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Muscles of the Shoulder
Muscles of the shoulder
12
Anatomy
Graduate
06/03/2015

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Cards

Term
Name three muscles that have a primary role in shoulder flexion
Definition
  1. the anterior fibers of the deltoid muscle
  2. upper fibers of the pectoralis major
  3. Biceps Brachii
Term
Name three muscles that have a primary role in shoulder extension
Definition
  1. Deltoid-posterior fibers
  2. Latissimus dorsi
  3. Teres Major
Term
What is the primary muscle involved in horizontal abduction of the shoulder?
Definition
Deltoid (posterior fibers)
Term
What are the two primary muscles involved in the adduction of the shoulder?
Definition
  1. Deltoid (anterior fibers)
  2. pectoralis major (upper fibers)
Term
Which two muscles are responsible for abduction of the shoulder?
Definition

1. Deltoid (all fibers)

2. Supraspinatus

Term
List the three muscles that are most involved in the adduction of the shoulder.
Definition

1. Latissimus dorsi

2. Teres Major

3. Infraspinatus

Term
List the three muscles that are invovled in lateral rotation of the shoulder.
Definition

1. Deltoid (posterior fibers)

2. infraspinatus

3. teres minor

Term
Which three muscles are the most invovled in the medial rotation of the shoulder?
Definition

1. Deltoid (anterior fibers)

2. Latissimus dorsi

3. teres major

Term
What are the rotator cuff muscles?
Definition

1. Supraspinatus

2. Infraspinatus

3. Teres minor

4. Subscapularis

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?
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.
Term
What are the basic origin and insertions of the deltoid?
Definition

origin: lateral one-third of the clavicle, acromion process and spine of the scapula

insertion: deltoid tuberosity

Term
what is the innervation of the deltoid muscle?
Definition
axillary nerve
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