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Lab practical 3
| Question | Answer |
|---|---|
| What muscle externally rotates in the upper posterior region? | Infraspinatus |
| Which muscle is the powerful extender of the shoulder? | Latissimus dorsi |
| Which muscle does internal rotation + adduction in the upper posterior region? | Teres major |
| Which rotator cuff muscles are on the posterior side? | Infraspinatus and Teres minor |
| What does the posterior deltoid do? | Extension + lateral (external) rotation |
| What is the main function of the triceps? | Extend the elbow |
| What is the function of the supraspinatus? | Initiates abduction of the arm (first 15°) “Supraspinatus STARTS abduction” |
| What is the main function of anterior muscles? | Flexion + internal rotation (shoulder) Flexion (elbow) |
| What is the primary flexor of the elbow? | Brachialis |
| What makes the biceps unique compared to brachialis? | Supination of the forearm |
| If someone cannot supinate, which muscle is affected? | Biceps brachii |
| Which muscle lies deep to the biceps? | Brachialis |
| Which muscle flexes AND adducts the shoulder? | Croacobrachialis |
| What muscles originate from coracoid process? | Both the biceps brachii and the coracobrachialis |
| Which muscles adduct the arm? What nerves are those muscles innervated by? | Infraspinatus, Suprascapular nerve Teres major, subscapular nerve Teres minor, axillary nerve Coracobrachialis, musculocutaneous nerve |
| Which muscles make up the primary support structure for the glenohumeral joint? What is the name of the injury that results from the inflammation of these muscles and leads to reduced shoulder mobility | Supraspinatus, infraspinatus, teres minor, and subscapularis Rotator cuff injury is called adhesive capsulitis which means frozen shoulder. |
| What is the innervation of the deltoid | Axillary nerve |
| What is the innervation of the brachialis | Musculocutaneous nerve |
| what is the innervation of the brachioradialis | Radial nerve |
| what is the innervation of the pronator teres | Median nerve |
| what is the innervation of the supraspinatus | Suprascapular nerve |
| what is the innervation of the flexor carpi ulnaris | Ulnar nerve |
| what is the innervation of the subscapularis | Upper and Lower Subscapular nerves |
| What muscle has the following attachments? Lateral epicondyle of humerus; Proximal ulna; Proximal end of radius | Supinator |
| what are the 4 rotator cuff muscles? | Supraspinatus Infraspinatus --> SITS Teres minor Subscapularis |
| What is the innervation of teres minor? | Axillary nerve |
| What is the primary mover of elbow flexion? | Biceps Brachii |
| ____ is a technique that measures the electrical activity of the muscles and the nerves controlling the muscles. | EMG (Electromyography) |
| _________ is the neuron, together with all of the individual muscle fibers that it innervates | Motor Unit |
| Which muscle inserts on the radial tuberosity? | Biceps brachii |
| What is the primary function of the deltoid muscle? | Abduction of the arm |
| Which structure is the insertion point of the triceps brachii? | Olecranon process |
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