1.4.1 Posterior Forearm Flashcards
The two compartments of the forearm are separated by?
The two bones (radius and ulna) and the interossues membrane
Muscles in the posterior compartment of the forearm originate from the?
Lateral epicondyle and epicondyle ridge of the humerus
Muscles in the posterior compartment of the forearm function as?
Extensors and supinators
What nerve innervates the posterior compartment of the forearm?
The radial nerve
What muscle flexes the elbow joint?
Brachioradialis
What muscles extend, abduct, or adduct the wrist joint?
Extensor carpi radialis longus and brevis, extensor carpi ulnaris
What muscles extend the medial four digits? (3)
Extensor digitorum, extensor indicis, and extensor digiti minimi
What muscles extend or abduct the thumb? (3)
Abductor pollicis longus
Extensor pollicis brevis
Extensor pollicis longus
What muscles supinate the forearm?
Supinator
These muscle have proximal attachment to the supracondylar ridge of the humerus?
Brachioradialis and extensor carpi radialis longus
These muscles have common extensor tendon attach to lateral epicondyle.
Extensor carpi radialis brevis, extensor digitorum, Extensor digiti minimi, and extensor carpi ulnaris
Brachioradialis has what function?
Flexes the elbow joint/forearm
What is the origin of the brachioradialis?
Suprarepicondylar ridge
Where does the brachioradialis insert?
Lateral surface of radius
What is the origin of the extensor carpi radialis longus?
Lateral supraepicondylar ridge
Where does the extensor carpi radialis longus insert?
Base of 2nd metacarpal
What is the origin of the extensor carpi radialis brevis?
Lateral epicondylar ridge
Where does the extensor carpi radialis brevis insert?
Into the base of the 3rd metacarpal
What is the function of the extensor carpi radialis?
Extend and abduct/radial deviates the wrist
What is the function of the Abductor Pollicis longus?
Abduct the thumb at the carpomatacarpal joint
Where does the abductor pollicis longus insert?
Base of the 1st metacarpal
Where does the abductor pollicis longus originate?
Post Surface of ulna, radius, inteross membrane
What is the function of the extensor pollicis brevis?
Extend the thumb
Where does the extensor pollicis brevis insert?
it lies parallel to the APL tendon, but it travels further and inserts to the base of the proximal phalanx of the thumb
What are the covered parts and what do they make up?
These make up the anatomical snuff box
Where do the extensor pollicis brevis and longus originate from?
Posterior radius
Interosseus membrane
Where does the extensor pollicis longus insert?
The base of the distal phalanx
What is the function of the extensor pollicis longus?
Extends interphalangeal joint and metacarpophalangeal joint of the thumb
What are the contents of the anatomical snuff box?
Extensor pollicis longus and brevis
Radial artery
Scaphoid
Extensor digitorum functions to?
Extend the medial four digits
Extensor digitorum originates from the?
Lateral epicondyle
Extensor digitorum inserts?
On the extensor expansion
Extensor tendons enter the hand through a _______ which lies deep to the _______.
Common Synovial sheath; extensor retinaculum
Describe the extensor digitorum at the distal metacarpal.
Describe the extensor digitorum at the proximal phalanx.
Compare the flexors and extensor hand insertions.
The extensor digiti minimi enters the hand deep to the ______ in its own _____.
Extensor retinaculum; synovial sheath
The extensor digiti minimi functions?
To extend
The extensor carpi ulnaris inserts?
Inserts on the base of the 5th metacarpal
The extensor indicis origin?
Ulna interos membrane
The extensor indicis enters the hand deep to the extensor retinaculum ___________.
WIthin the common synovial sheath together with the extensor digitorum
The extensor indicis tendon is located on the _______ side of the extensor digitorum tendon
Medial/ulnar side
The supinator muscle originates?
Partially originates from lateral epicondyle and also from radial collateral ligament and anular ligament
Where does the supinator insert?
It inserts into lateral, anterior/posterior surface of radius
What is the function of the supinator?
Supinates the forearm by rotating radius
What are the characteristics of elbow tendonitis (Lateral epicondylitis)?
What is a synovial cyst of the wrist?
What are the characteristics of the superficial branch of the radial nerve?
What are the characteristics of the deep branch of the radial nerve?
