An inward collapse of the nasal cavity: Perinatal consolidation of the midface and cranial base in primates.
An inward collapse of the nasal cavity: Perinatal consolidation of the midface and cranial base in primates.
Anat Rec (Hoboken). 2020 Oct 11;:
Authors: Smith TD, Ufelle A, Cray JJ, Rehorek SB, DeLeon VB
Abstract
Living primates show a complex trend in reduction of nasal cavity spaces and structures due to moderate to severe constraint on interorbital breadth. Here we describe the ontogeny of the posterior end of the primate cartilaginous nasal capsule, the thimble shaped posterior nasal cupula (PNC), which surrounds the hind end of the olfactory region. We used a histologically sectioned sample of strepsirrhine primates and two non-primates (Tupaia belangeri, Rousettus leschenaulti), and histochemical and immunohistochemical methods to study the PNC in a perinatal sample. At birth, most strepsirrhines possess only fragments of PNC, and these lack a perichondrium. Fetal specimens of several species reveal a more complete PNC, but the cartilage exhibits uneven or weak reactivity to type II collagen antibodies. Moreover, there is relatively less matrix than in the septal cartilage, resulting in clustering of chondrocytes, some of which are in direct contact with adjacent connective tissues. In one primate (Varecia spp.) and both non-primates, the PNC has a perichondrium at birth. In older, infant Varecia and Rousettus, the perichondrium of the PNC is absent, and PNC fragmentation at its posterior pole has occurred in the former. Loss of...
Source: Anatomical Record - Category: Anatomy Authors: Smith TD, Ufelle A, Cray JJ, Rehorek SB, DeLeon VB Tags: Anat Rec (Hoboken) Source Type: research