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Questions and Answers
What is the action of the Deltoid muscle?
What is the action of the Deltoid muscle?
The Rhomboid Minor has its origin at the spinal processes of T2-5.
The Rhomboid Minor has its origin at the spinal processes of T2-5.
False
What is the insertion point of the Teres Major muscle?
What is the insertion point of the Teres Major muscle?
Medial lip of the intertubercular sulcus
The ___ muscle is responsible for laterally rotating the arm.
The ___ muscle is responsible for laterally rotating the arm.
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Match the following muscles with their primary action:
Match the following muscles with their primary action:
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Which muscle originates from the supraspinatus fossa of the scapula?
Which muscle originates from the supraspinatus fossa of the scapula?
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The insertion of the Subscapularis muscle is the greater tubercle of the humerus.
The insertion of the Subscapularis muscle is the greater tubercle of the humerus.
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What is the action performed by the Teres Minor?
What is the action performed by the Teres Minor?
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The Pectoralis Minor is inserted at the ___ process of the scapula.
The Pectoralis Minor is inserted at the ___ process of the scapula.
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Match the following muscles with their origin:
Match the following muscles with their origin:
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Which muscle is responsible for flexing and adducting the arm?
Which muscle is responsible for flexing and adducting the arm?
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The Biceps Brachii has a long head that originates from the supraglenoid tubercle of the scapula.
The Biceps Brachii has a long head that originates from the supraglenoid tubercle of the scapula.
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What is the primary action of the Triceps Brachii?
What is the primary action of the Triceps Brachii?
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The Brachialis muscle flexes the forearm in all positions, including _____ position.
The Brachialis muscle flexes the forearm in all positions, including _____ position.
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Match the following muscles with their primary actions:
Match the following muscles with their primary actions:
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What is the origin of the short head of the Biceps Brachii?
What is the origin of the short head of the Biceps Brachii?
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The Anconeous muscle assists in flexing the forearm.
The Anconeous muscle assists in flexing the forearm.
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What part of the humerus does the Brachialis muscle primarily attach to?
What part of the humerus does the Brachialis muscle primarily attach to?
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The long head of the Triceps Brachii originates from the _____ tubercle of the scapula.
The long head of the Triceps Brachii originates from the _____ tubercle of the scapula.
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Which muscle is located at the posterior surface of the humerus and assists in extending the forearm?
Which muscle is located at the posterior surface of the humerus and assists in extending the forearm?
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Study Notes
Shoulder Muscles
- Trapezius (upper fibers): Originates from the base of the skull and the nuchal ligament, inserts on the lateral third of the clavicle and acromion. Elevates, extends, and rotates the scapula.
- Trapezius (middle fibers): Originates from the spinous processes of the upper thoracic vertebrae, inserts on the spine of the scapula. Retracts the scapula.
- Trapezius (lower fibers): Originates from the spinous processes of the lower thoracic vertebrae, inserts on the spine of the scapula. Depresses and rotates the scapula.
- Deltoid: Originates from the lateral third of the clavicle and the acromion, inserts on the deltoid tuberosity of the humerus. Abducts, medially/laterally rotates and flexes/extends the arm (depending on the fibers).
- Teres Minor: Originates from the middle part of the lateral border of the scapula, inserts on the inferior facet of the greater tubricle. Laterally rotates the arm.
- Teres Major: Originates from the posterior surface of the inferior angle of the scapula, inserts on the medial lip of the intertubercular sulcus. Adducts and medially rotates the arm.
- Rhomboid Major: Originates from the spinous processes of T2-T5, inserts on the medial border of the scapula. Retracts and elevates the scapula.
- Rhomboid Minor: Originates from C7/T1 spinous processes and nuchal ligament, inserts on the medial border of the scapula. Retracts the scapula.
- Latissimus Dorsi: Originates from the spinous processes of the inferior six thoracic vertebrae, thoracolumbar fascia, inferior 3 or 4 ribs, inserts on the floor of the intertubercular sulcus of the humerus. Extends, adducts and medially rotates the humerus.
- Supraspinatus: Originates from the supraspinatus fossa of the scapula, inserts on the superior facet of the greater tubricle. Abducts the arm.
- Infraspinatus: Originates from the infraspinatus fossa of the scapula, inserts on the middle facet of the greater tubricle of the humerus. Laterally rotates the arm.
- Subscapularis: Originates from the subscapular fossa, inserts on the lesser tubercle. Medially rotates the arm.
- Pectoralis Major: Originates from the medial clavicle and sternum/oblique aponeurosis, inserts on the lip of the intertubercular sulcus of the humerus. Adducts and medially rotates the humerus.
- Pectoralis Minor: Originates from ribs 3-5 and the costal cartilages, inserts on the coracoid process of the scapula. Depresses the scapula.
- Serratus Anterior: Originates from the anterior surfaces of ribs 1-9, inserts on the anterior surface of the medial border of the scapula. Protracts and stabilizes the scapula (also assists in upward rotation).
Arm Muscles
- Coracobrachialis: Originates from the tip of the coracoid process, inserts on the middle third of the medial shaft of the humerus. Flexes and adducts the arm.
- Biceps Brachii: Originates from short head: coracoid process of the scapula and the long head: supraglenoid tubercle of the scapula, inserts on the tuberosity of the radius and the bicipital aponeurosis of the forearm. Flexes and supinates the arm (both heads).
- Brachialis: Originates from the distal half of the anterior surface of the humerus, inserts on the coronoid process and tuberosity of the ulna. Flexes the forearm in all positions, including pronation.
- Triceps Brachii: Originates from long head: infraglenoid tubercle of the scapula, lateral head: posterior surface of the humerus (superior to the radial groove), medial head: posterior surface of the humerus (inferior to the radial groove). Inserts on the olecranon process of the ulna and the fascia of the forearm. Extends the forearm (all heads).
- Anconeus: Originates from the lateral epicondyle of the humerus, inserts on the lateral part of the olecranon process and the posterior surface of the ulna. Extends the forearm.
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Description
Test your knowledge about the muscles of the shoulder, including the trapezius and deltoid. This quiz covers the origins, insertions, and functions of each muscle. Perfect for students of anatomy or anyone interested in human muscle structure.
