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