Upper Limb 3 Flashcards
Muscles that extend and abduct or adduct the hand at the wrist joint.
Extensor carpi radialis longus
Extensor carpi radialis brevis
Extensor carpi ulnaris
Muscles that extend or abduct the thumb
Abductor pollicis longus
Extensor pollicis brevis
Extensor pollicis longus
Muscles that extend the medial four fingers.
Extensor digitorum
Extensor indicis
Extensor digiti minimi
Muscles of posterior compartment of forearm - Superficial layer
Brachioradialis Extensor carpi radialis longus Extensor carpi brevis Extensor digitorum Extensor digiti minimi Extensor carpi ulnaris
Muscles of posterior compartment of forearm - Deep layer
Supinator Extensor indicis Abductur pollicis longus Extensor pollicis longus Extensor pollicis brevis
Brachioradialis - attachment, innervation, action
Proximal: proximal 2/3 of the supra-epicondylar ridge of humerus.
Distal: lateral surface of distal end of radius proximal to styloid process.
Innervation: Radial nerve.
Action: Weak flexion of forearm.
Extensor carpi radialis longus - attachment, innervation, action
Proximal: Lateral supra-epicondylar ridge of humerus.
Distal: Base of 2nd metacarpal.
Innervation: Radial nerve.
Action: Extend and abduct hand at the wrist joint, also active during fist clenching.
Extensor carpi radialis brevis - attachment, innervation, action
Proximal: Lateral epicondyle of humerus (common extensor origin).
Distal: Base of 3rd metacarpal.
Innervation: Deep branch of radial nerve.
Action: Extend and abduct hand at wrist joint.
Extensor digitorum - attachment, innervation, action
Proximal: Lateral epicondyle of humerus (common extensor origin).
Distal: Extensor expansion of medial four digits.
Innervation: Deep branch of radial nerve.
Action: Extends medial four digits.
Extensor digiti minimi - attachment, innervation, action
Proximal: Lateral epicondyle of humerus (common extensor origin).
Distal: Extensor expansion of 5th digit.
Innervation: Deep branch of radial nerve.
Action: Extends 5th digit.
Extensor carpi ulnaris - attachment, innervation, action
Proximal: Lateral epicondyle of humerus (common extensor origin)
Distal: Base of 5th metacarpal.
Innervation: Deep branch of radial nerve.
Action: Extends and adducts hand at wrist, also active during fist clenching.
Supinator - attachment, innervation, action
Proximal: Lateral epicondyle of humerus, radial collateral and anular ligaments, supinator fossa, crest of ulna.
Distal: Lateral, posterior, and anterior surfaces of proximal third of radius.
Innervation: Deep branch of radial nerve.
Action: Supinates forearm, rotates radius to turn palm anteriorly or superiorly when the elbow is flexed.
Extensor indicis - attachment, innervation, action
Proximal: Posterior surface of distal third of ulna and interosseous membrane.
Distal: Extensor expansion of 2nd digit.
Innervation: Posterior interosseous nerve, continuation of deep branch of radial nerve.
Action: Extends 2nd digit (enabling its independent extension), helps extend hand at wrist.
Abductor pollicis longus - attachment, innervation, action
Proximal: Posterior surface of proximal halves of ulna, radius, and interosseous membrane.
Distal: Base of 1st metacarpal.
Innervation: Posterior interosseous nerve, continuation of deep branch of radial nerve.
Action: Adducts thumb and extends it at carpometacarpal joint.
Extensor pollicis longus - attachment, innervation, action
Proximal: Posterior surface of middle third of ulna and interosseous membrane.
Distal: Dorsal aspect of base of distal phalanx of thumb.
Innervation: Posterior interosseous nerve, continuation of deep branch of radial nerve.
Action: Extends distal phalanx of thumb, extends metacarpophalangeal and carpometacarpal joints.
Extensor pollicis brevis - attachment, innervation, action
Proximal: Posterior surface of distal third of radius and interosseous membrane.
Distal: Dorsal aspect of base of proximal phalanx of thumb.
Innervation: Posterior interosseous nerve, continuation of deep branch of radial nerve.
Action: Extends proximal phalanx of thumb.
Arteries of forearm and wrist, proximal to distal.
Ulnar artery -Anterior and posterior ulnar recurrent a. -Common interosseous a. -Anterior and posterior interosseous a. -Recurrent interosseous a. -Palmar carpal branch. -Dorsal carpal branch. Radial -Radial recurrent a. -Palmar carpal branch. -Dorsal carpal branch.
Branches of median nerve in forearm.
Anterior interosseous
Palmar cutaneous branch if median nerve
Branches of ulnar nerve in forearm
Palmar cutaneous branch of ulnar nerve.
Dorsal cutaneous branch of ulnar nerve.
Branches of the radial nerve in forearm
Posterior cutaneous nerve of forearm.
Superficial branch of radial nerve.
Deep branch of radial/posterior interosseous nerve.
Thanar muscles
Opponens pollicis. Abductur pollicis brevis. Flexor pollicis brevis. -Superficial head -Deep head Abductur pollicis -Oblique head -Transverse head
Hypothenar muscles
Abductur digiti minimi.
Flexor digiti minimi brevis.
Opponens digiti.
Short muscles
Lumbricals -1st and 2nd -3rd and 4th Dorsal interossei, 1st-4th. Palmar interossei, 1st-3rd.
Branches of median nerve in hand
Recurrent (thenar) branch of median nerve.
Lateral branch of median nerve.
Medial branch of median nerve.
Palmar cutaneous branch of median nerve.
Branches of ulnar nerve in hand
Palmar cutaneous branch of ulnar nerve.
Dorsal branch of ulnar nerve.
Superficial branch of ulnar nerve.
Deep branch of ulnar nerve.
Branch of radial nerve in hand
Superficial branch of radial nerve.
Muscles attaching to the common extensor origin?
Extensor carpi radialis brevis, Extensor digitorum, Extensor digiti minimi, Extensor carpi ulnaris, Supinator.
