Forearm Flashcards
Forearm anterior compartment has how many muscles?
8
All the forearm anterior muscles are innervated by what nerve? All except?
median
1.5 muscles
Forearm posterior compartment has how many muscles?
11
All the posterior compartment muscles are innervated by the …nerve.
radial
Anterior and posterior compartments of the forearm are separated by the …
interosseous membrane
Two major groups of the anterior forearm muscles
superficial
deep
Superficial group forearm muscles
pronator teres flexor carpi radialis palmaris longus flexor carpi ulnaris flexor digitorum superficialis
Deep group of forearm muscles
flexor digitorum profundus
flexor pollicis longus
pronator quadratus
The superficial group of forearm muscles attach via the medial epicondyle through a common …. and they all cross at the …joint.
flexor tendon
elbow
What muscle is a strong pronator?
pronator teres
What muscle flexes and radially deviates the wrist simultaneously?
flexor carpi radialis
What muscle is absent in 17% caucasians?
palmaris longus
What muscle inserts on the pisiform and hook of hamate?
flexor carpi ulnaris
What is the function of flexor carpi ulnaris?
flex and adduct the hand/wrist
What nerve innervates the flexor carpi ulnaris?
ulnar nerve
What does the flexor digitorum superficialis do and what nerve innervates it?
flexes the proximal interphalangeal joint and median nerve
Where does the flexor digitorum profundus originate?
ulna and anterior interosseous membrane
What does the digitorum profundus do?
flexes the distal interphalangeal joint
The lateral part of the digitorum profundus that serves the 2nd and 3rd digits, is innervated by .. nerve. The medial part that serves the 4th and 5th digits is innervated by the …nerve.
median
ulnar
Flexor pollicis longus originates from..
radius and anterior interosseous membrane
What is the only muscle that flexes the distal interphalangeal joint of the thumb?
flexor pollicis longus
What nerve innervates the flexor pollicis longus?
median
What does the pronator quadratus do?
pronates the forearm
The ulnar nerve innervates the … muscle of the ….
flexor carpi ulnaris
flexor digitorum profundus
Muscular branch of the median nerve innervates all the … muscles except the flexor carpi ulnaris and the medial half of FDP.
flexor forearm
Branches of the median nerve
anterior interosseous nerve
palmar cutaneous branch of median nerve
recurrent branch of median nerve
What is anterior interosseous syndrome?
inability to form an okay sign. There is an impairment of the innervation of flexor digitorium profundus and flexor pollicis longus muscle
The recurrent branch of the median nerve loops around the distal border of the ligament and supplies the 3… muscles.
thenar
The palmar carpal ligament is the continuation of the…
extensor reticulum
Median nerve injury sign
hand of benediction when asked to form a fist
Ulnar nerve continues in between the … and …
flexor carpi ulnaris
FDP
Ulnar canal or canal of guyon is a …
groove between the pisiform and the hook of hamate bones
Muscular branches of the ulnar nerve supplies the…
flexor carpi ulnaris and the meidal/unlar half of the FDP
Ulnar nerve injury characterisitc
clawhand
Cubital tunnel syndrome
ulnar nerve compression by flexor carpi ulnaris muscle
Branches of the ulnar artery
anterior interosseous artery
posterior interosseous artery
Radial artery is used as a ….for the separation of the flexors and extensor of the forearm.
demarcation
3 lateral posterior forearm muscles
brachioradialis, extensor carpi radialis longus, extensor carpi radialis brevis
3 posterior forearm muscles for the thumb
abductor pollicis longus
extensor pollicis brevis
extensor pollicis longus
3 posterior forearm muscle for the digits
extensor digitorum
extensor digiti minimi
extensor indicis
plus the extensor carpi ulnaris
Which muscle flexes the elbow joint: drinking muscle?
brachioradialis
What muscle extends, abducts, the wrist when clenching a fist?
extensor carpi radialis longus
and extensor carpi radialis brevis
Where is extensor carpi radialis in relation to brevis?
shorter nd deeper
Which muscle abducts and extends the thumb?
abductor pollicis longus
What muscle extends the thumb and forms the palmar border of the anatomical snuff box?
extensor pollicis brevis
What muscle adducts the thumb and forms the dorsal border of the anatomical snuff box?
extensor pollicis longus
Contents of the anatomical snuff box
extensor pollicis longus and brevis
radial artery
scaphoid
What muscle is the principle extensor of the medial/ulnar four digits?
extensor digitorum
