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ANATOMICAL PULLEYS
BY: AJAY KUMAR & SYED MASOOD
PULLEYS:
 A pulley is a simple mechanical machine
and consists of a wheel that turns readily
on an axle.
 The wheel is usually grooved for a rope or
a wire cable.
ANATOMICAL PULLEYS:
 In the human body, in most cases the
pulley is replaced by a bone, cartilage or
ligament and the cord is replaced by a
muscle tendon.
 The tendon is lubricated in a manner so
that it may easily slide over the pulley.
ANATOMICAL PULLEYS:
 The fibers of a muscle or a muscle tendon
wrap around a bone or are deflected by a bone
prominence.
 When the direction of pull is altered, the bone
or bony prominence causing the deflection
forms an anatomical pulley.

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The document defines the Q-angle as the angle formed between a line from the ASIS to the midpoint of the patella and a line from the midpoint of the patella to the tibial tubercle. It represents the angle of pull of the quadriceps muscles. The normal range is 10-14 degrees for men and 15-23 degrees for women. Factors that can increase the Q-angle include muscle imbalances, tight iliotibial bands, genu valgum, medial femoral torsion, and lateral tibial rotation.

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ppt
Functions of a pulley:
 Redirect force to make task easier.
 It makes task easier by deflecting the action
line of a muscle away from the joint axis, thus
inc the MA for a muscle force.
PULLEYS OF HAND:
 The skeletal structure of the hand and fingers
is a set of rigid bones. Consequently, it takes
great muscular control to perform the fine
movements of the hand. Without this highly
specialized level of control, we would have
serious challenges performing all kinds of
activities from simply grasping an object to the
detailed motor control required to play a
musical instrument or writing.
PULLEYS OF HAND:
 A unique biomechanical pulley system
provides the high level of control necessary to
move the rigid finger bones with precision. The
flexor tendons of the fingers run along the
anterior surface of the fingers, and these
tendons are tethered close to the bones by
connective tissue "pulleys" at eight different
locations from the metacarpophalangeal
(MCP) joint to the distal phalanx.
PULLEYS OF HAND:
 Because the tendons are closely tethered to
the bones, their pulling force is more efficient.
Let's take a look at these pulleys, how they
work and what happens when they don't.

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PULLEYS OF HAND:
 There are mainly two types of
pulleys in the hand:
 Annular Pulleys( five in number).
 Cruciate pulleys or connective
tissue pulleys(three in number).
Annular pulleys:
 There are five annular pulleys in the fingers,
and they are named A1 through A5.
 The A1, A3, and A5 pulleys are smaller and
considered minor pulleys
(mostly due to size and
lack of importance).
Annular pulleys:
 The A2 and A4 pulleys are larger and are
sometimes called the major pulleys.
 The A1, A3, and A5 pulleys are located at the
MCP, PIP and DIP joints respectively.
 The A2 and A4 pulleys are located in the
middle of the proximal and middle phalanx
respectively
Damage to annular pulleys:
 The annular pulleys may be damaged from an
acute injury or from various degenerative
conditions in the fingers.
 An example of the detrimental effect of rupture
of the annular pulleys is shown in Figure.

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This document discusses relaxation techniques. It defines relaxation as a state where muscle tension and mental stress are reduced through conscious effort. Relaxation can be general, involving the whole body, or local, targeting specific muscle groups. Several factors like muscle tone, posture, movement, and mental state can affect relaxation. Techniques to achieve general relaxation include assuming supported, comfortable positions and creating a restful atmosphere. Specific techniques discussed are autogenic training, progressive muscle relaxation, and the contrast method, which involve sequentially contracting and relaxing different muscle groups.

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This document discusses prehension, or gripping, which is made possible by the opposable thumb in humans. It describes two main types of grip: power grip, which involves the whole hand and is used to hold cylindrical or spherical objects, and precision grip, which requires finer motor control and pad-to-pad, tip-to-tip, or pad-to-side contact between the thumb and fingers. Specific grips like hook, spherical, and lateral grips are subtypes of power grip. Precision grips depend on intact sensation and muscles like the flexor pollicis brevis and opponens pollicis. The functional position of the wrist and fingers optimizes power and efficiency of grip.

physotherapy
Damage to annular pulleys:
 In this image, the A3 pulley has been
completely ruptured and there is a partial
rupture to the A2 pulley. As a result, the tendon
is pulled away from the PIP joint, in what is
referred to as a bowstringing effect.
 With the tendon pulled away from the PIP joint,
its power is reduced and it is no longer able to
produce normal range of motion. As a result,
the hand is significantly weaker in gripping
activities.
Cruciate pulleys:
 A second set of connective-tissue pulleys,
called cruciate pulleys, gives additional
support and stability to the tendon sheaths.
 The term cruciate means cross, and you can
see by their structure where they get their
name.
 The cruciate pulleys are much smaller than the
annular pulleys. There are three cruciate
pulleys, designated as C1, C2, and C3.
Cruciate pulleys:
 Their role for improving the flexor tendon's
angle of pull is not as great, so if they are
damaged, finger movement is not impaired as
much as with the annular pulleys.

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ANATOMICAL PULLEYS.ppt

  • 1. ANATOMICAL PULLEYS BY: AJAY KUMAR & SYED MASOOD
  • 2. PULLEYS:  A pulley is a simple mechanical machine and consists of a wheel that turns readily on an axle.  The wheel is usually grooved for a rope or a wire cable.
  • 3. ANATOMICAL PULLEYS:  In the human body, in most cases the pulley is replaced by a bone, cartilage or ligament and the cord is replaced by a muscle tendon.  The tendon is lubricated in a manner so that it may easily slide over the pulley.
  • 4. ANATOMICAL PULLEYS:  The fibers of a muscle or a muscle tendon wrap around a bone or are deflected by a bone prominence.  When the direction of pull is altered, the bone or bony prominence causing the deflection forms an anatomical pulley.
  • 5. Functions of a pulley:  Redirect force to make task easier.  It makes task easier by deflecting the action line of a muscle away from the joint axis, thus inc the MA for a muscle force.
  • 6. PULLEYS OF HAND:  The skeletal structure of the hand and fingers is a set of rigid bones. Consequently, it takes great muscular control to perform the fine movements of the hand. Without this highly specialized level of control, we would have serious challenges performing all kinds of activities from simply grasping an object to the detailed motor control required to play a musical instrument or writing.
  • 7. PULLEYS OF HAND:  A unique biomechanical pulley system provides the high level of control necessary to move the rigid finger bones with precision. The flexor tendons of the fingers run along the anterior surface of the fingers, and these tendons are tethered close to the bones by connective tissue "pulleys" at eight different locations from the metacarpophalangeal (MCP) joint to the distal phalanx.
  • 8. PULLEYS OF HAND:  Because the tendons are closely tethered to the bones, their pulling force is more efficient. Let's take a look at these pulleys, how they work and what happens when they don't.
  • 9. PULLEYS OF HAND:  There are mainly two types of pulleys in the hand:  Annular Pulleys( five in number).  Cruciate pulleys or connective tissue pulleys(three in number).
  • 10. Annular pulleys:  There are five annular pulleys in the fingers, and they are named A1 through A5.  The A1, A3, and A5 pulleys are smaller and considered minor pulleys (mostly due to size and lack of importance).
  • 11. Annular pulleys:  The A2 and A4 pulleys are larger and are sometimes called the major pulleys.  The A1, A3, and A5 pulleys are located at the MCP, PIP and DIP joints respectively.  The A2 and A4 pulleys are located in the middle of the proximal and middle phalanx respectively
  • 12. Damage to annular pulleys:  The annular pulleys may be damaged from an acute injury or from various degenerative conditions in the fingers.  An example of the detrimental effect of rupture of the annular pulleys is shown in Figure.
  • 13. Damage to annular pulleys:  In this image, the A3 pulley has been completely ruptured and there is a partial rupture to the A2 pulley. As a result, the tendon is pulled away from the PIP joint, in what is referred to as a bowstringing effect.  With the tendon pulled away from the PIP joint, its power is reduced and it is no longer able to produce normal range of motion. As a result, the hand is significantly weaker in gripping activities.
  • 14. Cruciate pulleys:  A second set of connective-tissue pulleys, called cruciate pulleys, gives additional support and stability to the tendon sheaths.  The term cruciate means cross, and you can see by their structure where they get their name.  The cruciate pulleys are much smaller than the annular pulleys. There are three cruciate pulleys, designated as C1, C2, and C3.
  • 15. Cruciate pulleys:  Their role for improving the flexor tendon's angle of pull is not as great, so if they are damaged, finger movement is not impaired as much as with the annular pulleys.