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.
What clinical finding would be seen in a compression or injury of the radial nerve high in the axilla or proximal arm?
Wrist drop - inability to extend wrist and fingers at MCP.
Triceps very rarely if ever weakened.
What causes Handcuff palsey?
Damage of the superficial branch of the radial nerve at the wrists leading to numbness over the dorsum of the hand between Mc I and Mc II.
