Muscle Actions
This muscle flexes the wrist and abducts the hand.
What is flexor carpi radialis?
This large muscle sits most lateral on the forearm in anatomical position and helps with elbow flexion.
What is brachioradialis?
The common origin of many superficial forearm flexors.
What is the medial epicondyle of the humerus?
Flexor carpi radialis inserts into these two metacarpals.
What are the bases of the second and third metacarpals?
This muscle is absent in about 10–15% of the population.
What is palmaris longus?
This deep muscle flexes the distal interphalangeal joints of digits 2–5.
What is flexor digitorum profundus?
The flexor carpi ulnaris lies on this side of the forearm.
What is the ulnar (medial) side?
Flexor digitorum profundus originates from this part of the ulna.
What is the proximal three-quarters of the anterior and medial surfaces?
Brachioradialis inserts here.
What is the styloid process of the radius?
This muscle is often used as a landmark for locating the radial artery.
What is flexor carpi radialis?
This muscle extends the wrist and is named for its long tendon near the thumb.
What is extensor pollicis longus?
This muscle group lies on the hairy side of the forearm.
What are the extensors?
Flexor pollicis longus originates from the anterior surface of this bone.
What is the radius?
Palmaris longus inserts into this thick connective tissue in the palm.
What is the palmar aponeurosis?
This muscle allows you to touch your thumb to your pinky — it's responsible for opposition.
What is opponens pollicis?
This muscle assists in supinating the forearm and is located deep to the brachioradialis.
What is supinator?
The thenar muscles are located at the base of this digit.
What is the thumb (first digit)?
The extensor carpi radialis longus originates just above this bony landmark.
What is the lateral epicondyle (specifically the lateral supracondylar ridge)?
Flexor carpi ulna's inserts on the base of the fifth metacarpal bone, the pisiform and this boney landmark.
What is the hook of hamate?
These muscles have no bony attachments and are named after an earthworm.
What are the lumbricals?
The short muscles of the thumb comprise this.
What is the thenar eminence?
This group of muscles are located on the (mostly) hairless side of the forearm.
What are the flexors?
Opponens pollicis originates from this carpal bone and the flexor retinaculum.
What is the trapezium?
Adductor pollicis inserts into this bone at the base of the thumb.
What is the base of the proximal phalanx of the thumb (via the ulnar sesamoid)?
This muscle tenses the palmar aponeurosis (old smacky).
What is palmaris longus?