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Muscles of Hand

Flexors/Extensors

QuestionAnswer
Originate above, or proximal to, the wrist joint and assist in wrist function but primary function is fingers and thumb function Extrinsic
Smaller muscles that originate within the hand (at or distal to the carpal bones). Can be subdivided into the thenar, hypothenar, and deep palm muscles Intrinsic
Numbness, tingling, pain and weakness Carpal Tunnel Syndrome
Outstretched hand/Radial fracture Colles’ Fracture
Fall on the back of the hand fracture Smith’s Fracture
Compression of the median nerve Carpal Tunnel Syndrome
Inflammation of the sheath of the extensor pollicis brevis and abductor pollicis longus Tenosynovitis
True of False? Ulna does not rotate True
True of False? Radius moves around the ulna True
Carrying Angle The humerus and forearm are not aligned in a perfectly straight line, they actually form a slight lateral angle at the joint
Why does the carrying angle perform a slight lateral angle at the joint? This is because the trochlea is lower than the capitulum at the distal end of the humerus.
Three bony landmarks of the Scapula? 1. Infraglenoid tubercle 2. Supraglenoid tubercle 3. Coracoid process
Five bony landmarks of the humerus? 1. Trochlea (articulates with the ulna) 2. Capitulum (articulates with the radius) 3. Medial and lateral epicondyle 4. Lateral supracondylar ridge 5.Olecranon fossa (posterior – articulates with the ulna)
Three bony landmarks of the Radius? 1. Head 2. Radial tuberosity 3. Styloid process
1. Between radius and ulna 2. Keeps the two bones from separating 3. Provides more surface area for muscles attachment Interosseous Membrane
Brachialis Muscle O – Distal half of the humerus, anterior surface I – Coronoid process and ulnar tuberosity of the ulna A – Elbow flexion
Biceps Brachii O – 1. Long head – supraglenoid tubercle of the scapula 2. Short head – coracoid process of the scapula I – Radial tuberosity of the radius A - Elbow flexion and forearm supination
Brachioradialis Muscle O– Lateral supracondylar ridge on the humerus I - Styloid process of the radius A- Elbow flexion
Triceps Muscles O – 1. Long head – Infraglenoid tubercle of the scapula 2. Lateral head – inferior to greater tubercle on the posterior humerus 3. Medial head – Posterior humerus I – Olecranon process of the ulna A – Elbow extension
Pronator Teres O – Medial epicondyle of the humerus and coronoid process of the ulna I – Lateral aspect of the radius A – Pronation of forearm and assists with elbow flexion
Pronator Quadratus Muscle O – Distal one-fourth of ulna I – Distal one-fourth of radius A – Pronation of the forearm
Supinator Muscle O – Lateral epicondyle of humerus and adjacent ulna I – Anterior surface of the proximal radius A – Supination of forearm
Lateral epicondylitis/ Tennis Elbow Affects the common extensor tendon that inserts lateral epicondyle of the humerus
Medial epicondylitis/Golfers Elbow Affects the common flexor tendon that inserts medial epicondyle of the humerus
Flexion Muscles? Biceps Brachii, Brachialis, Brachioradialis
Extension Muscles? Triceps
Pronation Muscles? Pronator Teres and Quadratus
Supination Muscles? Biceps Brachii and Supinator
Movement of Wrist? 1.Wrist flexion 2. Wrist extension 3. Ulnar deviation 4. Radial deviation
Anterior Muscles of the forearm 3 muscles: 1. Flexor carpi radialis 2. Flexor carpi ulnaris 3. Palmaris longus
Flexor Carpi Radialis O: Medial epicondyle of humerus I: 2nd and 3rd metacarpal bones A: wrist flexion and radial deviation
Palmaris Longus O: Medial epicondyle of humerus I: Palmar fascia A: Wrist flexion
Flexor Carpi Ulnaris O: Medial epicondyle of humerus I: Pisiform, and base of 5th Metacarpal A: Wrist flexion and ulnar deviation
Posterior Muscles of Forearm 3 muscles: 1. Extensor carpi radialis longus 2. Extensor carpi radialis brevis 3. Extensor carpi ulnaris
Extensor Carpi Radialis Longus O: Supracondylar ridge of humerus I: Base of 2nd metacarpal bone A: Wrist extension and radial deviation
Extensor Carpi Radialis Brevis O: Lateral epicondyle of humerus I: Base of 3rd metacarpal A: Wrist extension
Extensor Carpi Ulnaris O: Lateral epicondyle of humerus I: Base of 5th metacarpal A: wrist extension and ulnar deviation
CANCEL OUT : FLEXION FLEXOR CARPI ULNARIS FLEXOR CARPI RADIALIS
CANCEL OUT : EXTENSION EXTENSOR CARPI ULNARIS EXTENSOR CARPI RADIALIS LONGUS
CANCEL OUT : ULNAR DEVIATION FLEXOR CARPI ULNARIS EXTENSOR CARPI ULNARIS
CANCEL OUT : RADIAL DEVIATION FLEXOR CARPI RADIALIS EXTENSOR CARPI RADIALIS LONGUS
Created by: Genevadarcius
 

 



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