Intrinsics Flashcards
Riche cannieu anastomosis
Median/ulnar connection at the level of the Palm
First dorsal interosseous, third and fourth limb rivals and adductor policis may have dual innervation
Sagittal band origin and insertion
Edge of edc tendons volar to the volar plate
Results in mp ext with wrist extension by tightening of the volar plate
Most superficial hypothenar muscle
Adq
Pisiform
To lat tubercle of p1 and dorsal hood
The workhorse of the extensor apparatus
Lumbricals
Active during ip extension regardless of mp position
Lumbricals o i
Tendons of fdp
Radial lateral band of each finger
Contributes little to mp flex ion unless the interossei are paralysed
Insertion of central slip
Middle phalanx base
Purpose of triangular ligament
Prevent volar subluxation of lateral bands at dip joint
Purpose if transverse retinacular ligament
Prevents dorsal subluxation of conjoined lateral bands
O I of orl
Purpose of orl - oblique retinacular ligament
Flexor pulley adjacent to p1
To terminal tendon
Link ligament
Landsmeer ligament
Tenodesis- to get dip ext when pip ext
What is always inadequate in boutonnière deformity
The central slip insertion
Secondarily the triangular ligament allows volar subluxation of the lateral bands at pip joint and they begin to extend the dip and flex the pip further
Martin Gruber anastomoses
%
Most common result
Median innervation of ulnar muscles, level of forearm
17% of population
Connections involve motor branches of the median nerve to the ulnar nerve to innervate “median muscles”
Duchennes sign
Clawing of ring and small fingers
Thomas sign
Patient subconsciously flexes wrist to gain more power in extensors
Bouviers test
Patients pip joints extend when mp joints are held in flexion- indicates intact extensor apparatus
