ORIGIN
These 4 finger/wrist extensor muscles originate from the common extensor tendon from the lateral epicondyle of the humerus.
What are the Extensor Carpi Radialis Brevis, Extensor Carpi Ulnaris, Extensor Digitorum, and Extensor Digiti Minimi?
The Brachialis inserts on these 2 bony landmarks.
What are the ulnar tuberosity and the coronoid process of the ulna?
This nerve innervates the wrist extensors and the Supinator.
What is the Radial Nerve?
These 4 muscles are wrist/finger extensors.
What are the Extensor Carpi Radialis Longus, Extensor Carpi Radialis Brevis, Extensor Carpi Ulnaris, and Extensor Digitorum?
The tendons of these 3 muscles make up the anatomical snuffbox.
DAILY DOUBLE!!!
What are the Extensor Pollicis Longus, Extensor Pollicis Brevis, and Abductor Pollicis Longus?
These 2 Hypothenar muscles originate from the Hook of Hamate and Flexor Retinaculum.
What are the Flexor Digiti Minimi Brevis and Opponens Digiti Minimi?
This muscle inserts on the dorsal bases of middle and distal phalanges of digits 2-5.
What is the Extensor Digitorum?
This nerve innervates most of the anterior forearm flexor muscles and the pronators (pronator teres & pronator quadratus).
What is the Median Nerve?
These 5 muscles are wrist/finger flexors.
What are the Flexor Carpi Radialis, Palmaris Longus, Flexor Carpi Ulnaris, Flexor Digitorum Superficialis, and Flexor Digitorum Profundus?
These 3 muscles make up the Thenar Eminence.
What are the Abductor Pollicis Brevis, Flexor Pollicis Brevis, and Opponens Pollicis?
These 5 muscles originate from the common flexor tendon from the medial epicondyle of the humerus.
What are the Flexor Carpi Radialis, Palmaris Longus, Flexor Carpi Ulnaris (humeral head), Flexor Digitorum Superficialis, AND the Pronator Teres?
This muscle inserts on the palmar bases of the 2nd and 3rd metacarpals.
DAILY DOUBLE!!!
What is the Flexor Carpi Radialis?
This nerve innervates Flexor Carpi Ulnaris and the medial half of Flexor Digitorum Profundus.
What is the Ulnar Nerve?
This muscle flexes the distal interphalangeal joints of digits 2–5.
What is Flexor Digitorum Profundus?
This muscle is a weak elbow extensor located lateral to the olecranon process.
What is the Anconeus?
These 2 muscles originate DIRECTLY from the lateral epicondyle of the humerus, NOT from the common extensor tendon.
DAILY DOUBLE!!!
What are the Anconeus and the Supinator (also originates from the radial collateral ligament, annular ligament, and superior crest of the ulna)?
This muscle inserts into the pisiform, hook of hamate, and base of the 5th metacarpal.
What is the Flexor Carpi Ulnaris?
This nerve innervates the muscles of the Hypothenar Eminence.
What is the Ulnar Nerve (C7, C8, T1)?
These intrinsic hand muscles flex the MCP joints and extend the IP joints of digits 2–5.
What are the Lumbricals?
This muscle extends the 2nd digit of the hand.
What is the Extensor Indicis?
The Palmar Interossi originates from the bases of these bones.
What are the bases of the 1st, 2nd, 4th, and 5th metacarpals?
Fun Fact: The 3rd digit cannot ADDUCT, as adduction of the fingers is measured relative to the 3rd digit. It can only ABDUCT (move away from its own central line in a medial or lateral direction).
This muscle inserts on the palmar aspects of middle phalanges of digits 2-5 after its tendons split to allow another tendon to pass through.
What is Flexor Digitorum Superficialis?
These nerves innervate the Lumbricals of the hand.
What are the Ulnar and Median Nerves?
These intrinsic hand muscles abduct digits 2-4 at the MCP joints, and also assist with MCP flexion and IP extension.
What are the Dorsal Interossei?
Remember PAD & DAB =
*Palmar Interossi = ADDuction (PAD)
*Dorsal Interossi = ABDuction (DAB)
Lumbricals 1 and 2 are unique because they originate from the tendons of this muscle.
What is Flexor Digitorum Profundus?