lec 8 Flashcards
where do most posterior arm muscles come from
lateral epicondyle
brachiolradialis
-origin
-insertion
-function
superficial or deep layer of posterior compartment?
supracondylar ridge of humerus –> distal end of radius proximal to styloid process
- flex forearm (in mid pronation)
-beer drinking arm
-actually a flexor arm, even though in extensor/posterior compartment bc innervated bar radial nerve
superficial
extensor carpi radilias longus
-origin
-insertion
-function
superficial or deep layer of posterior compartment?
supracondylar ridge of humerus –> base of 2nd metacarpal
- extend hand
- radial deviate (abduct) wrist
- flex elbow; weak
superficial
extensor carpi radialis brevis
-origin
-insertion
-function
superficial or deep layer of posterior compartment?
lateral epicondyle of humerus –> base of 3rd metacarpal
- extend hand
- radial deviate/ abduct hand
superficial
mobile wad of 3
brachioradialis
extensor carpi radialis brevis
extensor carpi radialis longus
extensor digitorum
-origin
-insertion
-function
superficial or deep layer of posterior compartment?
lateral epicondyle of humerus (via common extensor tendon) –> distal and middle phalanges of fingers 2-5 (via dorsal digital expansion)
- extension of fingers 2-5 at MCP PIP and DIP joiunts
- extend hand
- extend elbow; weak
superficial
extensor digiti minimi
-origin
-insertion
-function
superficial or deep layer of posterior compartment?
lateral epicondyle of humerus –> middle and distal phalanges of little finger
- extend finger at PIP, DIP, MCP
- extend hand at wrist
- extend elbow
superficial
dorsal digital expansion/ extensor hoods
on dorsal side of digits; triangular tendinous aponeurosis
lumbrical and interossei muscles attach to their sides
extensor carpi ulnaris
-origin
-insertion
-function
superficial or deep layer of posterior compartment?
lateral epicondyle of humerus and ulna –> base of 5th metacarpal bone
- extend hand
- ulnar deviation. adduct
3.elbow extend weak
superficial
anconeous
-origin
-insertion
-function
superficial or deep layer of posterior compartment?
lateral epicondyle humerus –> olecranon process of ulna
- weak elbow extension
superficial
supinator
-origin
-insertion
-function
superficial or deep layer of posterior compartment?
ulna and lateral epicondyle of humerus –> radius
- supinate forearm
- 2 head have relationship with deep branch of radial nerve
deep
abductor pollicis longus
-origin
-insertion
-function
superficial or deep layer of posterior compartment?
ulna, radius and interosseous membrane –> base of 1st metacarpal
- abduct thumb at CMC
- extend thumb at CMC
- radial deviation hand at wrist
deep
extensor pollicis brevis
-origin
-insertion
-function
superficial or deep layer of posterior compartment?
radius and interosseous membrane –> base of proximal phalanx of thumb
- extend thumb at CMC and MCP
- extend hand
- radial deviation/ abduct hand
deep
extensor pollicis longus
-origin
-insertion
-function
superficial or deep layer of posterior compartment?
ulna and interosseous membrane –> base of distal phalanx of thumb
- extend thumb at CMC, MCP, IP joints
- extend wrist
- radial deviate/ abduct
deep
abductor pollicis longus vs extensor pollicis longus vs extensor pollicis brevis in where they originate and insert
–> all do radial deviate/ abduct hand, extend hand and extend thumb at some joints
abductor pollicis longus: radius and ulna to base of 1st metacarpal
extensor pollicis brevis: radius to proximal phalanx
extensor pollicis longus: ulna to distal phalanx
anatomical snuff box medial and lateral borders
-bones
-artery
medial borders: extensor pollicis longus
lateral borders: extensor pollicis brevis and abductor pollicis longus
-radial artery
scaphoid and tranpezium Sltp Ttch
medial epicondylitis; which sport and tendon
common flexor tendon; golf elbow
lateral epicondylitis; sport and tendon
common extensor tendon ; tennis
if injure posterior cord of brachial plexus which nerves are damaged and muscles effected
radial nerve
-extensor/posterior arm and forearm
-extension of arm, forearm, wrist, supinate
- wrist drop palsy
axillary nerve
-delts, teres minor;
-abduct and external rotate shoulder
sensory deficits: lateral shoulder, posterior forearm, lateral 3.5 digits (dorsal surface)
carpal arch
carpal tunnel and flexor retinaculum
9 tendons
-4 flexor digitorum superficialis
-4 flexor digitorum profundus
-1flexor polices longus
median nerve
intrinsic muscles of the hand
3 groups and what is the nerve
- thenar
- hypothenar
- central
median and ulnar nerves
thenar muscles; which nerve
thumb side
abductor pollicis brevis
flexor pollicis brevis
opponens pollicis
median nerve
hypothenar muscles; which nerve
pinky side
abductor digiti minimi
flexor digiti minimi brevis
opponens digiti minimi
ulnar nerve
central muscles of hand; which nerve
lumbricals (4) –> 2 median and 2 ulnar nerve
dorsal interosseous muscles (4)
palmar interossesou muscles (3)
adductor pollicis
–> ulnar nerve
abductor pollicis brevis
-origin
-insertion
-function
which group of hand and nerve
tubercles of scaphoid and trapezium and flexor retinaculum –> base of proximal phalanx of thumb
- abduction of thumb
thenar group, median nerve
flexor pollicis brevis
-origin
-insertion
-function
which group of hand and nerve
flexor retinaculum and trapezium –> base of proximal phalanx of thumb
- flexion of thumb
thenar, median nerve
opponens pollicis
-origin
-insertion
-function
which group of hand and nerve
flexor retinaculum and trapezium –> 1st metacarpal
- opposition of thumb
thenar group, median nerve
palmaris brevis
-origin
-insertion
-function
which group of hand and nerve
palmar aponeurosis –> skin of medial side of hand
- wrinkles skin; improve grip
hypothenar group; ulnar nerve
abductor digiti minimi
-origin
-insertion
-function
which group of hand and nerve
pisiform –> base of proximal phalanx of little finger
- abduct little finger
hypothenar
; ulnar
flexor digiti minimi brevis
-origin
-insertion
-function
which group of hand and nerve
flexor retinaculum and hook of hamate –> base of proximal phalanx of 5th finger
- flex 5th finger
hypothenar ulnar nerve
opponents digiti minimi
-origin
-insertion
-function
which group of hand and nerve
flexor retinacuclum and hook of hamate –> 5th metacarpal bone
- opposition of 5th finer
ulnar nerve and hypothenar group
biceps vs triceps origin
supraglenoid vs infraglenoid
adductor pollicis
-origin
-insertion
-function
which group of hand and nerve
oblique head: base of 2 and 3 metacarpal and capitate
transverse head: 3rd metacarpil
base of proximal phlanx of thumb
- adduct thumb
central and ulnar
–> bulk of 1st web is made by it
lumbricals
-origin
-insertion
-function
which group of hand and nerve
tendon of flexor digitorum profundus of each finger
lumbrical 1 to dorsal digital expansion of finger 2
lumbrical 2 DDE finger 3
lumbrical 3- finger 4
lumbrical 4- finger 5
–> 4 lumbricals for fingers 2-5
- flex 2-5 at MCP
- extend 2-5 at PIP and DIP
TATA moment
central group
median nerve: lumbricals 1 2
ulnar nerve: lumbricals 3 4
dorsal interosseous muscles
-origin
-insertion
-function
which group of hand and nerve
adjacent sides of metacarpals
1: lateral side of index
2: lateral side of middle
3: medial side of middle
4: medial side of ring
–> fingers 2, 3, 3, 4
- abduction of finger 234 at MCP
2.flex fingers 234 at MCP - extend fingers 234 at DIP and PIP
ulnar nerve; central group
dorsal interosseous vs palmar interosseous actions
DAB and PAD
dorsal abduction
palmnar adduction
which movements do dorsal, planar interosseous and lumbricals all do
flex extend
dorsal-abdDAB
palmar-addPAD
which joints do you usually flex fingers at vs extend fingers for intrinsic Hand muscles
flex- MCP
extend DIP and PIP
palmar interosseous muscles
-origin
-insertion
-function
which group of hand and nerve
anterior side (palmar interosseous) of metacarpal 2, 4, 5
–> base of proximal phalanges and dorsal digital expansions o
1 for index finger (2)
2. for ring (4)
3. for little (5)
- adduct 245 at MCP
- flex 245 at MCP
- extend 245 at DIP and PIP
centreal, ulnar nerve
