supports the femur on tibia during
standing position
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PiriformisVentral rami of S1, S2
Lateral rotator of the thigh at hip joint*
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Gemellus superior
Nerve to obturator
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*internus (L5; S1, S2)
Gemellus inferior
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Nerve to quadratus
*
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femoris (L4; L5, S1)Obturator internus
Nerve to obturator
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*
internus
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Quadratus femorisNerve to quadratus
*
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femoris (L4; L5, S1)
SUPERIOR GLUTEAL ARTERY
? Branch of the posterior division of internal iliac
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artery.
? Divides Superficial and Deep branches
? Superficial branchbetween gluteus medius and
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maximus, and supplies both of them.
? Deep branchbetween gluteus medius and
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minimus? subdivides into upper and lower branches
? Upper branch-- spinous anastomosis (ASIS)
? Lower branch-- trochanteric anastomosis
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INFERIOR GLUTEAL ARTERY
? Branch of anterior division of the internal iliac artery.
? Branches:
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i)Muscular branches to the adjacent muscles.ii)Anastomotic branches to cruciate and trochanteric
anastomoses.
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iii)Artery to sciatic nerveTRENDELENBURG'S SIGN
? The gluteus medius and minimus prevent the
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unsupported side of the pelvis from sagging duringwalking
? When the gluteus medius and minimus of one side
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are paralyzed due to injury of the superior gluteal
nerve.
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? The pelvis sags on the healthy side if that foot is offthe ground.
? As a result, the person walks with a lurching gait
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Intramuscular injection in gluteal region
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