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Some examples from this set of practice questions
1.
Deltoid:
Answer: Origin: 1. Lateral 1/3 of clavicle (anterior fibers) 2. Acromion (lateral fibers) 3. Spine of scapula (posterior fibers) Insertion: Deltoid tuberosity of humerus Functions: (7) 1. Flexion of arm @ gleno-humeral joint (anterior fibers) 2. Extension of arm @ shoulder joint (posterior fibers) 3. Abduction of arm @ shoulder joint (entire muscle) 4. Medial rotation of arm @ shoulder joint (anterior fibers) 5. Lateral rotation of arm @ shoulder joint (posterior fibers) 6. Horizontal Adduction of arm @ shoulder joint (anterior fibers) 7. Horizontal Abduction of arm @ shoulder joint (posterior fibers) Nerve: Axillary nerve (C5, 6)
2.
Subscapularis:
Answer: Origin: Subscapular fossa Insertion: Lesser tubercle of humerus Function: (1) 1. Medial rotation of arm @ shoulder joint Nerve: Upper and lower subscapular nerves
3.
Supraspinatus:
Answer: Origin: Supraspinous fossa Insertion: Superior facet of greater tubercle of humerus Function: (1) 1. Abduction of arm @ shoulder joint Nerve: Suprascapular nerve
4.
Infraspinatus:
Answer: Origin: Infraspinous fossa Insertion: Middle facet of greater tubercle of humerus Function: (2) 1. Lateral rotation of arm @ shoulder joint 2. Horizontal abduction of arm @ shoulder joint Nerve: Suprascapular nerve
5.
Teres Minor:
Answer: Origin: The superior lateral border of scapula Insertion: Inferior facet of greater tubercle of humerus Function: (3) 1. Lateral rotation of arm @ shoulder joint 2. Extension of arm @ shoulder joint 3. Horizontal abduction of arm @ shoulder joint Nerve: Axillary nerve (C5, 6)
6.
Teres Major:
Answer: Origin: The inferior lateral border of the scapula Insertion: Medial lip of intertubercular sulcus Function: (3) 1. Medial rotation of arm @ shoulder joint 2. Extension of arm @ shoulder joint 3. Adduction of arm @ shoulder joint Nerve: Lower subscapular
7.
Biceps brachii:
Answer: Origin: Short head: Coracoid process of scapula Long head: Supraglenoid tubercle of scapula Insertion: Radial tuberosity and the bicipital aponeurosis Function: (4) 1. Flexion of forearm @ elbow joint 2. Supination of forearm @ radioulnar joint 3. Flexion of arm @ shoulder joint 4. Horizontal adduction of arm @ shoulder joint (short head) Nerve: Musculocutaneous
8.
Coracobrachialis:
Answer: Origin: Coracoid process of scapula Insertion: Middle of the medial shaft of humerus Function: (3) 1. Flexion of arm @ shoulder joint 2. Adduction of arm @ shoulder joint (~) 3. Horizontal adduction of arm @ shoulder joint Nerve: Musculocutaneous
9.
Brachialis:
Answer: Origin: Distal anterior surface of humerus Insertion: Ulnar tuberosity and coronoid process of ulna Function: (1) 1. Flexion of forearm @ elbow joint Nerve: Musculocutaneous
10.
Triceps brachii:
Answer: Origin: Long head: Infraglenoid tubercle Lateral head: Proximal ½ of posterior shaft at humerus Medial head: Distal ½ of posterior shaft at humerus Insertion: Olecranon process of ulna Function: (3) 1. Extension of forearm @ elbow joint 2. Extension of arm @ shoulder joint (Long head) 3. Horizontal Abduction of arm @ shoulder joint (Long head) Nerve: Radial nerve
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