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Exercise 20 . C. Descriptions Describe the location of each of the following muscles. 1. triceps brachii 2. infraspinatus 3. teres minor 4. biceps brachii 5. supraspinatus 6. brachialis 7. coracobrachialis 8. teres major 9. deltoid : Locatcd pper most part 10. subscapularis D. Short-Answer Questions 1. Describe the muscles involved in turning the hand, as when twisting a doorknob back

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1. Triceps Brachii: The triceps brachii is located on the back of the upper arm.

2. Infraspinatus: The infraspinatus muscle is located on the posterior aspect of the scapula (shoulder blade).

3. Teres Minor: The teres minor is also located on the posterior aspect of the scapula, just below the infraspinatus.

4. Biceps Brachii: The biceps brachii is located on the front of the upper arm.

5. Supraspinatus: The supraspinatus muscle is situated on the upper part of the scapula, above the spine of the scapula.

Explanation:

1. Triceps Brachii: The triceps brachii is a large muscle located on the posterior (back) side of the upper arm. It consists of three heads: the long head, lateral head, and medial head. These heads work together to extend the elbow joint, allowing you to straighten your arm.

Explanation:

2. Infraspinatus: The infraspinatus muscle is one of the four muscles that make up the rotator cuff, and it is situated on the posterior aspect (back) of the scapula (shoulder blade). This muscle is responsible for the external rotation and stabilization of the shoulder joint.

Explanation:

3. Teres Minor: Like the infraspinatus, the teres minor is also part of the rotator cuff and is located on the posterior aspect of the scapula, just below the infraspinatus. It plays a role in the external rotation of the shoulder joint and helps with shoulder stability.

Explanation:

4. Biceps Brachii: The biceps brachii is a prominent muscle on the front of the upper arm. It consists of two heads (hence "biceps"): the long head and the short head. The biceps flexes the elbow joint, allowing you to bend your arm, and also assists in some forearm movements.

Explanation:

5. Supraspinatus: The supraspinatus muscle is located on the upper part of the scapula, above the spine of the scapula. It is another component of the rotator cuff and is involved in the initial lifting of the arm away from the body (abduction) and in shoulder stability.

Step 2/2

6. Brachialis: The brachialis muscle is deep to the biceps brachii and is located on the front of the upper arm.

7. Coracobrachialis: The coracobrachialis muscle is located in the front of the upper arm, near the shoulder.

8. Teres Major: The teres major is a muscle of the upper arm and shoulder and is located on the back side of the upper arm, close to the teres minor.

9. Deltoid: The deltoid muscle forms the rounded contour of the shoulder and covers the shoulder joint.

10. Subscapularis: The subscapularis muscle is situated on the anterior surface of the scapula, underneath it.

Explanation:

6. Brachialis: The brachialis muscle is a deep muscle located underneath the biceps brachii on the front of the upper arm. It plays a crucial role in elbow flexion, allowing you to bend your arm at the elbow joint. Unlike the biceps, the brachialis is not involved in supinating the forearm.

Explanation:

7. Coracobrachialis: The coracobrachialis muscle is located in the front of the upper arm, near the shoulder. It arises from the coracoid process of the scapula and inserts into the humerus. This muscle assists in flexing and adducting the arm at the shoulder joint.

Explanation:

8. Teres Major: The teres major is a muscle of the upper arm and shoulder. It is situated on the back side of the upper arm, close to the teres minor. This muscle helps with various movements of the shoulder, including medial rotation, adduction, and extension of the arm.

Explanation:

9. Deltoid: The deltoid muscle is a large, triangular muscle that covers the shoulder joint and forms the rounded contour of the shoulder. It consists of three distinct heads (anterior, lateral, and posterior) and is responsible for various shoulder movements, including abduction (raising the arm away from the body), flexion, and extension.

Explanation:

10. Subscapularis: The subscapularis muscle is located on the anterior (front) surface of the scapula, underneath it. It is another component of the rotator cuff and is responsible for the internal rotation of the shoulder joint, as well as providing stability to the shoulder.

Final Answer

1. Triceps Brachii: Located on the back of the upper arm.

2. Infraspinatus: Situated on the posterior aspect of the scapula (shoulder blade).

3. Teres Minor: Found on the posterior aspect of the scapula, just below the infraspinatus.

4. Biceps Brachii: Located on the front of the upper arm.

5. Supraspinatus: Positioned on the upper part of the scapula, above the spine of the scapula.

6. Brachialis: Deep to the biceps brachii, located on the front of the upper arm.

7. Coracobrachialis: Situated in the front of the upper arm, near the shoulder.

8. Teres Major: Located on the back side of the upper arm, near the teres minor.

9. Deltoid: Forms the rounded contour of the shoulder, covering the shoulder joint.

10. Subscapularis: Situated on the anterior surface of the scapula, beneath it.

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