Session 9- Functional Anatomy Of The Hand And Wrist Flashcards
What are the muscles in the posterior compartment of the forearm commonly known as? What is the general function of the muscles?
The extensor muscles, the general function of the muscles is to produce extension at the wrist and fingers.
What are the extensor muscles innervated by?
Radial nerve.
The brachioradialis is a superficial extensor muscle with its origin and innervation being characteristic, what makes this muscle different?
It actually doesn’t extend, it flexes the elbow!
What are the actions of Carpi radialis longus and brevis?
Extension and abduction of the wrist.
What are the attachments of the ECRL and the ECRB?
THE ECRL originates from the supracondylar ridge, while the ECRB originates from the lateral epicondyle, their tendons attach to metacarpal bones 2 and 3.
What are the attachments actions and innervation of the supination?
The origin is the lateral epicondyle of humerus and the insertion is the anterior, lateral and posterior surfaces of the proximal third of radius.
What is the action and neurovascular supply of the supinator?
SUPINATION of the forearm at the radioulnar joints.
The nerve supply is a deep branch of a radial nerve.
The arterial supply is recurrent interosseous artery, interosseous artery, radial recurrent artery.
What is the origin, insertion, action, neurovascular supply of the deep muscle extensor indices?
The extensor indices is inserted in the posterior surface of distal half of ulna; interosseous membrane. The insertion is the dorsal digital expansion of the 2nd digit (index finger).
The action is the extension of the wrist, extension of the metacarpophalangeal, proximal, proximal interphalangeal and distal interphalangeal joints of the 2nd digit.
The nerve supply is the POSTERIOR INTEROSSEOUS NERVE and the arterial supply is the POSTERIOR INTEROSSEOUS ARTERY.
What is the origin, insertion, action, nerve and arterial supply of the extensor pollicis brevis?
The origin is again the posterior surface of the distal half of the radius and the adjacent interosseous membrane. The insertion is the dorsal surface of base of proximal phalanx of 1st digit (thumb).
Action is the extension of the thumb at the interphalangeal joint, it can also extend the metacarpophalangeal and carpometacarpal joints of the thumb.
The nerve supply is the posterior interosseous nerve and the arterial supply is the posterior interosseous artery, anterior interosseous artery.
What is the origin, insertion, neurovascular supply of the extensor pollicis longus?
The origin is the posterior surface of the middle third of the ulna and adjacent interosseous membrane.
The insertion is the dorsal surface of base of distal phalanx of the 1st digit ie: thumb.
The action is the extension of the thumb, it extends the interphalangeal joints of the 1st digit, extends the metacarpophalangeal and the carpometacarpal joint of the 1st digit.
The nerve supply is the posterior interosseous nerve.
The arterial supply is the posterior interosseous artery.
It is just above the extensor pollicis brevis.
Give the origin, insertion, action, nerve supply and arterial supply of the abductor pollicis longus.
The abductor pollicis longus is on the right to the extensor pollicis longus.
The origin in the posterior surface of the middle third of the radius, ulna and interosseous membrane.
The insertion is the base of the 1st metacarpal.
The action is the abduction of the carpometacarpal joint of the 1st digit, the accessory extensor of the 1st digit.
The nerve supply is the posterior interosseous nerve and the artery is the posterior interosseous artery.
Give the origin, insertion, action, nerve and arterial supply of the extensor digiti minimi.
The origin: The lateral epicondyle of humerus via common extensor tendon, inserts onto the dorsal digital expansion of the 5th digit.
Action: Extension and ulnar abduction of the wrist, abduction and extension of the metacarpophalangeal, proximal interphalangeal and distal interphalangeal joints of the 5th digit.
The nerve supply is the radial nerve
The arterial supply is recurrent interosseous artery, posterior, anterior.
What are the origin, insertions, actions, nerve and arterial supply of the extensor digitorum.
Origin- lateral epicondyle of the humerus.
Insertion- dorsal digital expansions of the 2nd-5th digits.
Action- extension of the wrist, extension of the metacarpophalangeal, proximal interphalangeal and distal interphalangeal joints of the 2nd-5th fingers, abduction of the fingers.
The nerve supply is the deep branch of radial nerve.
The arterial supply is recurrent interosseous artery.
What are the origins, insertions, actions and neurovascular structures of the anconeus?
Origin- posterior surface of lateral epicondyle of humerus.
The insertion of the lateral surface of the olecranon; posterior surface of superior surface of superior part of ulna.
Action- extension of the forearm.
Nerve supply- radial nerve
Arterial supply- reccurent interosseous artery.
What are the bones of the hand and what is the eunomic to remember the metacarpals?
You have the distal phalanges, middle phalanges, proximal phalanges, metacarpals, carpsals.
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