Muscles of the Shoulder Flashcards
1
Q
Rotator Cuff Group
A
- Supraspinatus
- Infraspinatus
- Teres Minor
- Subscapularis
2
Q
![](https://s3.amazonaws.com/brainscape-prod/system/cm/308/696/038/q_image_thumb.jpeg?1586967173)
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
![](https://s3.amazonaws.com/brainscape-prod/system/cm/308/696/038/a_image_thumb.jpeg?1586967160)
3
Q
![](https://s3.amazonaws.com/brainscape-prod/system/cm/308/696/196/q_image_thumb.jpeg?1586967339)
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
![](https://s3.amazonaws.com/brainscape-prod/system/cm/308/696/196/a_image_thumb.jpeg?1586967315)
4
Q
![](https://s3.amazonaws.com/brainscape-prod/system/cm/308/696/319/q_image_thumb.jpeg?1586967462)
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
![](https://s3.amazonaws.com/brainscape-prod/system/cm/308/696/319/a_image_thumb.jpeg?1586967448)
5
Q
![](https://s3.amazonaws.com/brainscape-prod/system/cm/308/696/409/q_image_thumb.jpeg?1586967586)
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
![](https://s3.amazonaws.com/brainscape-prod/system/cm/308/696/409/a_image_thumb.jpeg?1586967574)
6
Q
![](https://s3.amazonaws.com/brainscape-prod/system/cm/308/696/659/q_image_thumb.jpeg?1586967806)
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
![](https://s3.amazonaws.com/brainscape-prod/system/cm/308/696/659/a_image_thumb.jpeg?1586967781)
7
Q
![](https://s3.amazonaws.com/brainscape-prod/system/cm/308/696/832/q_image_thumb.jpeg?1586968098)
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)
![](https://s3.amazonaws.com/brainscape-prod/system/cm/308/696/832/a_image_thumb.jpeg?1586968082)
8
Q
![](https://s3.amazonaws.com/brainscape-prod/system/cm/308/697/781/q_image_thumb.jpeg?1586968721)
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
![](https://s3.amazonaws.com/brainscape-prod/system/cm/308/697/781/a_image_thumb.jpeg?1586968707)
9
Q
![](https://s3.amazonaws.com/brainscape-prod/system/cm/308/697/826/q_image_thumb.jpeg?1586968851)
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
![](https://s3.amazonaws.com/brainscape-prod/system/cm/308/697/826/a_image_thumb.jpeg?1586968838)
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
![](https://s3.amazonaws.com/brainscape-prod/system/cm/308/697/991/q_image_thumb.jpeg?1586968908)
A
![](https://s3.amazonaws.com/brainscape-prod/system/cm/308/697/991/a_image_thumb.jpeg?1586968908)
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
![](https://s3.amazonaws.com/brainscape-prod/system/cm/308/697/993/q_image_thumb.jpeg?1586968909)
A
![](https://s3.amazonaws.com/brainscape-prod/system/cm/308/697/993/a_image_thumb.jpeg?1586968909)
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
![](https://s3.amazonaws.com/brainscape-prod/system/cm/308/697/994/q_image_thumb.jpeg?1586968910)
A
![](https://s3.amazonaws.com/brainscape-prod/system/cm/308/697/994/a_image_thumb.jpeg?1586968910)
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
![](https://s3.amazonaws.com/brainscape-prod/system/cm/308/697/998/q_image_thumb.jpeg?1586968911)
A
![](https://s3.amazonaws.com/brainscape-prod/system/cm/308/697/998/a_image_thumb.jpeg?1586968911)
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
![](https://s3.amazonaws.com/brainscape-prod/system/cm/308/697/999/q_image_thumb.jpeg?1586968912)
A
![](https://s3.amazonaws.com/brainscape-prod/system/cm/308/697/999/a_image_thumb.jpeg?1586968912)