Forearm & Wrist Muscles
This muscle flexes the wrist, abducts the wrists and assists with radial deviation; it inserts onto the base of the 2nd and 3rd metacarpals.
What is Flexor Carpi Radialis (FCR)?
This muscle supinates the forearm and flexes the elbow, especially against resistance.
What is the biceps brachii?
The roof of the carpal tunnel is formed by this structure.
What is the transverse carpal ligament?
This nerve passes through Guyon’s canal.
What is the ulnar nerve?
This artery travels through Guyon’s canal.
What is the ulnar artery?
This deep forearm muscle is the primary pronator and originates at the medial, anterior surface of the distal ulna.
What is Pronator Quadratus?
The Flexor Carpi Ulnaris (FCU) inserts onto these structures.
What are the pisiform, hook of hamate, and base of 5th metacarpal?
This nerve passes through this structure.
What is the median nerve?
Guyon’s canal lies between these two carpal bones.
What are the pisiform and the hook of hamate?
This compartment contains Abductor Pollics Longus (APL) and Extensor Pollicis Brevis (EPB).
What is Compartment I?
This muscle inserts into the anterior, lateral surface of the proximal one-third of the radial shaft.
What is the supinator?
The Extensor Carpi Radialis Longus (ECRL) is primarily innervated by this nerve.
What is the radial nerve?
How many tendons pass through the carpal tunnel?
What is 9?
The median nerve supplies sensation to these digits.
What are digits 1–3?
The Extensor Carpi Ulnaris (ECU) tendon is found in this extensor compartment.
What is Compartment VI?
This muscle inserts into the base of the third metacarpal and originates at the common extensor tendon from the lateral epicondyle of the humerus.
What is the Extensor Carpi Radialis Brevis (ECRB)?
This muscle inserts into the middle of the lateral surface of the radius and pronates the forearm.
What is pronator teres?
Name the only thumb flexor tendon that travels through the tunnel.
What is FPL (flexor pollicis longus)?
This nerve provides dorsal hand sensation but no motor function to the hand.
What is the superficial branch of the radial nerve?
Extensor Pollicis Longus (EPL) passes around Lister’s tubercle through this compartment.
What is Compartment III?
Name the action, origin, insertion, and innervation of the Palmaris Longus (PL)?
Action: Tenses the palmar fascia, flexes the wrist, & may assist to flex the elbow.
Origin: Common flexor tendon from the medial epicondyle of the humerus
Insertion: Flexor retinaculum and palmar aponeurosis
Innervation: Median
Name the action, origin, insertion, and innervation of the Extensor Carpi Ulnaris (ECU).
Action: Extend the wrist, adduct the wrist, ulnar deviation
Origin: Common extensor tendon from the lateral epicondyle of the humerus
Insertion: Base of the fifth metatarsal
Innervation: Radial Nerve
The carpal tunnel floor is formed by these structures.
What are the carpal bones?
The ulnar nerve provides sensation to these digits.
What is the medial 1 ½ digits (ring + little finger)?
This extensor compartment contains the Extensor Digitorum (ED) & Extensor Indicis (EI).
What is Compartment IV?