| PPA | palpation, percussion, auscultation; pepsin A; phenylpropanolamine; phenylpyruvic acid; Pittsburgh p... |
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| RBA | relative binding affinity; rescue breathing apparatus; right basilar artery; right brachial artery; ... |
| RCA | red cell agglutination; relative chemotactic activity; renal cell carcinoma; right carotid artery; r... |
| SOA-MCA | superficial occipital artery to middle cerebral artery |
| STA-MCA | superficial temporal artery to middle cerebral artery |
| thoracic longissimus muscle | <anatomy, muscle> Origin, with iliocostalis and from transverse processes of lower thoracic vertebrae; insertion, by lateral slips into most or all of the ribs between angles and tubercles and into tips of transverse processes of upper lumbar vertebrae, and by medial slips into accessory processes of upper lumbar and transverse processes of thoracic vertebrae; action, extends vertebral column; nerve supply, dorsal primary rami of thoracic and lumbar spinal nerves. Synonym: musculus longissimus thoracis, musculus longissimus dorsi, thoracic longissimus muscle. (05 Mar 2000) |
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| thoracic nerves | The twelve pairs of spinal nerves that arise from the thoracic segments of the spinal cord, each pair leaving the vertebral column below the correspondingly numbered vertebra. They innervate the body wall of the thorax and abdomen. (12 Dec 1998) |
| thoracic nucleus | A column of large neurons located in the base of the posterior gray column of the spinal cord, extending from the first thoracic through the second lumbar segment; it gives rise to the dorsal spinocerebellar tract of the same side. Synonym: nucleus thoracicus, Clarke's column, Clarke's nucleus, dorsal nucleus, nucleus dorsalis, Stilling's column, Stilling's nucleus. (05 Mar 2000) |
| thoracic outlet syndrome | <syndrome> Condition due to compromise of blood vessels or nerve fibres between the armpit (axilla) and base of the neck. (12 Dec 1998) |
| thoracic part of aorta | The part of the descending aorta that supplies structures as far down as the diaphragm. Synonym: pars thoracica aortae, aorta thoracica, thoracic part of aorta. (05 Mar 2000) |
| thoracic part of oesophagus | The part of the oesophagus between the superior thoracic aperture and the diaphragm. Synonym: pars thoracica oesophagi. (05 Mar 2000) |
| thoracic part of spinal cord | The part of the spinal cord which consists of the twelve thoracic segments of the spinal cord from which the twelve pairs of thoracic nerves originate. Synonym: pars thoracica medullae spinalis, segmenta medullae spinalis thoracica. (05 Mar 2000) |
| thoracic-pelvic-phalangeal dystrophy | Hereditary hypoplasia of the thorax, associated with pelvic skeletal abnormality. Synonym: asphyxiating thoracic chondrodystrophy, Jeune's syndrome, thoracic-pelvic-phalangeal dystrophy. (05 Mar 2000) |
| thoracic respiration | Respiration effected chiefly by the action of the intercostal and other muscles that raise the ribs, causing expansion of the chest. Synonym: costal respiration. (05 Mar 2000) |
| thoracic rotator muscles | The rotators of the thoracic vertebrae. Synonym: musculi rotatores thoracis, thoracic rotator muscles. (05 Mar 2000) |
| thoracic spinal nerves | Twelve nerves on each side, mixed motor and sensory, supplying the muscles and skin of the thoracic and abdominal walls. Synonym: nervi thoracici. (05 Mar 2000) |
| thoracic spine | The thoracic region of the vertebral column; the thoracic vertebrae as a whole; that part of the vertebral column which enters into the formation of the thorax. (05 Mar 2000) |
| thoracic spine fracture | <orthopaedics> Bony fracture of one of the twelve thoracic vertebrae. (27 Sep 1997) |
| thoracic splanchnic nerves | Splanchnic nerves arising from the thoracic portion of the sympathetic trunks; the upper thoracic splanchnic nerves (from T1 to T4 or 5) pass to viscera above the diaphragm (mainly heart and lungs) and so are cardiopulmonary splanchnic nerves; the lower thoracic splanchnic nerves form the greater, lesser, and lowest splanchnic nerves and supply viscera below the level of the diaphragm, and so are abdominopelvic splanchnic nerves. (05 Mar 2000) |
| thoracic stomach | A condition in which part or all of the stomach is contained within the thorax; a variant of hiatal hernia. Trifid stomach, a condition in which the stomach is divided by two constrictions into three pouches. Wallet stomach, a form of dilated stomach in which there is a general bag like distention, the antrum and fundus being indistinguishable. Water-trap stomach, a ptotic and dilated stomach, having a relatively high (though normally placed) pyloric outlet which is held up by the gastrohepatic ligament. Synonym: drain-trap stomach. (05 Mar 2000) |