Vestibular system of the newborn marsupial cat Dasyurus hallucatus

Gemmell, R. T.; Nelson, Jacob L.

doi:10.1002/ar.1092250305

Cited by 19 publications

(16 citation statements)

References 17 publications

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“…Likewise, a saccule was not observed in any of the stages examined. Similar observations have been reported in the newborn of D. hallucatus, a carnivorous Australian mar supial [Gemmell and Nelson, 1989]. In both species, Dasyunis and Didelphis, only one sensory region could be identified, the macula of the utricle.…”

Section: Discussionsupporting

confidence: 67%

The Vestibular Apparatus of the Opossum (Didelphis virginiana) prior to and Immediately after Birth

Wj¹

1991

Cells Tissues Organs

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The vestibular apparatus of the opossum was examined shortly before and immediately after birth. A band of about 20 sensory cells was observed within the forming utricle by 24 h prior to birth. Stereocilia projecting from the apices of the sensory cells appeared intimately associated with a well-defined population of overlying otoliths. These morphological observations suggest that a functional utricle may be present at the time of birth and together with other senses (tactile, olfaction) may aid the newborn of this species in its migration from the birth canal to the pouch.

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Section: Discussionsupporting

confidence: 67%

The Vestibular Apparatus of the Opossum (Didelphis virginiana) prior to and Immediately after Birth

Wj¹

1991

Cells Tissues Organs

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“…It has been suggested that vestibular guidance is involved (Cannon, Bakker, Bradshaw, McDonald, & McDonald, 1976). Indeed, the utriculus component of the vestibular apparatus, but not the sacculus or semicircular canals, has all the structural elements necessary for functioning (Gemmell & Nelson, 1989). The trigeminal sys-tem has some sensorimotor and olfactory functioning at birth (Hughes & Hall, 1988;Nelson, 1988), and may also be involved in guiding the neonate on its trek to the pouch.…”

Section: Order Of Appearance Of Righting Systemsmentioning

confidence: 99%

The development of righting reflexes in the pouch young of the marsupial Dasyurus hallucatus

Pellis

Nelson

1992

Developmental Psychobiology

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The development of righting was studied in the young of Dasyurus hallucatus, a small marsupial from northern Australia. Young were tested from birth to weaning. Righting began at 40 days, when tactile input on the snout triggered rotation to prone. Over the next 15-20 days, asymmetrical tactile input on the body triggered righting movements by the hindlegs (and later by the forelegs). Vestibular righting reflexes developed after these tactile righting reflexes. Furthermore, asymmetrical vestibular righting (i.e., when the young are held laterally in the air) developed before symmetrical vestibular righting (i.e., when held downward by the pelvis or placed supine in water). Vestibular righting triggered by falling supine in the air did not develop until about 80 days. This study further demonstrates that righting behavior does not consist of a single, integrated motor pattern, but a suite of motor patterns having independent control mechanisms and patterns of development.

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“…The otocyst, as has been described in Gemmell and Nelson (1989), is similar to stage 15 eutherian embryos where the cochlea and vestibular regions are apparent, where the endolymphatic appendage is a diverticulum of the vestibular region and where there is an indication of the formation of one of the semicircular canals from the vestibulary region. The vomeronasal organ has begun to develop but nerves have not yet reached the brain.…”

Section: Internal Featuresmentioning

confidence: 56%

“…Even though there are olfactory receptors (Gemmell and Nelson 1988c) there is no organisation within the telencephalon or diencephalon to enable a connection to a motor centre. The newborn thus depends on the trigeminal, facial, vestibular [see Gemmell and Nelson 1989], glossopharyngeal, vagus, accessory and hypoglossal but not auditory. Thus the only senses that the newborn can use are touch, thermal, balance and chemical (via trigeminal).…”

Section: Discussionmentioning

confidence: 99%

Developmental staging in a marsupial Dasyurus hallucatus

Nelson

1992

Anat Embryol

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In a marsupial, Dasyurus hallucatus, pouch-young of various ages from newborn to 55 days were embedded in wax and serially sectioned. On the basis of the relative development of external and internal characteristics, they were placed in the Carnegie staging system developed by Streeter and elaborated by O'Rahilly and associates. Birth occurred at stage 15, and the end of embryogenesis (stage 23) was reached about day 33. Whereas stage 23 is characterised in all eutherians by the closure of the secondary palate, this occurs before stage 15 in D. hallucatus. Since most other characters of the newborn are at a stage 15 level of development, there has been a relative acceleration of development of the secondary palate (and forelimb) in D. hallucatus that allows it to suckle and breathe at the same time. Between D. hallucatus and eutherians, there is general agreement in the sequence of development and in the relative degree of most structures at each stage. Further marsupials should be examined to see if the minor differences noted are peculiar to D. hallucatus or apply to marsupials generally.

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Vestibular system of the newborn marsupial cat Dasyurus hallucatus

Cited by 19 publications

References 17 publications

The Vestibular Apparatus of the Opossum (<i>Didelphis virginiana</i>) prior to and Immediately after Birth

The Vestibular Apparatus of the Opossum (<i>Didelphis virginiana</i>) prior to and Immediately after Birth

The development of righting reflexes in the pouch young of the marsupial Dasyurus hallucatus

Developmental staging in a marsupial Dasyurus hallucatus

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