1. In order to establish the subunit composition of neuronal nicotinic receptors in rat superior cervical ganglia (SCG), their single-channel properties were compared with those of recombinant receptors expressed in Xenopus oocytes, using outside-out excised patch recording. 2. The mean main conductance of SCG channels from adult and 1-day-old rats was 34.8 and 36.6 pS, respectively. Less frequ...

Establishing topographical maps of the external world is an important but still poorly understood feature of the vertebrate sensory system. To study the selective innervation of hindbrain regions by sensory afferents in the zebrafish embryo, we mapped the fine-grained topographical representation of sensory projections at the central level by specific photoconversion of sensory neurons. Sensory...

Neurons of cranial sensory ganglia are derived from the neural crest and ectodermal placodes, but the mechanisms that control the relative contributions of each are not understood. Crest cells of the second branchial arch generate few facial ganglion neurons and no vestibuloacoustic ganglion neurons, but crest cells in other branchial arches generate many sensory neurons. Here we report that th...

Verhofstad et al. (Verhofstad, A. A. J., H. W. M. Steinbusch, B. Penke J. Varga, and H. W. J. Joosten (1981) Brain Res. 212: 39-49) have reported that serotonin of the rat superior cervical ganglion is contained in a distinct and separate population of small intensely fluorescent (SIF) cells. We provide evidence that the serotonin-containing SIF cells are modulated, in part, by preganglionic ch...

CT of a patient with conductive hearing loss showed a small vascular structure leaving the carotid canal and passing through the stapes to join the facial nerve canal. The small bony channel paralleled the anterior tympanic segment of the facial nerve, continuing beyond the geniculate ganglion into the middle cranial fossa. Otoendoscopic photography documented the presence of a persistent stape...

It is well known that catecholamines significantly modify the sympathetic ganglionic transmission (1-10). Since Eccles and Libet (7) proposed a model of ganglionic transmis sion characterized by adrenergically mediated hyperpolarizing potentials, many reports have appeared concerning the action and the physiologic role of catecholamines in sympa thetic ganglia. De Groat and Volle (9) have inves...

We have investigated the effects of prolonged systemic injections of nerve growth factor (NGF) and its antiserum on the survival and morphology of sympathetic ganglion cells in adult mice. Using intracellular injections of Lucifer yellow in lightly fixed superior cervical ganglia, we show that total dendritic lengths of ganglion cells are increased 29% after 2 weeks of NGF treatment. The increa...

The distributions of acetylcholinesterase (AChE) and butyrylcholinesterase (BuChE) in the superior cervical ganglion (SCG) of the cat were determined by electron microscopy (EM) with the bis-(thioacetoxy)aurate (I), or Au(TA)2, method. Before the infusion of fixative, one of the enzymes was selectively, irreversibly inactivated in vivo, as confirmed by light microscope (LM) examination of secti...

The maximum choline esterase activity of the superior cervical ganglion of the cat was measured and found to be, on the average, equivalent to the splitting of 0.10gamma of acetyl choline chloride per second per milligram of fresh tissue at a pH of 7.4 and 38 degrees . The least possible time required for destruction of the ester liberated by one nerve impulse was calculated to be 0.015sigma. T...

BACKGROUND Owls possess an extraordinary neck and head mobility. To understand this mobility it is necessary to have an anatomical description of cervical vertebrae with an emphasis on those criteria that are relevant for head positioning. No functional description specific to owls is available. METHODOLOGY/PRINCIPAL FINDINGS X-ray films and micro-CT scans were recorded from American barn owl...