HAND Flashcards
Palmaris brevis
superficial muscle, goes across palm towards thumb
I
name the three thenar muscles
all 3 are brevis
- abductor pollicis brevis (lateral)
- flexor pollicus brevis (medial)
- oppenens pollicis (deep to 1 & 2)
abductor pollicis brevis
O: 1. tubercles of scaphoid and trapezium
2. flexor retinaculum
I: Lateral side of proximal phalanx of thumb. Tendon contains a sesamoid bone (bone within a tendon)
A; abducts thumb
flexor pollicis brevis
AFO
O: 1.. tubercle of trapezium
2. flexor retinaculum
I: lateral side of proximal phalanx of thumb. tendon may contain a sesamoid bone in common with abductor pollicis brevis
A: flexes thumb
Opponens Pollicis
little deep guy
O: Tubercle of trapezium & flexor reticulum
I: lateral side of metacarpal 1
A: opposition of thumb
adductor pollicis
*NOT in thenar eminence
O: 1. origin of oblique head: bases of metacarpals 2 & 3
- origin of transverse head; shaft of metacarpal 3
I: base of proximal phalanx of thumb (tendon contains a sesamoid bone)
A: adducts thumb
3 hyporthenar muscles to little finger:
mirror image of thenar muscles
- all digiti minimi
1. abductor digiti minimi
2. flexor digiti minimi
3. opponens digiti minimi
abductor digiti minimi
ulnar one
O: pisiform bone
I: medial side of proximal phalanx of digit 5
A: abducts little finger
flexor digiti minimi
2nd in from ADM
O: hook of hamate and flexor retinaculum
I: medial side of proximal phalanx of digit 5
A: flexion of little finger
opponens digiti minimi
deep of 1& 2
O: hook of hate and flexor retinaculum
I: metacarpal 5
A: Laterally rotates metacarpal 5 to oppose little finger with thumb
Lumbricals
have bipenate lumbricals 3 & 4
&
unipennate lumbricals 1 & 2
O: tendons of flexor digitorum profundus
I; lateral sides of extensor expansions of digits 2-5
A: flexion of MP joint & extension of PIP and DIP joints
interosseous
DAB
- these are between metacarpals where lumbricals are around digits
O: Adjacent sides of metacarpals at interosseous spaces
I:
- Extensor expansions of digits 2, 3,4 (not 1 & 5)
- proximal phalanges of digits 2, 3, 4 ( not 1 & 5)
A: 1. abduction away from axis through middle finger
- flexion of MP and extension of PIP and DIP joints (like lumbricals)
Palmar interosseous (unipennate muscles)
PAD
O: Metacarpals 1,2,4, 5 (no 3)
I: 1. proximal phalanges of all digits (except digit 3)
- extensor expansions of all digits (except 3)
A: 1. flexion of MP JOINt
2. extension of PIP and DIP joints (just like lumbricals)
- adduction of fingers to plane through middle finger
What phalanx has the bipennate lumbricals?
3 & 4
these are unique because they originate on the tendon of another muscle
What phalanx has the unipennate lumbricles
1 & 2 these are unique because they originate on the tendon of another muscle
Actions of lumbricals
- flexion of MP joint
2. extension of PIP & DIP
4 dorsal interosseous
originate: adjacent sides of metacarpals at interosseous spaces
inserts: not 1 & 5 but 2,3,4 extensor expansion & 2,3,4 of proximal phalanges
interosseous means
between bones
superficial palmar arch
& there is a deep palmer arch
arch along metacarpals
medial 3.5 is ulnar
lateral 1.5 is radial
deep palmer arch is a the base
name proximal to distal on ulnar artery 3.5
1st palmar digital artery that’s it if it doesn’t branch
if it branches we have the common palmar digital artery
into proper palmer digital arteries
name proximal to distal on radial 1.5
1st palmar branch of radial artery
if thumb then princeps pollicis
if index then radials indicis
arteries at dorsum of hand
proximal to distal
radial artery in snuffbox
radial artery penetrating 1st dorsal interosseous to enter palm of hand (first branch)
Dorsal Carpal arch goes toward pinky, branches fto dorsal metacarpal arteries & then dorsal digital arteries.
dorsal digital artery toward thumb
superficcial palmar arch
same spot as proximal transverse crease (gypsy crease)
deep palmar arch
halfway between distal & proximal transverse crease
