Browsing by Author "Leyton, Victor"
Now showing 1 - 2 of 2
Results Per Page
Sort Options
Item Descripción Histológica de los Diferentes Segmentos del Aparato Respiratorio de Avestruz (Struthio camelus var. Domesticus)(Sociedad Chilena de Anatomia, 2014) Illanes, Julio; Leitchle, Jorge; Leyton, Victor; Tapia, Luis; Fertilio, Bárbara; Castro, MarioDue to the growing interest of the ostrich industry (Struthio camelus var. domesticus) and the scarce bibliographic material related to morphology of the respiratory system of the ostrich, we carried out a comparative analysis of the laryngotracheal pulmonary segment of this bird. The research was conducted in six clinically healthy ostriches from which representative samples of the laryngotracheal pulmonary segment were obtained. Samples were processed using standard histological technique and a comparative morphological analysis between ostriches and chicken (Gallus gallus) was performed. In the ostrich, the arytenoid cartilage is double and placed in a dorsal and cranial position in relation to the larynx while the cricoid cartilage is single and situated in a ventral and caudal position. Like the chicken, the procricoid cartilage is also present. The trachea exhibits a greater number of rings compared to the chicken. At the syrinx level, the pessulus is made up of a dorso-ventral double-fold of mucous membrane with a lamina propria of dense connective tissue over a thick adipose layer. Unlike the chicken the ostrich pessulus does not contain any ossified or cartilaginous tissues. The mucosa between the larynx and secondary bronchi has a pseudostratified prismatic ciliated epithelium with mucous goblet cells with crypts and simple tubuloalveolar mucosal glands for mucous secretion. In the extrapulmonary primary bronchi this histological feature is observed only in the medial aspect where the ends of the cartilaginous rings are found. The remaining mucosa of these bronchi has a pseudostratified prismatic ciliated epithelium with mucous goblet cells. Aerial sacs show this histological feature in some sectors.Item Oviducal glands throughout the gonad development stages: a case study of Octopus mimus (Cephalopoda)(Taylor & Francis Online, 2017) Olivares, Alberto; Avila, Omar; Leyton, Victor; Zuñiga, Oscar; Rosas, Carlos; Northland, IrmaThe oviducal glands (ODG) play a crucial role in octopus reproduction. Herein, structural changes of each section of the ODG of Octopus mimus are described histologically throughout the gonad development stages (GDS). To do this, the epithelial height, stereociliated or non-stereociliated epithelium, nucleus type (pycnotic or non-pycnotic), epithelial secretions and the value range of the macroscopic maturity index (MaMI), which directly involves ODG status, were measured. The ODG are internally constituted of two glandular units (central and peripheral glands) and one set of receptacles (the spermathecae). High epithelia (40 to 80 μm) were observed in both gland units during periods with low MaMI values (< 0.1) corresponding to III-mature and IV-pre-spawning. The stereociliated epithelium was only apparent in II-maturing and III-mature in both gland units. The nuclei were noticeably pycnotic in the central gland during III-mature, IV-pre-spawning and Vspawning, but pycnotic in the peripheral gland only during VI-depletion. The epithelium was disorganised during VI-depletion, while sulphated acid mucin was only present during III-mature in the central gland. The epithelium transformations during the GDS are related to the functions of the gland units and to their multiple secretions. The ODG histology complements the GDS and provides better reproductive status assessment.