UE (Exam 2) Muscles/Attach/Innervat Flashcards
Palmar Interossei
Deep Ulnar N C8,T1
metacarpal shaft//extensor expansion
MCP flex, ext PIP/DIP, MCP adduct
Intermetacarpal compartment
Dorsal Interossei
Deep Ulnar N: C8,T1
Metacarpal shaft//extensor expansion
Flex MCP, extend PIP/DIP, MCP abd
Intermetacarpal compartment
adductor pollicis
Deep Ulnar N: C8,T1 Origin: -Transverse head:3rd MC shaft -Oblique head: capitate/trapezoid & base of their MC's Insertion: proximal phalanx of thumb
Action:
- ulnar adduction of thumb
- adduct CMP, flex MCP of thumb
part of adductor compartment
Lumbricals
Digits 2,3: median N C8,T1
Digits 4,5: deep Ulnar N C8,T1
FDP tendon//extensor expansion (slightly distal to interossei)
Flex MCP, extend PIP/DIP
Abductor Digiti Minimi
Deep Ulnar N: C8,T1
Origin: flexor retinacul, pisiform
insert: ulnar side of prox phalanx of little finger
action: abd CMC, MCP
Hypothenar compartment
flexor digiti minimi brevis
deep Ulnar N C8,T1 O:flexor retinacul, hook of hamate I: lnar side of base of prox phalanx A:flex CMC, MCP Hypothenar compartment
opponens digiti minimi
deep ulnar N: C8,T1
O:flexor retinacul, hook of hamate
I: body of MC of little finger (ulnar side)
A: circumduction of little finger toward thumb by flex, med rot of MC @ CMC jt
Hypothenar compartment
Palmaris Brevis
superficial Ulnar N C8,T1 O:palmar aponeurosis, flex retinacul I:skin over hypothenar compartment A:pulls skin over hypothenar toward mid palm-->protect ulnar A&N Hypothenar compartment
Abductor Pollicis Brevis
recurrent branch of median N C8,T1
O: flexor retinacul, tubercle of scaphoid/trapezium
I: palmar radial side of base of prox thumb
A:radial abd of thumb @ CMC; assist in opposition
Thenar compartment
flexor pollicis brevis
superficial head:recurrent branch of median N C8,T1
deep head: deep ulnar N C8, T1
O: tubercle of trapezium, flex retinacul
I:palmar radial side of base of prox thumb
A: flex MCP, CMC
thenar compartment
Opponens pollicis
recurrent branch of median N C8,T1
O: flexor retinacul, tubercle of trapezium
I:radial side of MC
A:circumduction of thumb toward mid palm, medial rotation of MC (both at CMC)
Thenar compartment
supinator
deep radial N C5,6
O: supinator crest, lat epi, RCL and annular lig
I:dorsal, lateral, palmar surface of prox radius
A: supinate @ prox rad-uln jt; stabilize prox rad-uln jt
Deep posterolateral compartment of forearm
Abductor pollicis longus
deep radial N C7,8
O: posterior surface of middle ulna & radius; interosseous memb
I: dorsal base of MC
A: abd of CMC, radial dev, assists in supination
Deep posterolateral compartment of forearm
Extensor Pollicis Longus
deep radial N C7,8
O: posterior surface of middle ulna; interosseous memb
I:dorsal base of distal thumb
A: extension of IP, MCP, CMC; Radial dev; assists in supination
deep posterolateral forearm
extensor pollicis brevis
deep radial N C7,8
O: posterior surface of middle radius; interosseous memb
I:dorsal base of prox thumb
A:extension of MCP, CMC; rad dev; assists in supination
deep posterolateral forearm
Extensor indicis
deep radial N C7,8
O: posterior surface of distal ulna; interosseous memb
I: extensor assembly of index finger
A: extension of DIP, PIP, MCP, CMC, wrist
deep posterolateral forearm
brachioradialis
radial N C5,6
O: prox lateral supracondylar ridge
I: lateral base, styloid process of radius
A:flex humeroulnar, humeroradial jts, assists in supination to neutral
superficial lateral group
extensor carpi radialis longus
radial N C6,7 O:distal lateral supracondylar ridge I: base of 2nd MC A: extension of radial wrist, radial deviation superficial lateral group
extensor carpi radialis brevis
deep radial N C7 O:lateral epi via common ext tend; Rad Collateral Lig I: base of 3rd MC A: wrist ext superficial lateral group
extensor digitorum
deep radial N C7,8 O: lateral epi (common ext tend) I: extensor assembly D2-5 A: extension of DIP, PIP, MCP, wrist superficial posterior compartment of forearm
extensor digiti minimi
deep radial N C7,8 O: lat epi (common ext tend) I: extensor assembly of little finger A: extend DIP, PIP, MCP of little finger superficial posterior group
extensor carpi ulnaris
deep radial N C7,8 O: lateral epi (common ext tend), post ulna I:dorsal base of 5th MC A: ext of ulnar side of wrist; ulnar dev superficial posterior group
pronator teres
median N C6,7
O: medial epi (common flex tend); coronoid process
I: middle 1/3 of lateral radius
A: pronation @ prox/dist radioulnar jt; elbow flex; stabilize prox radioulnar jt.
Anteromedial compartment
flexor carpi radialis
median N C6,7 O: medial epi (common flex tend) I:palmar base of MC 2&3 (index, middle) A:flexion of radial side of wrist; rad dev @ midcarpal jt; elbow flex anteromedial compartment
palmaris longus
median N C7 O: med epi (common flex tendon) I: palmar aponeurosis, flex retinacul A: flexion of radiocarpal jt; tenses palmar aponeurosis Anteromedial compartment
Flexor Digitorum Superficialis
median N C7,8 O: med epi (common flex tendon); coronoid process;central anterior radius I: sides of middle phalanx of digits 2-5 A: flex PIP, MCP, wrist, elbow anteromedial compartment
flexor carpi ulnaris
ulnar N C8,T1
O: med epi (common flex tendon); olecranon, prox posterior ulna
I: palmar base of little finger, pisiform, hook of hamate;tendon continuous as pisohamate, pisometacarpal
A: flexion of ulnar side of wrist; uln dev @ midcarpal jt; elbow flex
anteromedial compartment
Flexor Digitorum Profundus
C8,T1 Anterior interosseous N: D2,3 ulnar N: D4,5 O: prox anterior & medial shaft of ulna; medial coronoid process;interosseous compartment I:base of distal digits 2-5 A:flexion of DIP, PIP, MCP, CMC deep anteromedial compartment
flexor pollicis longus
anterior interosseous N C8,T1
O: anterior shaft of radius; interosseous memb
I: palmar base of distal thumb
A: flexion of IP, MCP, CMC; assists in wrist flex, pronation
Deep anteromedial compartment
pronator quadratus
Anterior Interosseous N: C8,T1 O:distal anterior ulna I: distal anterior radius A:pronation at prox/distal radioulnar jt; stabilizes distal radioulnar jt Deep anteromedial compartment
Triceps
radial N C6,7,8
O:
-long head: infraglenoid tubercle
-lateral head: upper lateral/posterior humerus (prox to rad groove)
-short head: lower medial/posterior humerus (distal to rad groove)
I: posterior, superior olecranon
A: elbow extension (all three heads); GH Ext and Add (long head)
Posterior compartment
anconeus
radial N C7,8
O: posterior surface of lateral epicondyle
I: lateral aspect of olecranon and posterior prox ulna
A: extend elbow
posterior compartment
coracobrachialis
musculocutaneous N C5,6,7 lateral cord O: tip of coracoid process I: anteromedial aspect of mid humerus A: GH flex; assists in GH adduct when humerus abducted Anterior compartment of arm
Biceps brachii
Musculocutaneous N (C5,6)
O:
-long head (labrum/supraglenoid tubercle)
-short head (tip of coracoid process)
I: radial tuberosity, bicipital aponeurosis
A:elbow flex; supination; assists in GH flex; GH abd (long head when arm is externally rotated)
Anterior compartment of arm
brachialis
musculocutaneous N C5,6 O: distal half of anterior humerus I: coronoid process, ulnar tuberosity A: elbow flex Anterior compartment of arm
