Posterior Arm and Forearm Flashcards
What is the origin, insertion, innervation, and action of the triceps brachi?
O: 3
Long head: Infraglenoid tubercule of the scapula.
Lateral head: Posterior surface of humerus superior to radial goorve.
Medial head: Posterior surface of humerus inferior to radial groove.
Insertion:Proximal end of olecranon process
Action: Extends the arm (Long hea) extends forearm.
Innervation: Radial nerve.
What is the origin, insertion, innervation, and action of the Anconeus?
Origin: Lateral epicondyle of humerus
Insertion: Lateral surface of olecranon and proximal surface of ulna.
Actions: Assists in extension of forearm and stabilizes the elbow.
What is the origin, insertion, innervation, and action of the Brachio radialis?
O: Lateral supracondylar ridge of humerus.
I: Styloid process of radius.
Innervation: Radial nerve
Action: THE ONLY FLEXOR OF FOREARM IN THE POSTERIOR COMPARTMENT.
What is the origin, insertion, innervation, and action of the extensor carpi radialis longus?
O: Lateral supraconylar ridge of humerus
I: Dorsal base of MC II.
Innervation: Radial nerve
Action: extends and abducts the wrist.
What is the origin, insertion, innervation, and action of the extensor carpi radialis brevis?
O: Lateral epicondyle of the humerus.
I: Dorsal base of MC II
Innervation: Deep branch of radial nerve
Action: Extends and abducts the wrist.
What is the origin, insertion, innervation, and action of the extensor carpi ulnaris
O: Lateral epicondyle of the humerus
I: Dorsal base of MC 5
Innervation: Deep branch of radial
Action: extends and adducts the wrist.
What is the origin, insertion, innervation, and action of the extensor digitorum?
O: lateral epicondyle of the humerus
I: extensor expansion of digits 2-4
Innervation: Deep branch of radial nn
Action: Extends digits 2-5 at all joints also extending the wrist.
What is the origin, insertion, innervation, and action of the Extensor digiti minimi?
O: Lateral epicondyle of humerus
I: extensor expansion of digit 5
Innervation: Deep branch of the radial n.
Action: extends digit 5 at all joints extending and adducting the wrist.
What is the origin, insertion, innervation, and action of the supinator?
O: Lateral epicondyle of the humerus; posterior olecranon process.
I: proximo-lateral radius
Innervation: Deep branch of radial n.
Action: Supination!
What is the origin, insertion, innervation, and action of the abductor pollicis longus?
Proximal attachment: Posterior ulna, radius, interosseous membrane.
Insertion: distal attachment of base of MC1
Innervation: Posterior interosseous nerve
Action: Abducts pollex.
What is the origin, insertion, innervation, and action of the extensor pollicus longus?
O: Posterior ulna, interosseous membrane
I: base of distal phalanx of pollex
Innervation: posterior interosseous nerve
Action: extends pollex at all joints.
What is the origin, insertion, innervation, and action of the extensor pollicis brevis?
O: Posterior radius, interoseus membrane
I: Base of proximal phalanx of pollex
Innervation: Posterior interosseus nerve
Action: Extends pollex at MCP joint.
What is the origin, insertion, innervation, and action of the extensor indicis?
O: Posterior ulna, interosseus membrane
I: Extensor expansion of digit 2
Innervation: Posterior interosseous nerve
Action: extends the indicis.
What are the contents of the triangular interval and what are its borders?
Radial nerve and the deep brachial artery (Brachial profundus)
Lateral border - Lateral head of triceps
Medial border - Long head of triceps
Superior border - Teres Major
What does the anatomical snuff box contain?
The radial artery and the superficial branch of the radial nerve innervating its overlaying skin.
