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Download MBBS Medial Side of the Thigh Lecture PPT

Download MBBS (Bachelor of Medicine and Bachelor of Surgery) Latest Medial Side of the Thigh Lecture PPT

This post was last modified on 30 November 2021


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 gracilis


Middle (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 gracilis
Muscle

Nerve supply

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Actions

Pectineus 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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longus

rotation 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 thigh

Hamstring part tibial part of

Weak extension of hip

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sciatic nerve

joint

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Gracilis

Obturator 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 obturator

canal.
Course

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? In the obturator canal the obturator nerve divides

into 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 knee

joint.
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 to

pectineus, which it supplies.

? An articular twig to the hip joint

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? Terminates by communicating with the anterior

division 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 externus



Structures under cover of the gluteus maximus

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Muscle

Nerve 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 nerve

Abductor 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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Piriformis

Ventral 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 femoris

Nerve 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 nerve
TRENDELENBURG'S SIGN

? The gluteus medius and minimus prevent the

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unsupported side of the pelvis from sagging during

walking

? 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 off

the ground.

? As a result, the person walks with a lurching gait

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Intramuscular injection in gluteal region

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