ABSTRACT
PERIONYCHIUM n Nail complex n Constitutes dorsum of fingertip n Begins approximately 1.2 mm distal to extensor tendon insertion n See Chapter 57 for anatomic details. n Fingertip injuries: May involve nail plate, nail bed, hyponychium, eponychium, and paronychium
SKIN n Glabrous n Thick epidermis with deep papillary ridges that create fingerprints
PULP n Fibrofatty tissue n Rich vasculature n Stabilized by fibrous septa that extend from dermis to periosteum of distal phalanx n Stabilized laterally to distal phalanx by extensions from Cleland’s and Grayson’s ligaments n Distal pulp: Multipyramidal structure of fibroadipose tissue compartments n Proximal pulp: Two layers of spherical tissue compartments n Volar pulp: 56% of fingertip volume1
Fig. 67-1 Lateral view of fingertip.
