CHA 101L- Lab 4: Forearm II, Elbow, Wrist, and Hand I

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ulnar (medial) collateral ligament

anterior (strongest), oblique, posterior (weakest) bands

What nerve is paired with the posterior humeral circumflex artery?

axillary n.

anatomical snuff box

abductor pollicis longus, extensor pollicis brevis (lateral border), extensor pollicis longus (medial border); pain may indicate scaphoid fracture

What muscles does the ulnar nerve innervate?

flexor carpi ulnaris, flexor digitorum profundus (medial 1/2)

Tennis elbow

lateral epicondylitis

boundaries of cubital fossa

medial border: brachioradialis lateral border: pronator teres horizontal, proximal border between the epicondyles

golfer's elbow

medial epicondylitis

What is the vein most commonly used for venipuncture?

median cubital vein

What nerve runs deep to the flexor retinaculum?

median nerve

What nerve innervates most of the anterior compartment of the forearm?

median nerve (except FCU and medial 1/2 of FDP)

flexor digitorum profundus

origin: anterior ulna, interosseous membrane insertion: distal phalanx of digits 2-5 actions: flexion of DIP joints, flexion of PIP joints, flexion of MCP joints, flexion of wrist innervation: median nerve (digits 2, 3), ulnar nerve (digits 4, 5) notes: deep

pronator quadratus

origin: distal ulna insertion: distal radius actions: pronation of forearm innervation: median nerve notes: deep

extensor carpi radialis brevis

origin: lateral epicondyle of humerus insertion: 3rd metacarpal actions: extension of hand, abduction of hand innervation: radial nerve notes: superficial

extensor digiti minimi

origin: lateral epicondyle of humerus insertion: extensor expansion of digit 5 actions: extension of MCP joints, extension of IP joints of digit 5 innervation: radial nerve notes: superficial

extensor digitorum (communis)

origin: lateral epicondyle of humerus insertion: extensor expansion of digits 2-5 actions: extension of MCP joints, extension of wrist innervation: radial nerve notes: superficial, also known as extensor communis

extensor carpi ulnaris

origin: lateral epicondyle of humerus, ulna insertion: 5th metacarpal actions: extension of hand, adduction of hand innervation: radial nerve notes: superficial, ulna is deep to this muscle

supinator

origin: lateral epicondyle of humerus, ulna insertion: shaft of radius (proximal to pronator teres) actions: supination of forearm innervation: radial nerve notes: deep

extensor carpi radialis longus

origin: lateral supracondylar ridge insertion: base of 2nd metacarpal actions: extension of hand, abduction of hand innervation: radial nerve notes: superficial

brachioradialis

origin: lateral supracondylar ridge insertion: distal radius- anterior surface actions: flexion of forearm, supination of forearm innervation: radial nerve notes: superficial

flexor carpi radialis

origin: medial epicondyle of humerus insertion: 2nd metacarpal actions: flexion of hand, abduction of hand innervation: median nerve notes: superficial, more lateral then palmaris longus

flexor digitorum superficialis

origin: medial epicondyle of humerus insertion: middle phalanax of digits 2-5 actions: flexion of PIP joints, flexion of MCP joints, flexion of wrist innervation: median nerve notes: middle layer

palmaris longus

origin: medial epicondyle of humerus insertion: palmar aponeurosis actions: flexion of hand, tightening of flexor aponeurosis innervation: median nerve notes: superficial, more medial than FCR

flexor carpi ulnaris

origin: medial epicondyle of humerus insertion: pisiform, hamate, 5-metacarpal actions: flexion of hand, adduction of hand innervation: ulnar nerve notes: superficial

pronator teres

origin: medial epicondyle of humerus, coronoid process of the ulna insertion: lateral side of middle of radius actions: pronation of forearm, flexion of forearm innervation: median nerve notes: superficial

abductor pollicis longus

origin: posterior ulna, radius, interosseous membrane insertion: base of 1st metacarpal actions: abduction of digit 1, extension of digit 1 at CMC joint innervation: radial nerve notes: deep

flexor pollicis longus

origin: radius, interosseous membrane insertion: distal phalanx of digit 1 (thumb) actions: flexion of distal phalanx of digit 1 innervation: median nerve notes: deep

extensor pollicis brevis

origin: radius, interosseous membrane insertion: proximal phalanx of digit 1 actions: extension of digit 1 at MCP joint innervation: radial nerve notes: deep

extensor pollicis longus

origin: ulna, interosseous membrane insertion: distal phalanx of digit 1 actions: extension of digit 1 at IP joint innervation: radial nerve notes: deep

extensor indicis

origin: ulna, interosseous membrane insertion: extensor expansion of digit 2 actions: extension of digit 2 innervation: radial nerve notes: deep

What muscles does the median nerve innervate?

pronator teres, flexor carpi radialis, palmaris longus, flexor digitorum superficialis, flexor pollicis longus, 1/2 of flexor digitorum profundus, pronator quadratus

Which artery do we palpate when we take our pulse?

radial artery

consequences of ulnar nerve damage

radial deviation (FCR acts unopposed), lose flexion of DIP joints at the 4th and 5th digits

What nerve innervates the posterior compartment of the forearm?

radial nerve, or the posterior interosseous branch of the radial nerve

contents of the cubital fossa

1. biceps brachii tendon 2. brachial artery 3. median nerve 4. cephalic vein 5. basilic vein 6. median cubital vein

Which tendons pass deep to the flexor retinaculum?

4 tendons of flexor digitorum superficialis 4 tendons of flexor digitorum profundus 1 tendon of flexor pollicis longus

consequences of median nerve damage

FCU unopposed- adduct hand, ulnar deviation medially; lose: pronation, flexion of DIP and PIP of digits 2-3, flexion of IP joint

What nerve is paired with the deep brachial artery?

Radial n.

Nursemaid's elbow

dislocation of head of radius, pulled anteriorly from annular ligament

carpal tunnel

space between carpal bones and flexor retinaculum

carpal tunnel syndrome

the nine tendons bound by flexor retinaculum become inflamed and compress the median nerve

What nerve innervates flexor carpi ulnaris and flexor digitorum profundus?

ulnar nerve


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