The primate umbilical cord with special reference to the transverse communicating artery
1972; Elsevier BV; Volume: 1; Issue: 4 Linguagem: Inglês
10.1016/0047-2484(72)90111-x
ISSN1095-8606
Autores Tópico(s)Genetic Syndromes and Imprinting
ResumoThe cords of 185 non-human primate placentae and foetuses, representing all the families (except Indriidae, Daubentoniidae, Tarsiidae, Callimiconidae and Hylobatidae) are described in respect of the cord structures present and their relation to each other and the foetal surface of the placenta. (1) In particular, the form and incidence of the transverse communicating artery, as found in this series, are described. It was not found in any Strepsirrhine—placentae of this group are diffuse, epithelio—chorial—but attention is drawn to its occurrence in some non-primate Mammals with this kind of placenta. It was found in 14 of 45 (31%) New World (Platyrrhine) Primates and in 93 of 116 (80·1%) Old World (Catarrhine) Primates. (2) One case of a single umbilical artery in a Papio anubis is recorded—the second in the literature. (3) It is not possible to define the role of this interarterial channel though it almost certainly must have some equalizing effect on the distribution and arterial pressure of the foetal placental blood. There is as yet no explanation as to what compensates for its total absence nor as to what conduces to its lower incidence in the later foetal stages of some genera.
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