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