[Prenatal development of the intrinsic nerves of the muscles of the human foot].

Myelogenesis and blood supply of the intraorganic nerves have been studied in 4-6- and 7-9-month-old human fetuses. At first, the intramuscular nerves are presented as very thick fasciculi (the diameter is more than 90), thick (the diameter is from 50 up to 90) and single muddle neural fasciculi (the diameter is from 30 up to 50 mcm). The microcirculatory blood bed is formed at the expense of branches of the blood vessel-satellites and the blood vessels of the surrounding tissues and is carried out, without any interruption, along the whole extent. In 7-9-month-old fetuses the neural apparatus becomes more complex. The number of the middle neural fasciculi appear. On the background of fine neural fibers in the fasciculi a small part of the middle neural fibers appears, and in the musculus flexor digitorum brevis--single thick neural fibers. The intramuscular nerves have their own hemocirculatory bed presented by microvessels that are on the perineurium surface, in its bulck and among neural fibers.