Abstract：
:Astyanax brucutu is a peculiar species of Neotropical tetra endemic from the Chapada Diamantina, a large plateau in northeastern Brazil. Individuals of this species undergo a dramatic ontogenetic shift in their diet that is accompanied by equally remarkable changes in their feeding apparatus. Whereas juveniles of A. brucutu feed mostly on algae, adults feed almost exclusively on an endemic species of hydrobiid snail and other associated living organisms that inhabit their dead shells (including infaunal invertebrates and algae). Skeletal adaptations associated with this change in diet were previously reported, but until now, the changes in the musculature remained mostly unknown. The present paper describes the facial and gular muscles, as well as the buccal ligaments of A. brucutu in different life stages, and identifies the major ontogenetic changes in these systems associated with the diet shift in the species. Such changes primarily involve expansions of specific portions of the adductor mandibulae and associated tendons and ligaments that likely represent adaptations to increase the biting power necessary to crush copious amounts of shells ingested by larger individuals of A. brucutu. Those adaptations are absent in specimens of any size of Astyanax cf. fasciatus, a sympatric congener lacking durophagous feeding habits. Anatomical comparisons and landmark-based principal components analysis (PCA) suggest that most specializations to durophagy in A. brucutu arose by peramorphosis. We also found that several of the muscular specializations of adults of A. brucutu are paralleled in species of Creagrutus and Piabina, two other characid genera distantly related to Astyanax, but that also feed on hard food items.
journal_name
J Anatjournal_title
Journal of anatomyauthors
Vita G,Zanata AM,Datovo Adoi
10.1111/joa.13280subject
Has Abstractpub_date
2020-12-01 00:00:00pages
1136-1150issue
6eissn
0021-8782issn
1469-7580journal_volume
237pub_type
杂志文章abstract：:The pituitary of roach, Rutilus rutilus (L.), is pear-shaped and situated in the sella turcica. It is characterised by a large pars nervosa, which penetrates deep into the other regions, splitting the proximal pars distalis. Spatial localisation of nerve fibre types and glandular cell types occurs. Using a variety of ...
journal_title：Journal of anatomy
pub_type： 杂志文章
doi：
更新日期：1980-06-01 00:00:00
abstract：:The proximal pelvic limb musculature of the Eastern Grey Kangaroo, Macropus giganteus (Zimm) is described with nine illustrations. The text is based on dissections of 44 Grey Kangaroos ranging in empty body weight from 791 g to 58 kg. ...
journal_title：Journal of anatomy
pub_type： 杂志文章
doi：
更新日期：1976-04-01 00:00:00
abstract：:During ageing, a progressive loss of skeletal muscle mass and a decrease in muscle strength and endurance take place, in the condition termed sarcopenia. The mechanisms of sarcopenia are complex and still unclear; however, it is known that muscle atrophy is associated with a decline in the number and/or efficiency of ...
journal_title：Journal of anatomy
pub_type： 杂志文章
doi：10.1111/joa.12429
更新日期：2016-05-01 00:00:00
abstract：:The structure of amniotic papillae in sheep was investigated by light transmission and scanning electron microscopy. Papillae were found on the amnion near the umbilical cord in a majority of the sheep examined, from early mid-term onwards. The papillae possessed a basic connective tissue core with a varying degree of...
journal_title：Journal of anatomy
pub_type： 杂志文章
doi：
更新日期：1978-06-01 00:00:00
abstract：:The absolute number of parvicellular and magnocellular neurons in the red nucleus was estimated using design-based stereological counting methods and systematic random sampling techniques. Six young adult male rats, and a complete set of serial 40-μm glycolmethacrylate sections for each rat, were used to quantify neur...
journal_title：Journal of anatomy
pub_type： 杂志文章
doi：10.1111/joa.12495
更新日期：2016-09-01 00:00:00
abstract：:We report a magnetic resonance imaging study which developed a consistent hierarchy of imaging planes for examination of the origins, courses and principal branches of the main coronary arteries of prepared human cadaveric hearts. The reference longitudinal axis was chosen between the aortic valve and the apex of the ...
journal_title：Journal of anatomy
pub_type： 杂志文章
doi：
更新日期：1994-10-01 00:00:00
abstract：:The histochemical and ultrastructural characteristics of the adult rat and rabbit costal diaphragm were investigated. On the basis of enzyme histochemistry, the rat diaphragm was found to contain 42% and 39% Type I, 24% and 25% Type II A and 33% and 34% Type II B fibres on the thoracic and abdominal surfaces respectiv...
journal_title：Journal of anatomy
pub_type： 杂志文章
doi：
更新日期：1990-02-01 00:00:00
abstract：:The subglottic region of the larynx is of high clinical relevance with regard to infections and malignancies. Little is known about the distribution of mucins and antimicrobial substances in this area. In this study, we have investigated the mucin distribution in the normal subglottis of the larynx. Moreover, we analy...
journal_title：Journal of anatomy
pub_type： 杂志文章
doi：10.1111/j.1469-7580.2008.00960.x
更新日期：2008-10-01 00:00:00
abstract：:The testicular capsule was studied histologically, morphometrically, ultrastructurally and immunohistochemically in the Japanese quail, domestic fowl, turkey and duck (all members of the Galloanserae). The testicular capsule was, relative to mammals, thin, being 81.5 +/- 13.7 microm in the quail, 91.7 +/- 6.2 microm i...
journal_title：Journal of anatomy
pub_type： 杂志文章
doi：10.1111/j.1469-7580.2007.00726.x
更新日期：2007-06-01 00:00:00
abstract：:The lacrimal sac and nasolacrimal duct are surrounded by a wide cavernous system of veins and arteries comparable to a cavernous body. The present study aimed to demonstrate the ultrastructure of the nervous tissue and the localisation of neuropeptides involved in the innervation of the cavernous body, a topic not pre...
journal_title：Journal of anatomy
pub_type： 杂志文章
doi：10.1046/j.1469-7580.2000.19720177.x
更新日期：2000-08-01 00:00:00
abstract：:The regeneration of adrenocortical autotransplants in the rat spleen has been investigated by light and electron microscopy. Up to the seventh day after implantation, adrenal grafts showed large areas of necrosis and contained many degenerating (apoptotic) adrenocortical cells, some mesenchyme-like poorly differentiat...
journal_title：Journal of anatomy
pub_type： 杂志文章
doi：
更新日期：1982-09-01 00:00:00
abstract：:The 2D arrangement of rows of enamel rods with alternating (decussating) tilt angles across the thickness of the inner layer in rat and mouse incisor enamel is well known and assumed to occur in a uniform and repetitive pattern. Some irregularities in the arrangement of rows have been reported, but no detailed investi...
journal_title：Journal of anatomy
pub_type： 杂志文章
doi：10.1111/joa.13053
更新日期：2019-11-01 00:00:00
abstract：:Homoplastic grafts of re-orientated unsegmented paraxial mesoderm transplanted from stage 20 Xenopus embryos into host embryos of the same age resulted in segmentation and the formation of somites in the same axis as if they had been left in situ. Because grafts transplanted with various orientations came under the st...
journal_title：Journal of anatomy
pub_type： 杂志文章
doi：
更新日期：1983-06-01 00:00:00
abstract：:Forelimb reduction occurred independently in multiple lineages of theropod dinosaurs. Although tyrannosaurs are renowned for their tiny, two-fingered forelimbs, the degree of their reduction in length is surpassed by abelisaurids, which possess an unusual morphology distinct from that of other theropods. The forelimbs...
journal_title：Journal of anatomy
pub_type： 杂志文章
doi：10.1111/joa.12660
更新日期：2017-10-01 00:00:00
abstract：:On the basis of its internal structure, the ball of the foot can be divided into three transverse areas, each with a different mechanical function: (1) an area proximal to the heads of the metatarsals in which the retinacula cutis are developed into a series of transverse bands, and in which the deep fibres of the pla...
journal_title：Journal of anatomy
pub_type： 杂志文章
doi：
更新日期：1976-07-01 00:00:00
abstract：:This study examined NADPH-d and nNOS expression in the SCG of hamsters. By light microscopy, numerous NADPH-d/NOS positive processes were widely distributed in the ganglion. Ultrastructurally, the NADPH-d reaction product was associated with the membranous organelles of neuronal soma, dendrites, myelinated fibres, sma...
journal_title：Journal of anatomy
pub_type： 杂志文章
doi：10.1046/j.1469-7580.2000.19730461.x
更新日期：2000-10-01 00:00:00
abstract：:Cellullar deficits are replenished within the central nervous system (CNS) by progenitors to maintain integrity and recover function after injury. NG2 proteoglycan-expressing progenitors replenish oligodendrocyte populations, but the nature of NG2 proteoglycan may not indicate a restricted population of progenitors. A...
journal_title：Journal of anatomy
pub_type： 杂志文章,评审
doi：10.1111/j.1469-7580.2005.00480.x
更新日期：2005-12-01 00:00:00
abstract：:Mastoid canals (tunnels) were observed in 41 (7.7%) of 265 dry human skulls. The canals were 2-27 mm long. This feature has not been reported before. dissection of 30 mastoid regions in cadavers showed that the canals contained a branch of the occipital artery and a vein. It is possible that during development of the ...
journal_title：Journal of anatomy
pub_type： 杂志文章
doi：
更新日期：1996-02-01 00:00:00
abstract：:The present paper reports the results of the first investigation of the semicircular canals in a living, small animal by means of high spatial resolution magnetic resonance imaging. This procedure is noninvasive and allows identification of the endolymphatic and perilymphatic spaces yielding a morphology quite consist...
journal_title：Journal of anatomy
pub_type： 杂志文章
doi：
更新日期：1992-04-01 00:00:00
abstract：:The cellular changes in the ileum and duodenum and in the mesenteric and prefemoral lymph nodes of gnotobiotic piglets were observed following feeding with a live culture of a non-pathogenic E. coli. There was a rapid and intense reaction in the lower ileum, and follicles were formed; germinal centres were formed in t...
journal_title：Journal of anatomy
pub_type： 杂志文章
doi：
更新日期：1977-12-01 00:00:00
abstract：:The labelling of amoeboid microglial cells in the postnatal (2-10 days old) rat brain was studied by intracerebral injection of various lectins, including peroxidase-labelled Ricinus communis agglutinin (RCA), peroxidase-labelled isolectin Griffonia simplicifolia (GSA1-B4) and gold-labelled concanavalin A (Con A). Thr...
journal_title：Journal of anatomy
pub_type： 杂志文章
doi：
更新日期：1990-12-01 00:00:00
abstract：:The number of large neurons in the lateral vestibular nucleus of the mouse brain decreases in number after 25 months of age, from 488 at 25 months to 298 at 31 months. The number of small neurons in the nucleus remains constant up to 31 months of age. Large neurons accumulate lipofuscin from 25 months and their mean n...
journal_title：Journal of anatomy
pub_type： 杂志文章
doi：
更新日期：1989-10-01 00:00:00
abstract：:Apart from molecular data, nearly all the evidence used to study primate relationships comes from hard tissues. Here, we provide details of the first parsimony and Bayesian cladistic analyses of the order Primates based exclusively on muscle data. The most parsimonious tree obtained from the cladistic analysis of 166 ...
journal_title：Journal of anatomy
pub_type： 杂志文章
doi：10.1111/j.1469-7580.2011.01403.x
更新日期：2011-09-01 00:00:00
abstract：:Four forelimbs of 3 platypuses and 3 forelimbs of 2 echidnas were examined to study the precise form of the brachial plexus and to clarify the structural characteristics of the brachial plexus in phylogeny. The spinal components contributing to the plexus (C4-T2) and the formation patterns of the 3 trunks of the plexu...
journal_title：Journal of anatomy
pub_type： 杂志文章
doi：10.1046/j.1469-7580.1997.19030447.x
更新日期：1997-04-01 00:00:00
abstract：:The angularis oris gland, an avian salivary gland that lies beneath the zygomatic arch, was studied in the house sparrow by means of light and electron microscopy. The gland consists of lobules composed of epithelial tubules and folds on a delicate connective tissue framework. The lobules are drained by large channels...
journal_title：Journal of anatomy
pub_type： 杂志文章
doi：
更新日期：1986-04-01 00:00:00
abstract：:One of the great ongoing debates in palaeo-anthropology is when, and how, hominids acquired habitual bipedal locomotion. The newly adopted bipedal gait and the ancestral quadrupedal gait are most often considered as very distinct, with each habitual locomotor mode showing corresponding anatomical adaptations. Bonobos ...
journal_title：Journal of anatomy
pub_type： 杂志文章,评审
doi：10.1111/j.0021-8782.2004.00292.x
更新日期：2004-05-01 00:00:00
abstract：:Arguably, the gold standard of biological repair of articular cartilage lesions is autologous chondrocyte transplantation. Although the clinical outcomes appear to range between good and excellent in most cases, there are, nevertheless, both clinical and biological challenges that remain to improve rehabilitation and ...
journal_title：Journal of anatomy
pub_type： 杂志文章,评审
doi：10.1111/j.1469-7580.2006.00624.x
更新日期：2006-10-01 00:00:00
abstract：:The articular facets of the sustentaculum tali have a variety of configurations that are generally viewed as nonmetric traits of little functional significance. Bruckner (1987), in contrast, has hypothesised that sustentaculum tali facet variations are functionally important because they influence subtalar joint stabi...
journal_title：Journal of anatomy
pub_type： 杂志文章
doi：
更新日期：1993-12-01 00:00:00
abstract：:Keratinocytes, in response to irritants, secrete pro-inflammatory mediators which recruit and activate immune and mesenchymal cells, including fibroblasts, to repair the skin. Fibroblasts respond by synthesising collagen and promoting the crosslinking extracellular matrix (ECM). We recently showed that the deletion of...
journal_title：Journal of anatomy
pub_type： 杂志文章
doi：10.1111/joa.12442
更新日期：2016-05-01 00:00:00
abstract：:This study was carried out on 208 Nigerian bony palates in dried skulls and on 30 palates obtained from Nigerian cadavers. Out of 208 dried skulls examined, there was a unilateral spine in 21.1% of cases, a bilateral spine in 36.5% and a bony canal in 5.7%. Of the dissected palates 30% revealed the presence of an osse...
journal_title：Journal of anatomy
pub_type： 杂志文章
doi：
更新日期：1988-02-01 00:00:00
