10/6 Posterior Forearm - Brauer Flashcards
What muscles make up the superficial group of the posterior antebrachium (forearm)? 3
Brachioradialis
Extensor carpi radialis longus
Extensor carpi radialis brevis
Extensor digitorum longus
Extensor digiti minimi
Extensor carpi ulnaris
What muscles make up the Deep group of the posterior antebrachium (forearm)? 3
Supinator
Abductor pollicis longus
Extensor pollicis longus
Extensor indicis
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Where does the Brachioradialis m. originate from and insert into? What innervates it? What is its action?
O —> Supraepicondylar ridge of humerus
Insertion:
lateral distal radius
Proximal styloid process
N —> superficial branch of radial n.
Action:
Weak arm flexion (best when mid-pronated)
Where does the Extensor carpi radialis longus m. originate from and insert into? What innervates it? What is its action?
O —> lateral supraepicondylar ridge of humerus
I —> dorsal side of 2nd metacarpal
N —> Deep branch of radial n.
Action:
Extends hand at wrist
Abducts hand at wrist
Where does the Extensor carpi radialis brevis m. originate from and insert into? What innervates it? What is its action?
O —> lateral epicondyle of humerus
I —> 3rd metacarpal
N —> Deep branch of radial n.
Action:
Extends hand at wrist
Abducts hand at wrist
Where does the Extensor carpi Ulnaris longus m. originate from and insert into? What innervates it? What is its action?
Origin:
Lateral epicondyle
Posterior Ulna aponeurosis
I —> 5th metatarsal
N —> deep branch of radial n.
Action:
Extends hand at wrist
Adducts hand at wrist
Where does the Extensor digitorum m. originate from and insert into? What innervates it? What is its action?
O —> lateral epicondyle
I —> medial 4 digits (extensor expansion)
N —> Deep branch of radial n.
A —> extends >MPJ and
Where does the Supinator m. originate from and insert into? What innervates it? What is its action?
Deep group
Origin:
Deep portion originates from ulna
Superficial lateral condyle
Insertion:
Radial tubercle
Oblique line of radius
N —> Deep branch of radial n.
A —> supinates forearm
Where does the Extensor indices m. originate from and insert into? What innervates it? What is its action?
Origin:
Distal ulna
Interosseous membrane
I —> 2nd digit (extensor expansion)
N —> posterior interosseous branch of radial n.
Action:
Extends 2nd digit
Assists extension of hand at the wrist
Where does the Abductor pollicis longus m. originate from and insert into? What innervates it? What is its action?
Deep group
Origin:
Ulna
Radius
Interosseous membrane
I —> 1st metacarpal
N—> deep branch of radial n.
Action:
Abducts thumb
Extends carpometacarpal joint
Where does the Extensor pollicis longus m. originate from and insert into? What innervates it? What is its action?
Origin:
Ulna
Interosseous membrane
I —> distal phalanx of thumb
N —> Deep branch of radial n.
Action:
Extend distal phalanx @ IPJ
Extends MPJ
Extends carpometacarpal joints
Where does the Extensor pollicis brevis m. originate from and insert into? What innervates it? What is its action?
Origin:
Distal radius
Interosseous membrane
I —> proximal phalanx of thumb
N —> deep branch of radial n.
Action:
Extends proximal phalanx of thumb at MPJ
Extends carpometacarpal joint
Radial recurrent a.:
brachioradialis
Supinator m.
Radial a.:
Ext. carpi radialis longus
Ext. carpi radialis brevis
Common interosseous a.: Ext. digitorum longus m. Abductor pollicis longus Extensor pollicis longus Extensor indicis
Interosseous recurrent a.:
Ext. digiti minimi
Ulnar a.:
Ext. carpi ulnaris
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