Term
| Name three muscles that have a primary role in shoulder flexion |
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Definition
- the anterior fibers of the deltoid muscle
- upper fibers of the pectoralis major
- Biceps Brachii
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Term
| Name three muscles that have a primary role in shoulder extension |
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Definition
- Deltoid-posterior fibers
- Latissimus dorsi
- Teres Major
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Term
| What is the primary muscle involved in horizontal abduction of the shoulder? |
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Definition
| Deltoid (posterior fibers) |
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Term
| What are the two primary muscles involved in the adduction of the shoulder? |
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Definition
- Deltoid (anterior fibers)
- pectoralis major (upper fibers)
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Term
| Which two muscles are responsible for abduction of the shoulder? |
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Definition
1. Deltoid (all fibers)
2. Supraspinatus |
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Term
| List the three muscles that are most involved in the adduction of the shoulder. |
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Definition
1. Latissimus dorsi
2. Teres Major
3. Infraspinatus |
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Term
| List the three muscles that are invovled in lateral rotation of the shoulder. |
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Definition
1. Deltoid (posterior fibers)
2. infraspinatus
3. teres minor |
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Term
| Which three muscles are the most invovled in the medial rotation of the shoulder? |
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Definition
1. Deltoid (anterior fibers)
2. Latissimus dorsi
3. teres major |
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Term
| What are the rotator cuff muscles? |
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Definition
1. Supraspinatus
2. Infraspinatus
3. Teres minor
4. Subscapularis |
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Term
| The teres major and the teres minor both originate from the scapula and insert on the humerus, yet they have opposite actions in terms of rotation of the shoulder, why is this? |
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Definition
| The teres major inserts on the medial surface of the humerus, causing it to have a medial rotation effect when contracting. The teres minor inserts on the posterior aspect of the greater tubercle, causing a lateral rotation effect when the muscle contracts. |
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Term
| What are the basic origin and insertions of the deltoid? |
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Definition
origin: lateral one-third of the clavicle, acromion process and spine of the scapula
insertion: deltoid tuberosity |
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Term
| what is the innervation of the deltoid muscle? |
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Definition
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