Muscles of the Shoulder Flashcards Preview

Muscles - Origin, Insertion & Action > Muscles of the Shoulder > Flashcards

Flashcards in Muscles of the Shoulder Deck (18)
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1
Q

Rotator Cuff Group

A
  • Supraspinatus
  • Infraspinatus
  • Teres Minor
  • Subscapularis
2
Q
A

Supraspinatus

Origin

  • Supraspinous Fossa of the Scapula

Insertion

  • Greater Tubercle of the Humerus (Superior Facet)

Action

  • Initiate abduction of the humerus
  • Stabilization of the glenohumeral joint
3
Q
A

Infraspinatus

Origin

  • Infraspinous Fossa of the Scapula

Insertion

  • Greater Tubercle of the Humerus (Middle Facet)

Action

  • Lateral rotation of the humerus
  • Assists in extension of the humerus
  • Stabilization of the glenohumeral joint
4
Q
A

Teres Minor

Origin

  • Axillary Border of the Scapula

Insertion

  • Greater Tubercle of the Humerus (Inferior Facet)

Action

  • Lateral rotation of the humerus
  • Assists in extension of the humerus
  • Stabilization of the glenohumeral joint
5
Q
A

Subscapularis

Origin

  • Subscapular Fossa of the Scapula

Insertion

  • Lesser Tubercle of the Humerus

Action

  • Medial rotation of the humerus
  • Stabilization of the glenohumeral joint
6
Q
A

Pectoralis Major

Origin

  • Pectoralis Major Clavicular Portion - Medial Clavicle
  • Pectoralis Major Sternal Portion - Sternum and Upper 6 Ribs

Insertion

  • Both Portions - Lateral Lip of the Bicipital Groove

Action

  • Medial rotation of the humerus
  • Flexion of the glenohumeral joint
  • Horizontal flexion of the glenohumeral joint
  • Assists in adduction of the humerus
  • Lower Fibers - Extension from a flexed position if there is resistance to movement
7
Q
A

Latissimus Dorsi

Origin

  • Thoracolumbar Aponeurosis
  • Vertebrae T7-L5
  • Sacrum
  • Crest of the Ilium
  • Inferior Angle of the Scapula

Insertion

  • Bicipital Groove

Action

  • Medial rotation of the humerus at the glenohumeral joint
  • Extension of the humerus at the glenohumeral joint
  • Adduction of the humerus at the glenohumeral joint
  • Depression of the scapula
  • Assists in lateral flexion of the trunk
  • Assists in extension of the trunk when the arms are stabilized (hanging)
8
Q
A

Teres Major

Origin

  • Inferior Angle of the Scapula

Insertion

  • Medial Lip of the Bicipital Groove

Action

  • Medial rotation of the humerus at the glenohumeral joint
  • Adduction of the humerus at the glenohumeral joint
  • Extension of the humerus at the glenohumeral joint
9
Q
A

Deltoids

Origin

  • Anterior Portion - Lateral Third of the Clavicle
  • Lateral Portion - Acromion Process
  • Posterior Portion - Spine of the Scapula

Insertion

  • All Portions - Deltoid Tuberosity

Action

  • Anterior Portion - Flexion of the humerus AND Medial rotation of the humerus
  • Posterior Portion - Extension of the humerus AND Lateral rotation of the humerus
  • All Portions - Abduction of the humerus at the glenohumeral joint
10
Q
Reversed
  • Supraspinatus
  • Infraspinatus
  • Teres Minor
  • Subscapularis
A

Rotator Cuff Group

11
Q
Reversed

Supraspinatus

Origin

  • Supraspinous Fossa of the Scapula

Insertion

  • Greater Tubercle of the Humerus (Superior Facet)

Action

  • Initiate abduction of the humerus
  • Stabilization of the glenohumeral joint
A
12
Q
Reversed

Infraspinatus

Origin

  • Infraspinous Fossa of the Scapula

Insertion

  • Greater Tubercle of the Humerus (Middle Facet)

Action

  • Lateral rotation of the humerus
  • Assists in extension of the humerus
  • Stabilization of the glenohumeral joint
A
13
Q
Reversed

Teres Minor

Origin

  • Axillary Border of the Scapula

Insertion

  • Greater Tubercle of the Humerus (Inferior Facet)

Action

  • Lateral rotation of the humerus
  • Assists in extension of the humerus
  • Stabilization of the glenohumeral joint
A
14
Q
Reversed

Subscapularis

Origin

  • Subscapular Fossa of the Scapula

Insertion

  • Lesser Tubercle of the Humerus

Action

  • Medial rotation of the humerus
  • Stabilization of the glenohumeral joint
A
15
Q
Reversed

Pectoralis Major

Origin

  • Pectoralis Major Clavicular Portion - Medial Clavicle
  • Pectoralis Major Sternal Portion - Sternum and Upper 6 Ribs

Insertion

  • Both Portions - Lateral Lip of the Bicipital Groove

Action

  • Medial rotation of the humerus
  • Flexion of the glenohumeral joint
  • Horizontal flexion of the glenohumeral joint
  • Assists in adduction of the humerus
  • Lower Fibers - Extension from a flexed position if there is resistance to movement
A
16
Q
Reversed

Latissimus Dorsi

Origin

  • Thoracolumbar Aponeurosis
  • Vertebrae T7-L5
  • Sacrum
  • Crest of the Ilium
  • Inferior Angle of the Scapula

Insertion

  • Bicipital Groove

Action

  • Medial rotation of the humerus at the glenohumeral joint
  • Extension of the humerus at the glenohumeral joint
  • Adduction of the humerus at the glenohumeral joint
  • Depression of the scapula
  • Assists in lateral flexion of the trunk
  • Assists in extension of the trunk when the arms are stabilized (hanging)
A
17
Q
Reversed

Teres Major

Origin

  • Inferior Angle of the Scapula

Insertion

  • Medial Lip of the Bicipital Groove

Action

  • Medial rotation of the humerus at the glenohumeral joint
  • Adduction of the humerus at the glenohumeral joint
  • Extension of the humerus at the glenohumeral joint
A
18
Q
Reversed

Deltoids

Origin

  • Anterior Portion - Lateral Third of the Clavicle
  • Lateral Portion - Acromion Process
  • Posterior Portion - Spine of the Scapula

Insertion

  • All Portions - Deltoid Tuberosity

Action

  • Anterior Portion - Flexion of the humerus AND Medial rotation of the humerus
  • Posterior Portion - Extension of the humerus AND Lateral rotation of the humerus
  • All Portions - Abduction of the humerus at the glenohumeral joint
A