Hand Flashcards
Learn attachments, actions, innervations
Flexor Pollicus Brevis
Attachments, Action, Innervation
Flexor Retinaculum, Tubercle of Trapezium + Trapezoid
Lateral Aspect Base 1st Proximal Phalanx
Action: Flexion of Thumb
Nerve Supply: Median Nerve (C8, T1)
Abductor Pollicus Brevis
Attachments, Action, Innervation
Flexor Retinaculum, Tublercles of Trapezium & Scaphoid
Lateral Aspect Base of 1st Proximal Phalanx
Action: Abduct 1st Digit, Assist in Opposition by Rotating 1st Digit Medially
Nerve Supply: Median Nerve (C8, T1)
Opponens Pollicus
Attachments, Action, Innervation
Flexor Retinaculum, Tublercles of Trapezium & Scaphoid
Lateral Surface 1st Metacarpal
Action: Opposes 1st Metacarpal, (Draws & Rotates Medially)
Nerve Supply: Median Nerve (C8, T1)
Adductor Pollicus
Attachments, Action, Innervation
(2 Heads)
Oblique Head: Capitate, Bases of Metacarpals 2,3
Transverse Head: Ant. Shaft 3rd Metacarpal
Medial Aspect Base 1st Proximal Phalanx
Action: Adduct 1st Digit
Nerve Supply: Deep Branch Ulnar Nerve (C8, T1)
Palmaris Brevis
Attachments, Action, Innervation
Flexor Retinaculum + Medial Border Palmar Aponeurosis
Dermis of Medial Border of Hand
Action: Deepen Groove Medial Aspect of Hypothenar Eminence, Wrinkles Skin, Accentuates Eminence, May Contribute to Grip
Nerve Supply: Superficial Branch of Ulnar Nerve (C8, T1)
Flexor Digiti Minimi Brevis
Attachments, Action, Innervation
Hook of Hamate + Flexor Retinaculum
Medial Aspect Base 5th Proximal Phalanx
Action: Flexion 5th Proximal Phalanx
Nerve Supply: Deep Branch of Ulnar Nerve (C8, T1)
Abductor Digiti Minimi
Attachments, Action, Innervation
Pisiform
Medial Aspect Base 5th Proximal Phalanx
Action: Abducts 5th Digit
Nerve Supply: Deep Branch of Ulnar Nerve (C8, T1)
Opponens Digiti Minimi
Attachments, Action, Innervation
Hook of Hamate + Flexor Retinaculum
Medial Border 5th Metacarpal
Action: Opposes 5th Metacarpal (Flex + Laterally Rotates)
Nerve Supply: Deep Branch of Ulnar Nerve (C8, T1)
Lumbricals
Attachments, Action, Innervation
Tendons of Flexor Digitorum Profundus
Lateral Aspect Extensor Expansion Digits 2-5
Action: Flexion of Metacarpophalangeal Jts. Digits 2-5
& Extension of Interphalageal Jts. Digits 2-5
Nerve Supply: 1,2: Median Nerve (C8, T1)
3,4: Deep Branch Ulnar Nerve (C8, T1)
Palmar Interosseous
Attachments, Action, Innervation
1: Medial Aspect 2nd Metacarpal, 2: Lateral Aspect 4th Metacarpal,
3: Lateral Aspect 5th Metacarpal
Bases Proximal Phalanx + Extensor Expansion of Digit 2,4,5 (Same Aspect as Origin)
Action: Adducts Digits 2,4,5 Respectively, Assist in Flex. Metacarpophalangeal Jts. + Extension Interphalangeal Jts.
Nerve Supply: Deep Branch Ulnar Nerve (C8, T1)
Dorsal Interosseous
Attachments, Action, Innervation
Adjactent Sides of Metacarpals (Bipennate) 1: 1+2, 2: 2+3, 3: 3+4, 4: 4+5
Base of Proximal Phalanges 2-4 & Extensor Expansion Digits 2-4
Action: Abducts Digits 2,3,4 Assist in: Flex. Metacarpophalangeal jts. & Extension at Interphalangeal Jts.
Nerve Supply: Deep Branch of Ulnar Nerve (C8, T1)
Carpometacarpal Joint
Type, Action, Extra Info
Type: Plane Synovial
Action: Flexion + Extension
Extro Info: 1st Carpometacarpal Jt. (Thumb) = Saddle Jt. Which also Permits Abduction, Adduction & 2/3 of Opposition
Intermetacarpal Joint
Type, Action, Extra Info
Type: Plane Synovial
Action: Flexion + Extension
Extra Info: 1/3 Opposition occurs at 4th, 5th Intermetacarpal & Carpometacarpal jts.
Metacarpophalangeal Joint
Type, Action, Extra Info
Type: Condyloid Synovial
Action: Flexion, Extension + Circumduction Digits 2-5
Extra Info: Palmar Plates (Ligaments) & Collateral Ligaments Support Jts.
Deep Transverse Lig. Joins Metacarpophalangeal Jts. 2-5
Interphalangeal Joint
Type, Action, Extra Info
Type: Synovial Hinge
Action: Flexion + Extension
Extra Info: 1st Digit Only Has 1 Interphalangeal Jt. > Digits 2-5 Also Have Proximal + Distal Interphalangeal Jts.
º of Flexion Increased Medially (Digit 5 Permits Most Flexion) & Palmar Plates: Increase Congruence, Resist Hyperextension/ Compressive Forces
