CS 2.1 Ch 9.2

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Breanna

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Quizzes Created: 31 | Total Attempts: 8,241

Questions: 16 | Attempts: 93 | Updated: Mar 21, 2023

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Questions and Answers

1.

Which group of upper arm muscles is referred to as "flexors"?
- A.
  
  The anterior group
- B.
  
  The posterior group
- C.
  
  The proximal group
- D.
  
  The distal group
Correct Answer
A. The anterior group

Explanation
The group of upper arm muscles referred to as "flexors" is the anterior group. These muscles are responsible for flexing the elbow joint, allowing the arm to bend. The anterior group includes muscles such as the biceps brachii and brachialis.

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2.

Which of the following are actions of the biceps brachii?(1) Adduction(2) Flexion(3) Supination
- A.
  
  1 and 2 only
- B.
  
  1 and 3 only
- C.
  
  2 and 3 only
- D.
  
  1, 2, and 3
Correct Answer
C. 2 and 3 only

Explanation
The biceps brachii is a muscle in the upper arm that performs various actions. Flexion refers to the bending of the arm at the elbow joint, which is a primary action of the biceps brachii. Supination refers to the rotation of the forearm so that the palm faces upward, and the biceps brachii also contributes to this movement. Adduction, which is the movement of bringing the arm towards the midline of the body, is not an action performed by the biceps brachii. Therefore, the correct answer is 2 and 3 only.

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3.

The primary artery of the upper arm is the:
- A.
  
  Cervical artery
- B.
  
  Brachial artery
- C.
  
  Axillary artery
- D.
  
  Humeral artery
Correct Answer
B. Brachial artery

Explanation
The brachial artery is the correct answer because it is the primary artery of the upper arm. It is responsible for supplying blood to the muscles of the upper arm and elbow joint. The cervical artery supplies blood to the neck, the axillary artery supplies blood to the armpit and shoulder, and the humeral artery does not exist.

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4.

The insertion point of the triceps brachii muscle is:
- A.
  
  Olecranon process of ulna
- B.
  
  Coronoid process of ulna
- C.
  
  Medial epicondyle of humerus
- D.
  
  Radial tuberosity
Correct Answer
A. Olecranon process of ulna

Explanation
The insertion point of the triceps brachii muscle is the olecranon process of the ulna. This is the bony prominence at the back of the elbow. The triceps brachii muscle is responsible for extending the forearm, and its insertion at the olecranon process allows it to exert force to straighten the arm at the elbow joint.

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5.

All of the following are nerves seen in sectional images of the upper arm, except for:
- A.
  
  Median nerve
- B.
  
  Radial nerve
- C.
  
  Coracobrachialis nerve
- D.
  
  Musculocutaneous nerve
Correct Answer
C. Coracobrachialis nerve

Explanation
The coracobrachialis nerve is not seen in sectional images of the upper arm. The median nerve, radial nerve, and musculocutaneous nerve are all nerves that can be visualized in sectional images of the upper arm.

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6.

Which portion of the distal humerus articulates with the radius?
- A.
  
  Lateral epicondyle
- B.
  
  Medial epicondyle
- C.
  
  Trochlea
- D.
  
  Capitulum
Correct Answer
D. Capitulum

Explanation
The capitulum is the portion of the distal humerus that articulates with the radius. It is a rounded knob-like structure that forms part of the elbow joint. The radius, one of the two bones in the forearm, fits into the capitulum, allowing for movement and rotation of the forearm. The other options, the lateral and medial epicondyles, are bony projections on the distal humerus but do not directly articulate with the radius. The trochlea, on the other hand, articulates with the ulna, not the radius.

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7.

Which of the following muscles is located in the posterior group of the upper arm?
- A.
  
  Anconeus
- B.
  
  Biceps brachii
- C.
  
  Coracobrachialis
- D.
  
  Brachialis
Correct Answer
A. Anconeus

Explanation
The correct answer is Anconeus. The anconeus muscle is located in the posterior group of the upper arm. It is a small triangular muscle that lies on the back of the elbow joint. It assists in extending the forearm and stabilizing the elbow joint during movements. The other options listed, such as Biceps brachii, Coracobrachialis, and Brachialis, are not located in the posterior group of the upper arm.

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8.

The supraspinatus tendon inserts on lesser tubercle of the humerus.
- A.
  
  True
- B.
  
  False
Correct Answer
B. False

Explanation
The supraspinatus tendon actually inserts on the greater tubercle of the humerus, not the lesser tubercle. The greater tubercle is located on the lateral side of the humerus, while the lesser tubercle is on the anterior side. This is an important distinction to make in understanding the anatomy and function of the supraspinatus muscle and tendon.

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9.

Which group of ligaments contributes to the formation of the glenoid labrum?
- A.
  
  Coracoclavicular
- B.
  
  Coracoacromial
- C.
  
  Glenoacromial
- D.
  
  Glenohumeral
Correct Answer
D. Glenohumeral

Explanation
The glenohumeral ligaments contribute to the formation of the glenoid labrum. These ligaments are a group of three ligaments that connect the humerus bone to the glenoid fossa of the scapula. They provide stability to the shoulder joint and help to hold the head of the humerus in place within the glenoid cavity. The glenohumeral ligaments are important for shoulder movement and preventing dislocation of the joint.

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10.

The trochlea of the humerus articulates with the capitellum of the radius.
- A.
  
  True
- B.
  
  False
Correct Answer
B. False

Explanation
The trochlea of the humerus actually articulates with the trochlear notch of the ulna, not the capitellum of the radius. The capitellum of the radius articulates with the head of the radius. Therefore, the statement is false.

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11.

Which rotator cuff muscle inserts on the lesser tubercle of the humerus?
- A.
  
  Supraspinatus
- B.
  
  Infraspinatus
- C.
  
  Subscapularis
- D.
  
  Teres minor
Correct Answer
C. Subscapularis

Explanation
The correct answer is Subscapularis. The subscapularis muscle is one of the four muscles that make up the rotator cuff. It originates from the subscapular fossa of the scapula and inserts on the lesser tubercle of the humerus. Its main function is to internally rotate the arm and stabilize the shoulder joint.

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12.

The pronator teres muscle has two heads of origin.
- A.
  
  True
- B.
  
  False
Correct Answer
A. True

Explanation
The pronator teres muscle is indeed composed of two heads of origin. The first head arises from the medial epicondyle of the humerus, while the second head originates from the coronoid process of the ulna. These two heads of origin come together to form a single muscle belly that inserts onto the radius bone. Therefore, the statement "The pronator teres muscle has two heads of origin" is true.

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13.

Which nerve is compressed in carpal tunnel syndrome?
- A.
  
  Ulnar
- B.
  
  Radial
- C.
  
  Median
- D.
  
  Thenar
Correct Answer
C. Median

Explanation
In carpal tunnel syndrome, the median nerve is compressed. The carpal tunnel is a narrow passageway in the wrist that protects the median nerve and tendons. When the tunnel becomes narrowed or inflamed, it puts pressure on the median nerve, leading to symptoms such as pain, numbness, and tingling in the hand and fingers. The compression of the median nerve is what causes the characteristic symptoms of carpal tunnel syndrome.

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14.

The ulnar nerve is located between the medial epicondyle of the humerus and the olecranon process.
- A.
  
  True
- B.
  
  False
Correct Answer
A. True

Explanation
The ulnar nerve is indeed located between the medial epicondyle of the humerus and the olecranon process. This is a factual statement about the anatomical location of the ulnar nerve in the arm.

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15.

What is the major stabilizing mechanism for the distal radioulnar joint?
- A.
  
  Carpal tunnel
- B.
  
  Triangular fibrocartilage
- C.
  
  Carpal bridge
- D.
  
  Flexor retinaculum
Correct Answer
B. Triangular fibrocartilage

Explanation
The major stabilizing mechanism for the distal radioulnar joint is the triangular fibrocartilage. The triangular fibrocartilage is a structure located on the ulnar side of the wrist that helps to stabilize the joint and provide support during movement. It acts as a cushion between the ulna and the carpal bones, allowing for smooth rotation and movement of the forearm.

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16.

In the middle of the body of the humerus, on the anterior surface, is a roughened area called the deltoid tuberosity.
- A.
  
  True
- B.
  
  False
Correct Answer
A. True

Explanation
The statement is true because the deltoid tuberosity is indeed located in the middle of the body of the humerus on its anterior surface. This roughened area serves as the attachment site for the deltoid muscle, which is responsible for shoulder abduction and flexion.

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Cs 2.1 Ch 9.2

Which group of upper arm muscles is referred to as "flexors"?

Which of the following are actions of the biceps brachii?(1) Adduction(2) Flexion(3) Supination

The primary artery of the upper arm is the:

The insertion point of the triceps brachii muscle is:

All of the following are nerves seen in sectional images of the upper arm, except for:

Which portion of the distal humerus articulates with the radius?

Which of the following muscles is located in the posterior group of the upper arm?

The supraspinatus tendon inserts on lesser tubercle of the humerus.

Which group of ligaments contributes to the formation of the glenoid labrum?

The trochlea of the humerus articulates with the capitellum of the radius.

Which rotator cuff muscle inserts on the lesser tubercle of the humerus?

The pronator teres muscle has two heads of origin.

Which nerve is compressed in carpal tunnel syndrome?

The ulnar nerve is located between the medial epicondyle of the humerus and the olecranon process.

What is the major stabilizing mechanism for the distal radioulnar joint?

In the middle of the body of the humerus, on the anterior surface, is a roughened area called the deltoid tuberosity.