Posterior Extensor Compartment Flashcards
Which two superficial muscle attach to the lateral supra condylar ridge?
The brachioradialis and extensor carpii radialis longus.
What are the four superficial extensor muscles that attach to the lateral epincondyle via common extensor tendon?
The extensor digitorum, extensor carpi radial is brevis, extensor digiti minimi, and extensor carpi ulnaris.
Give origin, insertion, Innervation, and action of the brachioradilis?
Proximal two thirds of the lateral supra condylar ridge of the humerus to the lateral surface of the distal end of the radius and proximal to the styloid process.
Innervated: radial nerve C5-C7
Action: weak elbow flexor, but maximal when the arm is in the mid probated position
Give origin, insertion, Innervation, and action of the extensor capris radialis longus?
Lateral supra condylar ridge of the humerus to the dorsal aspect of the base of the second metacarpal.
Innervated: radial nerve C6-C7
Action: extends and abducts the wrist.
Give origin, insertion, Innervation, and action of the extensor carpi radialis brevis.
Lateral epicondyle of the humerus to the dorsal aspect of the base of the 3rd metacarpal.
Innervation: posterior interosseous nerve C7-C8
Actions: extends and abducts the wrist
Give origin, insertion, Innervation, and action of the extensor digitorum.
Common tendon of the lateral epicondyle of the humerus to the extensor expansions of the medial four fingers.
Innervated: posterior interosseous nerve C7-C8
Action: extension of the wrist and extend the medial four fingers at the metacarpophalangeal joints, and secondarily at the interphlangeal joints.
Give origin, insertion, Innervation, and action of the extensor digiti minimi.
Common tendon of the lateral epicondyle of the humerus to extensor expansion of the 5 the digit
Innervated: posterior interosseous nerveC7-C8
Action: extends the wrist and extends the 5 the digit primarily at the metacarpophalangeal joint and secondarily at the interphlangeal joint
Give origin, insertion, Innervation, and action of the extensor carpi ulnaris.
Lateral epicondyle of the humerus, posterior border of the ulna via a shared aponeurosis to the dorsal aspect of the base of the 5 the metacarpal
Innervated: extends and adducts the wrist joint
Give origin, insertion, Innervation, and action of the supinator.
Lateral epicondyle of the humerus, radial collateral ligament and annular ligaments, supinator fossa and crest of the ulna.
Innervated: deep branch of the radial nerve C7-C8
Actions: supinate a the forearm.
Give origin, insertion, Innervation, and action of the abductor policies longus.
Posterior surfaces of the proximal halves of the ulna, radius, and interosseous membrane to the base of the 1st metacarpal
Innervation: posterior interosseous nerve C7-C8
Action: extends at the wrist and abducts the thumb and it extends it at the carpometacarpal joint.
Give origin, insertion, Innervation, and action of the extensor policis longus.
Posterior surface of the middle third of the ulna and interosseous membrane to the dorsal aspect of the base of the distal phalanx of the thumb.
Innervation: posterior interosseous nerve C7-C8
Action: extends the wrist, extends the distal phalanx of the thumb at the interphlangeal joint metacarpophalangeal joint, carpometacarpal joint,
Give origin, insertion, Innervation, and action of the extensor policis brevis.
Posterior surface of the distal third of the radius and interosseous membrane to the dorsal aspect of the base of the proximal phalanx of the thumb.
Innervated: posterior interosseous membrane C7-C8
Actions: extends the wrist joint and the proximal, phalanx of the thumb at the metacarpophalangeal joint, and extends the carpometacarpal joint.
Give origin, insertion, Innervation, and action of the Extensor indicis
Posterior surface of the distal third of the ulna and interosseous membrane to the extensor expansion of the 2nd finger
Innervated: posterior interosseous nerve C7-C8
Action: extends the wrist and extends 2nd finger indecently
