| POE | pediatric orthopedic examination; physician order entry; point of entry; polyoxyethylene; postoperat... |
|---|---|
| POS | periosteal osteosarcoma; physician order set; point of service; polycystic ovary syndrome; psychoorg... |
| RO | radiation oncology; radiation output; ratio of; relative odds; renal osteodystrophy; reverse osmosis... |
| SOB | see order blank; shortness of breath |
| TO | old tuberculin; oral temperature; original tuberculin; target organ; telephone order; thoracic ortho... |
| pregnancy trimester, third | Period of pregnancy from the beginning of the 29th through the 42nd completed week (197 to 294 days) of gestation. (12 Dec 1998) |
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| healing by third intention | The slow filling of a wound cavity or ulcer by granulations, with subsequent cicatrization. (05 Mar 2000) |
| pseudounipolar neuron | A neuron whose cell body emits a single axonal process resulting from the fusion of two polar processes during development; at a variable distance from the cell body, the process divides into a peripheral axon branch extending outward as a peripheral afferent (sensory) nerve fibre, and a central axon branch that enters into synaptic contact with neuron's in the spinal cord or brainstem. With the single known exception of the neuron's composing the mesencephalic nucleus of the trigeminus, unipolar neuron's are the exclusive neural elements of the sensory ganglia. The lack of dendritic processes of these primary sensory neuron's is only apparent: the dendritic pole of the unipolar neuron is represented by the unmyelinated terminal ramifications of the peripheral axon branch. Synonym: pseudounipolar cell, pseudounipolar neuron, unipolar cell. (05 Mar 2000) |
| sensory neuron | 1. <anatomy> A neuron that receives input from sensory cells. 2. <physiology> Sensory cells such as cutaneous mechanoreceptors and muscle receptors. (18 Nov 1997) |
| somatic motor neuron | See: motor neuron. (05 Mar 2000) |
| sphincter of third portion of duodenum | A physiological sphincter supposedly located at the horizontal (inferior) portion of the duodenum. (05 Mar 2000) |
| NANC neuron | <abbreviation> Nonadrenergic, noncholinergic neuron. (05 Mar 2000) |
| neuron | An excitable cell specialised for the transmission of electrical signals over long distances. Neurons receive input from sensory cells or other neurons and send output to muscles or other neurons. Neurons with sensory input are called sensory neurons, neurons with muscle outputs are called motoneurons, neurons that connect only with other neurons are called interneurons. Neurons connect with each other via synapses. Neurons can be the longest cells known, a single axon can be several metres in length. Although signals are usually sent via action potentials, some neurons are nonspiking. (18 Nov 1997) |
| styloid process of third metacarpal bone | A pointed projection from the dorsolateral angle of the base of the third metacarpal bone; it sometimes exists as a separate ossicle. Synonym: processus styloideus ossis metacarpalis III. (05 Mar 2000) |
| nonadrenergic, noncholinergic neuron | Autonomic efferent neuron whose transmission is not blocked by blocking adrenergic and cholinergic transmission. Nitric oxide may be the transmitter in some cases. (05 Mar 2000) |
| nonspiking neuron | <physiology> A neuron that can convey information without generating action potentials. As passive electrical potentials are attenuated over distances greater than the space constant for a neuron (typically 1mm), this implies that most nonspiking neurons are involved in signalling over relatively short distances. Typical examples are invertebrate stretch receptors and interneurons in the central nervous system. (12 Mar 1998) |
| syndrome, third and fourth pharyngeal pouch | See syndrome, digeorge. (12 Dec 1998) |
| intercalary neuron | A neuron interposed between and connecting two other neuron's. Synonym: intercalary neuron. (05 Mar 2000) |
| internuncial neuron | A neuron interposed between and connecting two other neuron's. Synonym: intercalary neuron. (05 Mar 2000) |
| third | 1. Next after the second; coming after two others; the ordinal of three; as, the thirdhour in the day. "The third night." 2. Constituting or being one of three equal parts into which anything is divided; as, the third part of a day. Third estate. In England, the commons, or the commonalty, who are represented in Parliament by the House of Commons. In France, the tiers etat. See Tiers etat. Third order See Third. Origin: OE. Thirde, AS. Ridda, fr. Ri, reo, three; akin to D. Derde third, G. Dritte, Icel. Rii, Goth. Ridja, L. Tertius, Gr, Skr. Ttiya. See Three, and cf. Riding a jurisdiction, Tierce. Source: Websters Dictionary (01 Mar 1998) |