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A Review of the Shoulder Muscles and Their Actions. What muscle works closely with the anterior deltoid? Pectoralis major What muscle is involved in any lifting movements? Deltoid What is the major (strongest) extensor muscle? Latissimus Dorsi Name the four rotator cuff muscles.

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questions
What muscle works closely with the anterior deltoid?

Pectoralis major

What muscle is involved in any lifting movements?

Deltoid

What is the major (strongest) extensor muscle?

Latissimus Dorsi

Name the four rotator cuff muscles.

Subscapularis, Supraspinatus, Infraspinatus, and Teres minor.

What muscle works closely with the infraspinatus?

Teres minor

Questions
practice
Name the muscles for Horizontal Adduction

Pect Major (both)

Corachobrachialis

Deltoid (anterior)

Name the muscles for Horizontal Abduction

Deltoid (post)

Infraspinatus

Teres minor

Lats

Practice
practice1
List the muscles that do flexion of the shoulder

Coracobrachialis

Pectoralis major (upper to 60°)

Anterior Deltoid

Practice
  • List the muscles that do extension of the shoulder
  • Latissimus dorsi
  • Teres major
  • Posterior deltoid
  • Pectoralis major (lower fibers to neutral)
practice2
List the muscles that do adduction of the shoulder

Pectoralis major (lower and upper below 90°)

Coracobrachialis

Latissimus dorsi

Teres major

Practice

List the muscles that do abduction of the shoulder

  • Deltoid (all sections)
  • Supraspinatus
  • Pectoralis major (upper past 90°)
practice3
List the muscles that do internal rotation of the shoulder

Subscapularis

Latissimus dorsi

Teres major

Anterior deltoid

Pect. major

Practice
  • List the muscles that do external rotation of the shoulder
  • Infraspinatus
  • Teres minor
  • Posterior deltoid
slide7

Name the muscle.

Coracobrachialis

Name the action

Adduction of the shoulder

Also, flexion and hor. add.

slide8

Name the muscle.

Pectoralis Major

slide9

Name the muscle.

Subscapularis

Name the action

Internal rotation of the shoulder

slide10

Name the muscle.

Deltoid

Name the action

Abduction of shoulder

slide11

Name the muscle.

Infraspinatus

Name the action

External rotation

slide12

Name the action

Name the muscle.

Adduction of scapula

Teres Major

slide13

Name the muscle.

Teres Minor

Name the action if the humerus move directly to the posterior

Extension of the shoulder

slide14

Name the muscle.

Supraspinatus

Name the action

Abduction of the shoulder

slide15

Coracobrachialis

Pect. Major

Subscapularis

Deltoid

slide16

Supraspinatus

Teres Major

Infraspinatus

Teres Minor

slide18

What position is his right shoulder in?

Horizontal Abduction and

External Rotation

slide19

What rotation action is his shoulder performing as he continues to through the ball?

Internal Rotation

slide21

What position are his shoulders in?

Horizontal abduction or Extension

slide22

Position of their shoulders?

2.

1.

Extension

Flexion

major muscles of the shoulder
Pectoralis major

Push-ups

Pull-ups

Bench press

Throwing

Tennis serve

Latissimus dorsi

Chinning

Robe climb

Dips on parallel bars

Pullover exercises

Pulldown exercises

Rowing

Major Muscles of the Shoulder
slide26

Shoulder action = ?

Shoulder muscle(s) = ?

Deltoid

Supraspinatus

Abduction

slide27

Shoulder action = ?

Shoulder muscle(s) = ?

Flexion

Ant Deltoid

Upper Pect Major

Coracobrach.

slide28

Shoulder action = ?

Shoulder muscle(s) = ?

Ant. Deltoid

Pect. Major (both)

Coracobrachialis

Horizontal Add.

slide29

Shoulder action = ?

Shoulder muscle(s) = ?

Horizontal Abduction

Latissimus Dorsi

Post. Deltoid

Teres Minor

Infraspinatus

slide30

Shoulder action = ?

Shoulder muscle(s) = ?

Adduction

Pect. Major (both)

Coracobrachialis

Latissimus Dorsi

Teres Major

slide31

Shoulder action = ?

Shoulder muscle(s) = ?

Horizontal Add

Ant. Deltoid

Pect. Major (both)

Coracobrachialis

slide32

Shoulder action = ?

Shoulder muscle(s) = ?

Extension

Lats Teres Major

Post. Deltoid Pectoralis Major (lower)

Infraspinatus Teres minor

slide33

Shoulder action = ?

Shoulder muscle(s) = ?

External Rotation

Infrspinatus

Teres Minor

Post. Deltoid

name a shoulder muscle isolated with the following exercises
Name a shoulder muscle isolated with the following exercises.
  • Side arm dumbbell raises
  • Deltoid
  • Push-ups
  • Pectoralis major
  • Rowing and pull-overs
  • Latissimus dorsi
what is the action to the left what muscles perform that action
What is the action to the left? What muscles perform that action?

External Rotation

Internal Rotation

Internal Rotation

Subscapularis, Ant. Deltoid, Pect, Major, Lats. And Teres Major

rotator cuff exercises
Rotator Cuff Exercises

External Rotation

Internal Rotation

External Rotation

Abduction (to work the supraspinatus)

shoulder related injuries
Shoulder Related Injuries
  • The shoulder is built for motion, not stability
  • Injury rate depends on…
    • Shallowness of glenoid fossa
    • Laxity of ligaments
    • Strength of muscles
slide38
Shoulder subluxation
    • Incomplete or partial dislocation
  • Shoulder dislocation
    • Complete dislocation of the GH joint
    • Most common anteriorly and inferiorly
  • Shoulder separation
    • Complete dislocation of the AC joint
impingement syndrome1
Impingement Syndrome
  • A condition that decreases the subacromial space
    • Acromion process
    • Coracoacromial ligament
  • Causes
    • Swelling
    • Bone spurs
    • Anatomical structure 
rotator cuff
Rotator cuff
  • Subscapularis
  • Supraspinatus
  • Infraspinatus
  • Teres minor
movement of rc muscles
Movement of RC Muscles
  • Subscapularis is an internal rotator of the arm.
  • Supraspinatus assists the deltoid in abducting the arm, with its greatest contribution being the initiation of abduction.
  • Infraspinatus and teres minor muscles both externally rotate the arm.
rotator cuff injury
Rotator Cuff Injury
  • The throwing motion has been divided into five phases: wind-up, cocking, acceleration, and follow-through.
  • Cocking phase
    • Subscapularis fires in late cocking phase to decelerate the shoulder's external rotation. Also, it is stretched during the cocking phase.
rotator cuff injury1
Rotator Cuff Injury
  • Follow-through (muscles fire most intensely)
    • Subscapularis internally rotates the shoulder,
    • The infraspinatus and teres minor contract eccentrically to decelerate the arm and are stretched.
  • During this repetitive eccentric loading, the rotator cuff is prone to overload, fatigue, tendinitis, and even a partial undersurface tear.
slide49

Note: Surgery needs to be performed within 3 months or the supraspinatus muscle will atrophy and be too short to reattach

labral tear
Labral Tear
  • The glenoid cavity makes up the “socket” of the shoulder joint. 
  • The labrum acts sort of like a gasket, turning the flat surface of the glenoid into a deeper socket that molds to the head of the humerus for a better fit.
  • A tear of labrum can cause pain and a catching sensation with movement of the shoulder. 
labral tear1
Labral Tear
  • Most labral tears are probably the result of an injury to the shoulder, such as falling on an outstretched hand. 
  • There is reason to believe that the excess motion of the humerus moving around on the glenoid may cause damage to the labrum over time.  
  • An unstable shoulder may also cause injury to the labrum, if it repeatedly dislocates out of the glenoid.