Anterior aspect of the forearm and the cubital fossa Flashcards
What are the superficial veins of the forearm?
Cephalic vein, Basilic vein, Median cubital vein and Median vein of forearm.
Vein in red
Cephalic vein
Part above middle branch
Brachial cephalic vein
Part below middle branch
Antebrachial cephalic vein
Where does the cephalic vein begin and end?
Begins at the dorsum of the hand (drains venous blood) and
Continues on the radial side.
Passes the deltopectoral groove
Drains into the axillary vein (armpit)
What is the clinical importance of the superficial veins of the forearm?
Intravenous injections
Deltopectoral groove (between deltoid muscle and pectoralis major)
Vein in red
Basilic vein
Part above middle branch
Brachial basilic vein
Part below middle branch
Antebrachial basilic vein
Where does the basilic vein begin and end?
Begin: dorsum of the hand
Runs on the ulnar side
The brachial vein continues at the axillary vein contrasting the cephalic vein that drains into the axillary vein
Green highlighter
Median cubital vein
Green highlighter
Median vein of forearm
What does the median cubital vein branch from?
Branches from the cephalic vein and joins the basilic vein
What is the function of the median vein of the forearm?
Drains the venous blood of the palm surface of the hand and usually drains into the median cubital vein.
What is the exception for drainage of the median vein of the forearm?
Sometimes it divides into 2 branches and drains into the cephalic or basilic veins.
What do the cephalic and basilic veins drain?
Drain venous blood from the dorsal surface of the hand.
What is the fascia of the forearm?
Antebrachial fascia
What is the fascia of the arm?
Brachial fascia
What is a fascia?
Connective tissue
What are the functions of the fascia of upper arm?
Provides sheath for muscles (can seperate 1 group of muscle to another)
Provides septa (division) between muscles
Provides attachments for muscles
Attachment of olecranon to the posterior border of the ulna.
Thickening of fascia
Flexor Retinaculum (anteriorly forms band)(all muscles within flex)
Thickening of fascia
Extensor Retinaculum (posteriorly forms band) (all muscles within extend)
Whats the function of the flexor and extensor retinaculum?
Holds the muscle tendons and increases the effect of the muscle
What are the 3 compartments of the muscles of the anterior forearm?
Superficial, middle and deep compartment?
Which muscles are in the superficial compartment of the anterior forearm?
Pronator teres muscle
Flexor carpi radialis muscle
Palmaris longus muscle
Flexor carpi ulnaris muscle
Which muscles are in the middle compartment of the anterior forearm?
Flexor digitorum (finger) superficialis (superficial)
Which muscles are in the deep compartment of the anterior forearm?
Flexor digitorum profundus
Flexor policis(thumb) longus
Pronotor (pronator) quadratus
Superficial compartment
Pronator teres muscle
What’s the origin of the pronator teres muscle?
Humeral head → upper part of medial epicondyle, CFT, antebrachial fascia
Ulnar head →medial border of coronoid proc.
What’s the insertion of the pronator teres muscle?
Anterior surface of radius (passes the elbow joint)
What’s the function of the pronator teres muscle?
Pronation (palm faces downward)(medial rotation) , weak flexion of forearm
What’s the nerve passing through the pronator teres muscle?
Median nerve
Flexor carpi(wrist) radialis muscle
What’s the origin of the Flexor carpi radialis muscle?
medial epicondyle, CFT (common flexor tendon), antebrachial fascia
What’s the insertion of the Flexor carpi radialis muscle?
Base of 2nd metacarpal
What’s the function of the Flexor carpi radialis muscle?
Flexion and abduction of the wrist. Weak flexor of the elbow
What’s the nerve passing through the Flexor carpi radialis muscle?
Median nerve
Palmaris longus muscle (can be absent in some people)
What’s the origin of the Palmaris longus muscle?
medial epicondyle, antebrachial fascia
What’s the insertion of the Palmaris longus muscle?
Flexor retinaculum, palmar aponeurosis( dense connective tissue beneath skin)
What’s the function of the Palmaris longus muscle?
Flexion of the wrist and stretches the palmar aponeurosis
What nerve passes through the Palmaris longus muscle?
Median nerve
What muscles does the median nerve pass through?
Pronator teres muscle, Flexor carpi radialis muscle, Palmaris longus muscle, Flexor digitorum superficialis, Lateral Flexor digitorum profundus, Flexor policis longus, and pronator quadratus muscle.
Name the 2 muscles
Left: Flexor carpi radialis muscle
Right: Flexor carpi ulnaris muscle
What’s the origin of the Flexor carpi ulnaris muscle?
humeral head → medial epicondyle
Ulnar head → medial border of ulna, olecranon
What’s the insertion of the Flexor carpi ulnaris muscle?
Pisiform, 5th metacarpal bone
What’s the function of the Flexor carpi ulnaris muscle?
Flexion and adduction of the wrist(Lateral rotation)
What nerve passes through the Flexor carpi ulnaris muscle?
Ulnar nerve
Name the 2 muscles
Left: Flexor policis longus
Right: Flexor digitorum superficilalis
What’s the origin of the Flexor digitorum superficilalis?
humeroulnar head → medial epicondyle, CFT (common flexor tendon), anterior surface of ulnar colateral ligament
Radial head → anterior surface of radius
What is the common flexor tendon?
Extends from the medial epicondyle of the humerus
What’s the insertion of the Flexor digitorum superficilalis?
sides of the medial 4 middle phalanx
What’s the function of the Flexor digitorum superficilalis?
Flexion of the proximal phalanx
What’s the nerve passing through the Flexor digitorum superficilalis?
Median nerve
Name the 2 muscles.
Left: Flexor policis longus
Right: Flexor digitorum profundus
What’s the origin of the Flexor digitorum profundus?
anterior and medial surface of ulna, interosseus membrane
What’s the insertion of the Flexor digitorum profundus?
base of the medial 4 distal phalanx
What’s the function of the Flexor digitorum profundus?
Flexion of the distal phalanx, flexion of wrist and metacarpophalangeal joint
What’s the nerve passing the Flexor digitorum profundus?
Lateral →Median nerve
Medial → Ulnar nerve
What’s the origin of Flexor policis longus?
interosseus membrane, anterior surface of radius
What’s the insertion of the Flexor policis longus?
base of the distal phalanx of thumb
What’s the function of the Flexor policis longus?
Flexion of the distal phalanx of the thumb
What’s the nerve passing the Flexor policis longus?
Median nerve
Pronator quadratus muscle
What is the origin of the Pronator quadratus muscle?
Lower part of the ulna
What’s the insertion of the Pronator quadratus muscle?
Lower part of the radius
What’s the function of the Pronator quadratus muscle?
Pronates the forearm
What’s the nerve passing through the Pronator quadratus muscle?
Median nerve
What’s the difference between brevis and longus?
Brevis: proximal phalanx
Longus: distal phalanx (long can reach)
What is the cubital fossa?
Triangular fossa in front of the elbow joint
Cubital fossa
What’s the medial border of the cubital fossa?
pronator teres
What’s the lateral border of the cubital fossa?
Brachioradialis muscle
What’s the base of the cubital fossa?
Line passing through the epicondyle
What’s the apex of the cubital fossa?
Where the lateral and medial border meet.
What’s the floor of the cubital fossa?
Supinator and brachialis muscle
What’s the content of the cubital fossa?
Median nerve, Brachial artery, and Tendon of the biceps brachii muscle
What arteries intervene( supply) each other?
Ulnar artery→ Common interosseous artery → Anterior and Posterior interosseous artery
What nerves intervene( supply) each other?
Median nerve→ Anterior interosseous nerve
What type of nerve is the median nerve?
Mixed nerve (sensory fibers-hand muscles and motor fibers-forearm region)
What type of nerve is the Ulnar nerve?
Mixed nerve (sensory fibers and motor fibers
What is the location of the Ulnar nerve?
Behind the flexor carpi ulnaris muscle
What 2 muscles does the Median nerve not pass through?
Flexor carpi ulnaris
Ulnar/medial side of Flexor digitorum profundus