Study Questions

Brian Lee
Jun 03, 2025
Reviewed

Key Terms

1. Which of the following best describes the sagittal plane?

   1. Divides the body into anterior and posterior portions
   2. Divides the body into superior and inferior portions
   3. Divides the body into left and right portions
   4. Divides the body into medial and lateral portions
   Answer

   c. Divides the body into left and right portions

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   The sagittal plane is a vertical plane that runs front to back, splitting the body into left and right sections. The midsagittal (median) plane creates equal halves, while parasagittal planes create unequal left and right parts.

Rotator Cuff

1. Which rotator‑cuff muscle inserts on the anterior aspect of the 🦴 humerus?

   1. 💪 Supraspinatus
   2. 💪 Infraspinatus
   3. 💪 Teres Minor
   4. 💪 Subscapularis
   Answer

   d. 💪 Subscapularis

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2. Is the 💪 teres minor muscle generally visible on the surface?

   1. Always visible
   2. Usually hidden
   3. Visible only when the arm is abducted and externally rotated
   4. Visible only after significant hypertrophy
   Answer

   c. Visible only when the arm is abducted and externally rotated

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   💪 Teres Minor is one of the four 📓 rotator cuff muscles. It sits deep beneath the 💪 deltoid and 💪 trapezius and is covered by dense fascia along with 💪 infraspinatus. In most individuals and most positions, it is not visible on the surface.

Deltoid

1. Which of the following is the correct insertion point of the deltoid muscle?

   1. Greater tubercle of the humerus
   2. Deltoid tuberosity of the humerus
   3. Acromion process of the scapula
   4. Lateral lip of the bicipital groove
   Answer

   b. Deltoid tuberosity of the humerus

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2. The anterior (clavicular) head of the deltoid originates from which bony landmark?

   1. Spine of the scapula
   2. Acromion process
   3. Lateral third of the clavicle
   4. Medial border of the scapula
   Answer

   c. Lateral third of the clavicle

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3. Which action is primarily performed by the middle (acromial) fibers of the deltoid?

   1. Shoulder flexion
   2. Shoulder abduction
   3. Shoulder extension
   4. Shoulder medial rotation
   Answer

   b. Shoulder abduction

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4. The posterior (spinal) head of the deltoid originates from which bony landmark?

   1. coracoid process
   2. acromion process
   3. spine of scapula
   4. Supraglenoid tubercle
   Answer

   c. spine of scapula

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5. Which bony landmark serves as the origin for the middle (acromial) fibers of the deltoid?

   1. acromion process
   2. spine of scapula
   3. Lateral third of the clavicle
   4. coracoid process
   Answer

   a. acromion process

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6. Which muscle helps initiate abduction of the shoulder before the deltoid takes over?

   1. 💪 Supraspinatus
   2. 💪 Triceps
   3. 💪 Infraspinatus
   4. 💪 Teres Minor
   Answer

   a. 💪 Supraspinatus

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7. The name deltoid is derived from which Greek letter because of the muscle's triangular shape?

   1. Alpha
   2. Beta
   3. Gamma
   4. Delta
   Answer

   d. Delta

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8. Where on the humerus is the deltoid tuberosity located?

   1. Proximal medial shaft
   2. Proximal lateral shaft
   3. Distal medial shaft
   4. Distal posterior shaft
   Answer

   b. Proximal lateral shaft

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9. Which of the following actions is NOT performed by the deltoid?

   1. Shoulder extension
   2. Shoulder abduction
   3. Forearm pronation
   4. Shoulder flexion
   Answer

   c. Forearm pronation

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Triceps

1. Which 💪 triceps head forms the lateral bulge when you extend your arm?

   1. Medial head
   2. Anconeus
   3. Lateral head
   4. Long head
   Answer

   c. Lateral head

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2. All three 💪 triceps heads insert on which bony landmark?

   1. Radial tuberosity
   2. Coronoid process of the ulna
   3. Medial epicondyle of the humerus
   4. Olecranon of the ulna
   Answer

   d. Olecranon of the ulna

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3. The long head of the 💪 triceps originates from which scapular feature?

   1. Supraglenoid tubercle
   2. Infraglenoid tubercle
   3. Coracoid process
   4. Acromion
   Answer

   b. Infraglenoid tubercle

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4. The medial head of the 💪 triceps arises from which part of the humerus?

   1. Posterior shaft below the radial groove
   2. Deltoid tuberosity
   3. Lateral epicondyle
   4. Intertubercular sulcus
   Answer

   a. Posterior shaft below the radial groove

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5. The radial groove, used to trace the lateral head’s form, runs along which bone?

   1. Anterior humerus
   2. Posterior humerus
   3. Posterior ulna
   4. Lateral radius
   Answer

   b. Posterior humerus

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