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Anatomy Muscles of the Forearm
Muscles of the Anterior and Posterior Forearm Origin, Insertion, Innervation, Action, Blood Supply
26
Anatomy
Graduate
11/18/2012

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Cards

Term
Muscles of the Anterior Compartment of the Forearm Deep (3) and Superficial (5)
Definition
Deep

Flexor digitorum profundus
Flexor pollicis longus
Pronator Quadratus

Superficial

Pronator Teres
Flexor Carpi Radialis
Palmaris Longus
Flexor Carpi Ulnaris
Flexor Digitorum Superficialis
Term
Deep (5) and Superficial (6) Muscles of the Posterior Compartment of the Forearm
Definition
Superficial

Brachioradialis
Extensor carpi radialis longus
Extensor carpi radialis brevis
Extensor digitorum
Extensor digiti minimi
Extensor carpi ulnaris

Deep

Supinator
Abductor pollicis longus
Extensor pollicis brevis
Extensor pollicis longus
Extensor indicis
Term
Pronator Teres Origin, Insertion, Innervation, Action, Blood Supply
Definition
O: Ulnar head: coronoid process of ulna Humeral head: medial epicondyle of humerus

I: Middle of lateral surface of radius

N: Median Nerve

A: Pronates and Flexes forearm

B: ulnar artery and radial artery
Term
Flexor Carpi Radialis Origin, Insertion, Innervation, Action, Blood Supply
Definition
O: Medial epicondyle of humerus

I: Base of 2nd metacarpal

N: Median Nerve

A: Flexes and abducts hand

B: Ulnar Artery
Term
Palmaris Longus Origin, Insertion, Innervation, Action, Blood Supply

(10% of population missing this muscle--myself included!)
Definition
O: Medial epicondyle of humerus

I: Distal half of flexor retinaculum, apex of palmar aponeurosis

N: Median Nerve

A: Flexes hand

B: Ulnar artery
Term
Flexor Carpi Ulnaris Origin, Insertion, Innervation, Action, Blood Supply
Definition
O: Medial epicondyle of humerus

I: Base of 5th metatarsal

N: Ulnar Nerve

A: Ulnar Deviation, Flexion of the Wrist

B: Ulnar Artery
Term
Flexor Digitorum Superficialis Origin, Insertion, Innervation, Action, Blood Supply
Definition
O: Humeroulnar head: medial epicondyle of humerus, coronoid process of ulna Radial head: superior half of anterior border of radius

I: Shafts of middle phalanges of 2nd-5th fingers

N: Median Nerve

A: Flexes middle phalanges at proximal interphalangeal joints (all fingers except thumb)

B: Ulnar Artery
Term
Flexor Digitorum Profundis Origin, Insertion, Innervation, Action, Blood Supply
Definition
O: Anterior surface of ulna, interosseous membrane

I: Bases of distal phalanges of 2nd-5th fingers

N: Medial part: ulnar nerve
Lateral part: median nerve

A: Flexes distal phalanges at distal interphalangeal joints (all fingers except thumb)

B: Anterior interosseous artery
Term
Flexor Pollicis Longus Origin, Insertion, Innervation, Action, Blood Supply
Definition
O: Anterior surface of radius, interosseous membrane

I: Base of distal phalanx of thumb

N: Median nerve

A: Flexes phalanges of thumb

B: Anterior interosseous artery
Term
Pronator Quadratus Origin, Insertion, Innervation, Action, Blood Supply
Definition
O: Distal quarter of anterior surface of ulna

I: Distal quarter of anterior surface of radius

N: Median nerve

A: Pronates forearm

B: anterior interosseous artery
Term
Brachioradialis Origin, Insertion, Innervation, Action, Blood Supply
Definition
O: Lateral supraepicondylar ridge of humerus

I: Lateral surface of radius proximal to styloid process

N: Radial Nerve

A: Weak flexion of the forearm

B: Radial recurrent artery
Term
Extensor Carpi Radialis Longus Origin, Insertion, Innervation, Action, Blood Supply
Definition
O: Lateral supraepicondylar ridge of humerus

I: Base of 2nd metacarpal

N: Radial Nerve

A: Extends and abducts hand

B: Radial artery
Term
Extensor Carpi Radialis Brevis Origin, Insertion, Innervation, Action, Blood Supply
Definition
O: Lateral epicondyle of humerus

I: Base of 3rd metacarpal

N: Radial Nerve

A: Extends and abducts hand

B: Radial Artery
Term
Extensor Digitorum Origin, Insertion, Innervation, Action, Blood Supply
Definition
O: Lateral epicondyle of humerus

I: Extensor expansions of 2nd-5th fingers

N: Radial Nerve

A: Extends 2nd-5th fingers at metacarpophalangeal joints

B: Interosseous recurrent and posterior interosseous arteries
Term
Extensor Digiti Minimi Origin, Insertion, Innervation, Action, Blood Supply
Definition
O: Lateral epicondyle of humerus

I: Extensor expansion of 5th finger

N: Radial Nerve

A: Extends 5th finger at metacarpophalangeal joint

B: Interosseous recurrent artery
Term
Extensor Carpi Ulnaris Origin, Insertion, Innervation, Action, Blood Supply
Definition
O: Lateral epicondyle of humerus

I: Base of 5th metacarpal

N: Radial Nerve

A: Extends and adducts hand

B: Ulnar Artery
Term
Supinator Origin, Insertion, Innervation, Action, Blood Supply
Definition
O: Lateral epicondyle of humerus, radial collateral and anular ligaments, supinator fossa, crest of ulna

I: Lateral posterior and anterior surfaces of proximal 1/3 of radius

N: Radial Nerve

A: Supinates forearm (as if you didn't know that)

B: Recurrent interosseous artery
Term
Abductor Pollicis Longus Origin, Insertion, Innervation, Action, Blood Supply
Definition
O: Posterior surface of proximal 1⁄2 of ulna, radius and interosseous membrane

I: Base of 1st metacarpal

N: Radial Nerve

A: Abducts thumb, extends thumb at carpometacarpal joint

B: Posterior interosseous artery
Term
Extensor Pollicis Brevis Origin, Insertion, Innervation, Action, Blood Supply
Definition
O: Posterior surface of distal 1/3 of radius, interosseous membrane

I: Base of proximal phalanx of thumb

N: Radial Nerve

A: Extends proximal phalanx of thumb at metacarpophalangeal joint

B: Posterior interosseous artery
Term
Extensor Pollicis Longus Origin, Insertion, Innervation, Action, Blood Supply
Definition
O: Posterior surface of middle 1/3 of ulna, interosseous membrane

I: Base of distal phalanx of thumb

N: Radial Nerve

A: Extends distal phalanx of thumb at interphalangeal joint

B: Posterior interosseous artery
Term
Extensor Indicis Origin, Insertion, Innervation, Action, Blood Supply
Definition
O: Posterior surface of distal 1/3 of ulna, interosseous membrane

I: Extensor expansion of 2nd finger

N: Radial Nerve

A: Extends 2nd finger

B: Posterior interosseous artery
Term
What do all of the muscles of the posterior compartment of the forearm have in commmon?
Definition
They are ALL innervated by the Radial nerve
Term
Superificial Muscles of the forearm from medial to lateral
Definition
Brachioradialis
Protator Teres
Flexor Carpi Radialis
Palmaris Longus
Flexor Carpi Ulnaris

Deep to them but still considered superficial
Flexor Digitorum Superficialis
Term
Three Deep Muscles of the Anterior Forearm from Medial to Lateral
Definition
Flexor Digitorum Profundis
Flexor Policis Longus
Pronator Quadratus (Distal and Deep to FPL)
Term
The Ulnar Nerve Innervates What Two (one and a half) Muscles of the Anterior Forearm?

All of the other muscles of the Anterior Forearm are innervated by...?

How is this reversed when in the hand?
Definition
Flexor Carpi Ulnaris
Flexor Digitorum Profundus (Medial Half)

(runs inbetween these to muscles, FCU is superior)

all of the other anterior forearm muscles are innervated by the Median nerve

This is mostly reversed when in the hand in that the Median nerve innervates
one half of the lumbricals (the index and middle fingers)
and the three thenar muscles (Abductor pollicis brevis, flexor pollicis brevis, & opponens pollicis)
Term
What are colles and reverse colles fractures?
Definition
Colles’s fracture of the wrist is a distal radius fracture in which the distal fragment is displaced (tilted) posteriorly, producing a characteristic bump described as dinner (silver) fork deformity because the forearm and wrist resemble the shape of a dinner fork. If the distal fragment is displaced anteriorly, it is called a reverse Colles’s fracture (Smith’s fracture).
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