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Elbow Wrist Hand O&I

Origins, Insertions, Actions Elbow/Wrist/Hand segment

QuestionAnswer
Bi-articular muscle A muscle that crosses and has actions on two articulations
Uni-articular muscle A muscle that has actions on only one articulation
Poly-articular A muscle that crosses and has actions on three or more articulations
Number of bones that make up the wrist 8
Area of the wrist made up of eight small bone Carpals
Three types of phalanges Proximal, Middle, Distal
Number of bones that make up the hand 19
Number of phalanges in the hand 14
The three bones making up the functional wrist-hand mechanism - Humerus - Ulna - Radius
Bony landmarks of the humerus (5) - Lateral supracondylar ridge - Lateral epicondyle - Medial epicondial - Trochlea - Intertubercular sulcrus
Bony landmarks of the radius (4) - Radial head and neck - Radial tuberosity - Styloid process of the radius - Oblique line
Bony landmarks of the ulna (3) - Oleacranon - Styloid process of the ulna - Coronoid Process
Medial articulation of the upper limb Elbow
Distal articulation of the upper limb Wrist
The "zero" position At 90* flexion, palms facing the body
Functional group of bones forming the elbow Humerus, Ulna, Radius
Attachment points for muscles of the elbow On the scapula or the humerus
Insertion points for muscles of the elbow On the radius or the ulna
Three muscles affecting the elbow Biceps Brachii, Triceps Brachii, Brachioradialis
Biceps Brachii origins (2), insertion Origins: 1-short head: coracoid process of the scapula 2- long head: supraglenoid tubercle of the scapula Insertion: radial tuberosity of the radius
Brachioradialis origin, insertion Origin: superior 2/3 of the lateral supracondylar ridge Insertion: Styloid process of the radius
The only muscle of the forearm that does NOT have an impact at the wrist Brachioradialis
Triceps Brachii origins (3), insertion Origins: 1-long head: infraglenoid tubercle of the scapula 2- medial head: inferior 1/2 of the posterior surface of the diaphsys 3- lateral head: superior 1/2 of the lateral surface of the diaphsys insertion: olecranon (ulna)
Superficial muscles that have an action on the wrist and hand segment (8) - Flexor carpi radialis - Palmaris longus - Flexor carpi ulnaris - Flexor digitorum superficialis - Extensor carpi radialis longus - Extensor carpi radialis brevis - Extensor digitorum - Extensor carpi ulnaris
The common origin of the four flexor muscles of the wrist and hand segment Medial epicondyle (humerus)
The common origin of three of the four extensor muscles of the wrist and hand segment Lateral epicondyle (humerus)
Flexor Carpi Radialis Origin, Insertion Origin: medial epicondyle of the humerus Insertion: 2nd and 3rd metacarpal base, palmar surface
Palmaris Longus Origin, Insertions (2) Origin: medial epicondyle of the humerus Insertion: 1- palmar carpal ligament (flexor retinaculum) 2- palmar aponeurosis
Flexor Carpi Ulnaris Origin, Insertion Origin: medial epicondyle of the humerus Insertion: Carpal - pisiform
Flexor Digitorum Superficialis Origins (3) Insertion Origins:1- medial epicondyle of the humerus 2- lateral portion of the coronoid process (ulna) 3- oblique line of the radius Insertions:proximal, lateral and medial borders of the 2nd to 5th phalanges
Extensor Carpi Radialis Longus Origin, Insertion Origin: inferior 1/3 of the lateral supracondyle ridge of the humerus Insertion: 2nd metacarpal base, dorsal surface
Extensor Carpi Radialis Brevis Origin, Insertion Origin: lateral epicondyle Insertion: 3rd metacarpal base, dorsal surface
Extensor Carpi Ulnaris Origins (2), Insertion Origins: 1- lateral epicondyle of the humerus 2- middle 1/3 posterior surface of ulna Insertion: 5th metacarpal base, dorsal surface
Extensor Digitorum Origin, Insertion Origin: lateral epicondyle of the humerus Insertion: 2nd to 5th digit base, dorsal surface
Elbow flexion, actors biceps brachii, brachioradialis
Elbow Supination, actor biceps brachii
Elbow extension, actor triceps brachii
Wrist flexion, actors Flexor Carpi Radialis, Palmaris Longus, Flexor Carpi Ulnaris, Flexor Digitorum Superficialis
Wrist extension, actors Extensor Carpi Radialis Longus, Extensor Carpi Radialis Brevis, Extensor Carpi Ulnaris, Extensor Digitorum
Wrist adduction, actors Flexor Carpi Ulnaris, Extensor Carpi Ulnaris
Digit flexion, actor Flexor Digitorum Superficialis
Digit extension, actor Extensor Digitorum
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