Shoulder and Arm

Question 1

These are the actions for which muscle?

All Fibers:
1. ABduct the shoulder

Anterior Fibers:
1. Flex the shoulder
2. Medially rotate the shoulder
3. Horizontally adduct the shoulder

Posterior Fibers:
1. Extend the shoulder
2. Laterally rotate the shoulder
Horizontally ABduct the shoulder

Origin: Lateral one-third of clavicle, acromion, and spine of scapula

Insertion: Deltoid tuberosity

Answer 1

Deltoid

Origin: Lateral one-third of clavicle, acromion, and spine of scapula

Insertion: Deltoid tuberosity

Question 2

What are the actions for the Deltoid?

Origin: Lateral one-third of clavicle, acromion, and spine of scapula

Insertion: Deltoid tuberosity

Answer 2

All Fibers:
1. ABduct the shoulder

Anterior Fibers:
1. Flex the shoulder
2. Medially rotate the shoulder
3. Horizontally adduct the shoulder

Posterior Fibers:
1. Extend the shoulder
2. Laterally rotate the shoulder
Horizontally ABduct the shoulder

Origin: Lateral one-third of clavicle, acromion, and spine of scapula

Insertion: Deltoid tuberosity

Question 3

List the functions for the Deltoid

Origin: Lateral one-third of clavicle, acromion, and spine of scapula

Insertion: Deltoid tuberosity

Answer 3

All Fibers:
1. ABduct the shoulder

Anterior Fibers:
1. Flex the shoulder
2. Medially rotate the shoulder
3. Horizontally adduct the shoulder

Posterior Fibers:
1. Extend the shoulder
2. Laterally rotate the shoulder
Horizontally ABduct the shoulder

Origin: Lateral one-third of clavicle, acromion, and spine of scapula

Insertion: Deltoid tuberosity

Question 4

These are the functions for which muscle

Upper fibers Bilaterally:
1. Extend the head and neck

Upper fibers Unilaterally:
1. Laterally flex the head and neck to the same side
2. Rotate the head and neck to the opposite side
3. Elevate the scapula
4. Upwardly rotate the scapula

Middle fibers:
1. Adduct the scapula
2. Stabilize the scapula

Lower fibers:
1. Depress the scapula
2. Upwardly rotate the scapula

Origin: External occipital protuberance, medial portion of superior nuchal line of the occiput, ligamentum nuchae, and spinous processes of C-7 through T-12

Insertion: Lateral one-third of clavicle, acromion, and spine of the scapula

Answer 4

Trapezius

Origin: External occipital protuberance, medial portion of superior nuchal line of the occiput, ligamentum nuchae, and spinous processes of C-7 through T-12

Insertion: Lateral one-third of clavicle, acromion, and spine of the scapula

Question 5

List the actions for the Trapezius

Origin: External occipital protuberance, medial portion of superior nuchal line of the occiput, ligamentum nuchae, and spinous processes of C-7 through T-12

Insertion: Lateral one-third of clavicle, acromion, and spine of the scapula

Answer 5

Upper fibers Bilaterally:
1. Extend the head and neck

Unilaterally:
1. Laterally flex the head and neck to the same side
2. Rotate the head and neck to the opposite side
3. Elevate the scapula
4. Upwardly rotate the scapula

Middle fibers:
1. Adduct the scapula
2. Stabilize the scapula

Lower fibers:
1. Depress the scapula
2. Upwardly rotate the scapula

Origin: External occipital protuberance, medial portion of superior nuchal line of the occiput, ligamentum nuchae, and spinous processes of C-7 through T-12

Insertion: Lateral one-third of clavicle, acromion, and spine of the scapula

Question 6

What are the actions for the Trapezius

Origin: External occipital protuberance, medial portion of superior nuchal line of the occiput, ligamentum nuchae, and spinous processes of C-7 through T-12

Insertion: Lateral one-third of clavicle, acromion, and spine of the scapula

Answer 6

Upper fibers Bilaterally:
1. Extend the head and neck

Unilaterally:
1. Laterally flex the head and neck to the same side
2. Rotate the head and neck to the opposite side
3. Elevate the scapula
4. Upwardly rotate the scapula

Middle fibers:
1. Adduct the scapula
2. Stabilize the scapula

Lower fibers:
1. Depress the scapula
2. Upwardly rotate the scapula

Origin: External occipital protuberance, medial portion of superior nuchal line of the occiput, ligamentum nuchae, and spinous processes of C-7 through T-12

Insertion: Lateral one-third of clavicle, acromion, and spine of the scapula

Question 7

What two muscles work together to perform these actions?

1. Extend the shoulder
2. Adduct the shoulder
3. Medially rotate the shoulder

Answer 7

Latissimus Dorsi and Teres Major

Latissimus Dorsi:
Origin: Inferior angle of scapula, spinous processes of last six thoracic vertebrae, last three or four ribs, thoracolumbar fascia, and posterior iliac crest

Insertion: Intertubercular groove of the humerus

Teres Major:
Origin: Inferior angle and lower one-third of lateral border of the scapula

Insertion: Crest of the lesser tubercle of the humerus

Question 8

List the functions of the Latissimus Dorsi and Teres Major

Latissimus Dorsi:
Origin: Inferior angle of scapula, spinous processes of last six thoracic vertebrae, last three or four ribs, thoracolumbar fascia, and posterior iliac crest

Insertion: Intertubercular groove of the humerus

Teres Major:
Origin: Inferior angle and lower one-third of lateral border of the scapula

Insertion: Crest of the lesser tubercle of the humerus

Answer 8

1. Extend the shoulder
2. Adduct the shoulder
3. Medially rotate the shoulder

Question 9

What are the actions of the Latissimus Dorsi and Teres Major

Latissimus Dorsi:
Origin: Inferior angle of scapula, spinous processes of last six thoracic vertebrae, last three or four ribs, thoracolumbar fascia, and posterior iliac crest

Insertion: Intertubercular groove of the humerus

Teres Major:
Origin: Inferior angle and lower one-third of lateral border of the scapula

Insertion: Crest of the lesser tubercle of the humerus

Answer 9

1. Extend the shoulder
2. Adduct the shoulder
3. Medially rotate the shoulder