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Stack #4738479
| Question | Answer |
|---|---|
| What is the primary action of the Pectoralis Major? | Adduction, horizontal adduction, and medial rotation of the arm at the shoulder joint. |
| Which nerve innervates the Pectoralis Major? | Nerves C7-T1 |
| What is the origin of the Pectoralis Major? | Sternum, clavicle and costal cartilages 2-4 |
| What is the primary action of the Pectoralis Minor? | Depression, downward rotation, and abduction of the scapula; elevation of the ribs |
| Which nerve innervates the Pectoralis Minor? | Medial pectoral nerve (C8-T1) |
| What is the origin of the Pectoralis Minor? | Ribs 3-5 |
| What is the primary action of the Serratus Anterior? | Depression, abduction, and upward rotation of the scapula; elevation of the ribs when the scapula is fixed |
| Which nerve innervates the Serratus Anterior? | Long Thoracic Nerve (C5-C7) |
| What is the origin of the Serratus Anterior? | Ribs 1-9 |
| What is the primary action of the Subscapularis? | Internal rotation of the head of the humerus; prevents anterior displacement of the humerus |
| Which nerve innervates the Subscapularis? | Upper and Lower subscapular nerves (C5-C6) |
| What is the origin of the Subscapularis? | Subscapular fossa |
| What is the primary action of the Deltoid? | Anterior: flexion, medial rotation; Middle: Abduction; Lateral: Extension, external rotation |
| Which nerve innervates the Deltoid? | Axillary Nerve (C5, C6) |
| What is the origin of the Deltoid? | Lateral 3rd of clavicle; acromion process; spine of scapula |
| What is the primary action of the Biceps Brachii: Short Head (medial)? | Forearm at elbow: flexion and supination. Shoulder joint: flexion |
| Which nerve innervates the Biceps Brachii: Short Head (medial)? | Musculocutaneous nerve (C5, C6) |
| What is the origin of the Biceps Brachii: Short Head (medial)? | Coracoid process of the scapula |
| What is the primary action of the Biceps Brachii: Long Head (lateral)? | Forearm at elbow: flexion and supination. Shoulder joint: flexion |
| Which nerve innervates the Biceps Brachii: Long Head (lateral)? | Musculocutaneous nerve (C5, C6) |
| What is the origin of the Biceps Brachii: Long Head (lateral)? | Supraglenoid tubercle of the scapula |
| What is the primary action of the Brachialis? | Forearm at elbow: flexion |
| Which nerve innervates the Brachialis? | Musculocutaneous nerve (C5, C6), and a branch of the radial nerve |
| What is the origin of the Brachialis? | Anterior distal half of the humerus |
| What is the primary action of the Coracobrachialis? | Flexion, adduction, and horizontal adduction of the arm at the shoulder joint; assists in retaining the head of the humerus in contact with the glenoid cavity |
| Which nerve innervates the Coracobrachialis? | Musculocutaneous nerve (C5-C7, mainly C7) |
| What is the origin of the Coracobrachialis? | Coracoid process of the scapula |
| What is the primary action of the Triceps Brachii: Long Head? | Forearm at elbow: extension; Shoulder joint: extension, adduction |
| Which nerve innervates the Triceps Brachii: Long Head? | Radial nerve (C6-C8) |
| What is the origin of the Triceps Brachii: Long Head? | Infraglenoid tuberosity |
| What is the primary action of the Triceps Brachii: Lateral Head? | Forearm at elbow: extension |
| Which nerve innervates the Triceps Brachii: Lateral Head? | Radial nerve (C6-C8) |
| What is the origin of the Triceps Brachii: Lateral Head? | Posterior surface of the body of humerus |
| What is the primary action of the Triceps Brachii: Medial Head? | Forearm at elbow: extension |
| Which nerve innervates the Triceps Brachii: Medial Head? | Radial nerve (C6-C8) |
| What is the origin of the Triceps Brachii: Medial Head? | Posterior surface of the body of humerus, below the groove for the radial nerve |
| What is the primary action of the Triceps Tendon? | Forearm at elbow: extension |
| Which nerve innervates the Triceps Tendon? | Radial nerve (C6-C8) |
| What is the origin of the Triceps Tendon? | Posterior surface of the body of humerus |
| What is the primary action of the Anconeus? | Forearm at elbow: extension |
| Which nerve innervates the Anconeus? | Radial nerve (C7, C8) |
| What is the origin of the Anconeus? | Posterior part of lateral epicondyle of the humerus |
| What is the primary action of the Brachioradialis? | Forearm at elbow: flexion |
| Which nerve innervates the Brachioradialis? | Radial nerve (C5, C6) |
| What is the origin of the Brachioradialis? | Ridge superior to the lateral epicondyle of the humerus, lateral intermuscular septum |
| What is the primary action of the Extensor Carpi Radialis Longus? | Wrist: extension, abduction |
| Which nerve innervates the Extensor Carpi Radialis Longus? | Radial nerve (C6, C7) |
| What is the origin of the Extensor Carpi Radialis Longus? | Lower 3rd of the lateral supracondylar ridge of the humerus |
| What is the primary action of the Extensor Carpi Radialis Brevis? | Wrist: extension, abduction |
| Which nerve innervates the Extensor Carpi Radialis Brevis? | Radial nerve (C6, C7) |
| What is the origin of the Extensor Carpi Radialis Brevis? | Lateral epicondyle of the humerus, by the common tendon |
| What is the primary action of the Extensor Digitorum? | Extension of joint of the digits 2-5; extension of the hand at the wrist joint |
| Which nerve innervates the Extensor Digitorum? | Deep radial nerve (C6-C8) |
| What is the origin of the Extensor Digitorum? | Lateral epicondyle of the humerus, by the common tendon |
| What is the primary action of the Extensor Digiti Minimi? | Extension of the joints of the digit 5 (little finger); extension of the hand at the wrist joint |
| Which nerve innervates the Extensor Digiti Minimi? | Deep radial nerve (C6-C8) |
| What is the origin of the Extensor Digiti Minimi? | Lateral epicondyle of the humerus, by the common tendon |
| What is the primary action of the Extensor Carpi Ulnaris? | Wrist: extension, adduction |
| Which nerve innervates the Extensor Carpi Ulnaris? | Deep branches of the radial nerve (C6-C8) |
| What is the origin of the Extensor Carpi Ulnaris? | Lateral epicondyle of the humerus, by common tendon; dorsal surface of the ulna |
| What is the primary action of the Supinator? | Supinates the hand and forearm by rotating the radius around the ulna |
| Which nerve innervates the Supinator? | Deep radial nerve (C6) |
| What is the origin of the Supinator? | Lateral epicondyle of the humerus, ulna, radial collateral ligaments, and annular ligaments |
| What is the primary action of the Abductor Pollicis Longus? | Extension of the 1st digit (thumb, pollex); abduction of the hand at the wrist joint |
| Which nerve innervates the Abductor Pollicis Longus? | Deep radial nerve (C6, C7) |
| What is the origin of the Abductor Pollicis Longus? | Lateral dorsal surfaces of the radius and ulna and the interosseous membrane |
| What is the primary action of the Extensor Pollicis Longus? | Extension of the 1st digit (thumb, pollex) |
| Which nerve innervates the Extensor Pollicis Longus? | Deep radial nerve (C6, C7) |
| What is the origin of the Extensor Pollicis Longus? | Middle part of the posterior ulnar body and the interosseous membrane |
| What is the primary action of the Extensor Pollicis Brevis? | Extension of the 1st digit (thumb, pollex); abduction of the hand at the wrist joint |
| Which nerve innervates the Extensor Pollicis Brevis? | Deep radial nerve (C6, C7) |
| What is the origin of the Extensor Pollicis Brevis? | Dorsal surface of the body of the radius and the interosseous membrane distal to origin of APL |
| What is the primary action of the Extensor Indicis? | Extension of the 2nd digit (index finger); extension of the hand at the wrist joint |
| Which nerve innervates the Extensor Indicis? | Deep radial nerve (C6, C7) |
| What is the origin of the Extensor Indicis? | Posterior surface of the ulna and the interosseous membrane |
| What is the primary action of the Flexor Carpi Ulnaris? | Wrist: flexion; Hand: adduction (ulnar deviation) |
| Which nerve innervates the Flexor Carpi Ulnaris? | Ulnar nerve (C7, C8) |
| What is the origin of the Flexor Carpi Ulnaris? | Medial epicondyle of humerus, olecranon of the ulna |
| What is the primary action of the Flexor Carpi Radialis? | Flexion and abduction (radial) of the hand at the wrist joint; pronation of the forearm |
| Which nerve innervates the Flexor Carpi Radialis? | Median nerve (C6, C7) |
| What is the origin of the Flexor Carpi Radialis? | Medial epicondyle of the humerus |
| What is the primary action of the Flexor Digitorum Superficialis? | Flexion of middle and proximal phalanges of digits 2-5; flexion of the hand at the wrist joint |
| Which nerve innervates the Flexor Digitorum Superficialis? | Median nerve (C7-T1) |
| What is the origin of the Flexor Digitorum Superficialis? | Humeral head: medial epicondyle; Ulnar head: coronoid process; Radial head: below the radial tuberosity |
| What is the primary action of the Flexor Digitorum Profundus? | Flexion of the distal phalanges of digits 2-5; flexion of the hand at the wrist joint |
| Which nerve innervates the Flexor Digitorum Profundus? | Interosseous branch of the median and ulnar nerves (C8, T1) |
| What is the origin of the Flexor Digitorum Profundus? | Proximal 3/4ths of the anterior and medial surfaces of the ulna and interosseous membrane |
| What is the primary action of the Palmaris Longus? | Flexion of the hand at the wrist joint |
| Which nerve innervates the Palmaris Longus? | Median nerve (C7, C8) |
| What is the origin of the Palmaris Longus? | Medial epicondyle of the humerus |
| What is the primary action of the Pronator Teres? | Forearm at elbow: pronation, flexion |
| Which nerve innervates the Pronator Teres? | Median nerve (C6, C7) |
| What is the origin of the Pronator Teres? | Medial epicondyle of the humerus; coronoid process of the ulna |
| What is the primary action of the Pronator Quadratus? | Pronates the hand |
| Which nerve innervates the Pronator Quadratus? | Interosseous branch of the median nerve (C8, T1) |
| What is the origin of the Pronator Quadratus? | Distal 4th of the anterior surface of the ulna |
| What is the primary action of the Flexor Pollicis Longus? | Flexion of the distal phalanx of the 1st digit (thumb, pollex) |
| Which nerve innervates the Flexor Pollicis Longus? | Interosseous branch of the median nerve (C8, T1) |
| What is the origin of the Flexor Pollicis Longus? | Anterior surface of the radius and the interosseous membrane |
| What is the primary action of the Dorsal Interossei (1st - 4th)? | Abduction of MCP joints of digits 2 and 4; flexion of MCP joints of digits 2-5; extension of IP joints of digits 2-5 |
| Which nerve innervates the Dorsal Interossei (1st - 4th)? | Ulnar nerve, deep branch (C8-T1) |
| What is the origin of the Dorsal Interossei (1st - 4th)? | Two heads from adjacent sides of metacarpal bones |
| What is the primary action of the Palmar Interossei (1st - 3rd)? | Flexion of MCP joints of digits 2-5; extension of IP joints of digits 2-5; adduction of MCP joints of digits 2 and 4 |
| Which nerve innervates the Palmar Interossei (1st - 3rd)? | Ulnar nerve, deep branch (C8-T1) |
| What is the origin of the Palmar Interossei (1st - 3rd)? | One head from metacarpals of digits 2, 4, and 5 |
| What is the primary action of the Opponens Digiti Minimi? | Opposition of digit 5 (across palm) |
| Which nerve innervates the Opponens Digiti Minimi? | Ulnar nerve (C8-T1) |
| What is the origin of the Opponens Digiti Minimi? | Flexion retinaculum, hook of hamate |
| What is the primary action of the Abductor Digiti Minimi? | Abducts digit 5 |
| Which nerve innervates the Abductor Digiti Minimi? | Ulnar nerve, deep branch (C8-T1) |
| What is the origin of the Abductor Digiti Minimi? | Pisiform bone |
| What is the primary action of the Flexor Digiti Minimi Brevis? | Flexion of joints of digit 5 |
| Which nerve innervates the Flexor Digiti Minimi Brevis? | Deep branch of ulnar nerve (C8, T1) |
| What is the origin of the Flexor Digiti Minimi Brevis? | Flexor retinaculum, hook of hamate |
| What is the primary action of the Palmaris Brevis? | Folds skin on ulnar side of palm |
| Which nerve innervates the Palmaris Brevis? | Superficial branch of ulnar nerve (C8, T1) |
| What is the origin of the Palmaris Brevis? | Flexor retinaculum; medial border of palmar aponeurosis |
| What is the primary action of the Abductor Pollicis Brevis? | Abduction of digit 1 |
| Which nerve innervates the Abductor Pollicis Brevis? | Median nerve, recurrent branch (C8, T1) |
| What is the origin of the Abductor Pollicis Brevis? | Flexor retinaculum, scaphoid, trapezium |
| What is the primary action of the Opponens Pollicis? | Opposition of thumb |
| Which nerve innervates the Opponens Pollicis? | Median nerve (C8-T1) |
| What is the origin of the Opponens Pollicis? | Flexor retinaculum, scaphoid, trapezium |
| What is the primary action of the Flexor Pollicis Brevis? | Flexes proximal phalanx of digit 1; flexes metacarpal bone and rotates medially |
| Which nerve innervates the Flexor Pollicis Brevis? | Superficial: Median nerve (C8-T1); Deep: deep branch of ulnar nerve (C8-T1) |
| What is the origin of the Flexor Pollicis Brevis? | Superficial head: flexor retinaculum and trapezium; Deep head: trapezoid and capitate |
| What is the primary action of the Adductor Pollicis? | Adduction of digit 1 |
| Which nerve innervates the Adductor Pollicis? | Ulnar nerve, deep branch (C8-T1) |
| What is the origin of the Adductor Pollicis? | Metacarpals 2 and 3 and capitate |
| What is the primary action of the Lumbricals (1st - 4th)? | Flexes MCP joints; extends PIP and DIP joints |
| Which nerve innervates the Lumbricals (1st - 4th)? | Lumbricals 1 & 2: Median nerve (C8-T1); Lumbricals 3 & 4: Ulnar nerve, deep branch (C8-T1) |
| What is the origin of the Lumbricals (1st - 4th)? | Tendons of flexor digitorum profundus |
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