S. Godynicki et al., NUTRITIONAL AND FUNCTIONAL BLOOD-VESSELS OF ANAGEN AND TELOGEN VIBRISSAL FOLLICLES IN THE CAT, Acta anatomica, 160(2), 1997, pp. 83-87
The nutritional blood vessel system in the anagen (growing) vibrissal
follicle consists of a rete capillare papillae pill, rete capillare bu
lbi pill, rete capillare folliculi pili, and rete capillare canalis pi
ll. Due to degeneration of papilla and bulb during the sinus hair cycl
e, the basal capillary networks are absent in the telogen (resting) vi
brissal follicle. Thus, nonpermanent and permanent capillary networks
have to be distinguished. A functional blood vessel system originates
from arterioles that enter the sinus cavernosus at its basolateral sid
e. Blood flow continues into the sinus anularis, Efferent capillaries,
originating from the apical-axial area of the sinus anularis, build u
p a separate network for the collection of blood from the sinuses. The
se capillaries continue towards the dermis, contribute to the nutritio
nal vascularization of the sebaceous gland, and finally connect with t
he subepidermal capillary loops.