KIN 245 Chapter 6: The Elbow and Radioulnar Joints
Supinator
-origin:lateral epicondyle of the humerus and neighboring posterior part of the ulna -insertion:lateral surface of the proximal radius just below the head -action:supination of the forearm
Muscles that primarily extend the elbow and supinate the forearm uncle all of the following except
Brachialis
Radioulnar supinators include all of the following except
Brachialis
The ____ muscle has the following insertion: lateral surface of the distal end of the radius at the styloid process
brachioradialis
Which of the following muscles is involved in both pronation and supination
brachioradialis
Anconeus muscle
extension of elbow
T/F: Movement at the elbow by the forearm away from the shoulder is accurately described by term "flexion"
false
T/F: insertion of the brachioradiadlis muscle is the proximal end of the radius at the styloid process
false
Action of the elbow and radioulnar joints occur in all of the following planes except
frontal
Pronation
internal rotary movement of radius on ulna that results in hand moving from palm up to palm down position
Origin of the supinator muscle
lateral epicondyle of the humerus and neighboring posterior part of the ulna
The triceps brachii ____head has the following origin: distal 2/3 of the posterior surface of the humerus
medial
Pronator Quadratus muscle
pronation of forearm
the pronator quadrates has the following insertion: distal 1/4 of the anterior side of the ____
radius
T/F: the insertion of the triceps brachii muscle is the olecranon process of the ulna
true
Brachialis muscle
true flexion of elbow
Actions of the brachioradialis muscle include all of the following except
weak flexion of the shoulder
Triceps Brachii muscle
-all heads: extension of elbow -long head: extensions of shoulder joint, adduction of shoulder joint, horizontal abduction
Carrying angle
-anatomical position -forearm to deviate laterally from the arm from 5 to 15 degrees -permits forearms to clear the hips in the swinging movements
Brachioradialis muscle
-flexion of elbow -pronation from supinated position to neutral -supination from pronated position to neutral
Biceps Brachii muscle
-flexion of elbow -supination of forearm -weak flexion of shoulder joint -weak abduction of shoulder joint when externally rotated
The elbow joint is classified as what joint
-ginglymus -hinge joint -allows only flexion and extension
Medial epicondylitis
-golfers elbow -wrist flexor and pronators group near their origin on the medial epicondyle
Bony landmarks
-medial condyloid ridge -olecranon process -coranoid process -radial tuberosity
Key bony landmarks for wrist and hand
-medial epicondyle -lateral epicondyle -lateral supracondylar ridge
Biceps brachia long head
-origin: supraglenoid tubercle above the superior lip of the glenoid fossa insertion:tuberosity of the radius and bicipital aponeurosis action: supination of the forearm, flexion of the elbow, weak flexion of the shoulder joint, weak abduction of the shoulder joint, supination of the forearm
Biceps brachia short head
-origin:coracoid process of the scapula and upper lip of the glenoid fossa in conjunction with the proximal attachment of the coracobrachialis -insertion:tuberosity of the radius and bicipital aponeurosis -action:flexion of the elbow, weak flexion of the shoulder joint, weak abduction of the shoulder joint
Pronator quadratus
-origin:distal 1/4 of the anterior side of the ulna -insertion: distal 1/4 of the anterior side of the radius -action:pronation of the forearm
Brachioradialis
-origin:distal 2/3 of the lateral condyloid ridge of the humerus -insertion: lateral surface of the distal end of the radius at the styloid process -action:flexion of the elbow, pronation from supination to neutral, supination from pronation to neutral
Triceps brachii medial head
-origin:distal 2/3 of the posterior surface of the humerus -insertion:olecranon process of the ulna -action:extension of the elbow joint
Brachialis
-origin:distal half of the anterior shaft of the humerus -insertion:coronoid process of the ulna -action:flexion of the elbow
Pronator teres
-origin:distal part of the medial condyloid ridge of the humerus and medial side of proximal ulna -insertion: middle 1/3 of the lateral surface of the radius -action:pronation of the forearm, weak flexion of the elbow
Triceps brachia long head
-origin:infraglenoid tubercle below inferior lip of glenoid fossa of the scapula -insertion:olecranon process of the ulna -action:extension of the elbow joint, extensions of the shoulder joint, adduction of the shoulder joint, horizontal abduction of the shoulder joint
Anconeus
-origin:posterior surface of the lateral condyle of the humerus -insertion:posterior surface of that lateral olecranon process and proximal 1/4 of the ulna -action:extension of the elbow
Triceps brachii lateral head
-origin:upper half of the posterior surface of the humerus -insertion:olecranon process of the ulna -action:extension of the elbow joint
Posterior jont muscles
-primarily extension and supination: -triceps brachii -anconeus -supinator
Anterior joint muscles
-primarily flexion and pronation: -biceps brachii -brachilais -brachioradialis -pronator teres -pronator quadratus
Lateral epicondylitis
-tennis elbow -involves the extensor digitorum muscle near its origin on the lateral epicondyle
What kinda of joint is the radioulnar joint
-trochoid -pivot-type joint -radial head rotates around in its location at the proximal ulna
T/F: Normal bony limitation of elbow flexion is limited by the cornered process fitting into the coronoid fossa
True
T/F: the origin of the biceps brachia muscle includes the supraglenoid tubercle above the superior lip of the glenoid fossa
True
When viewed from the anatomical position which of the following is located posterior surface of the arm
anconeus
The primary movement of all heads of the triceps brachia at the elbow joints is ____
extension
Supination
external rotary movement of radius on ulna that results in hand moving from palm down to palm up position
T/F: movement at the elbow by the forearm away from the shoulder is accurately described by the term "flexion"
false
Ancients has the following origin: posterior surface of the lateral condyle of the ____
humerus
The ancients has the following origin: posterior surface of the lateral condyle of the _____
humerus
the brachioradialis has the following origin: distal 2/3 of the lateral condyloid ridge of the ____
humerus
Extension
movement of forearm away from shoulder by straightening the elbow to increase its angle
Flexion
movement of forearm to shoulder by bending the elbow to decrease its angle
All heads of the triceps brachia have the following insertion: ____ process of the ulna
olecranon
All heads of the triceps brachii have the following insertion:____ process of the ulna
olecranon
Internal rotary movement of the radius on the ulna that results in the hand moving from palm up to palm down position is termed ____
pronation
which muscle does not act in flexion of the elbow
pronator quadratus
The elbow may be thought of as two interrelated joints: the humeroulnar and the ____ joints
radiohumeral
The elbow may be thought of as two interrelated joints: the humerounlnar and the ____ joints
radiohumeral
Pronator teres has the following insertion: middle 1/3 of the lateral surface of the _____
radius
Flexion of the elbow and supination of the forearm occur about the ____and ____ axes respectively
sagittal and longitudinal
primary movement of the supinator is ____
supination
Supinator muscle
supination of forearm
the biceps brachii long head has the following origin:_____ tubercle above the superior lip of the glenoid fossa
supraglenoid
