| truncus arteriosus, persistent | A congenital anomaly resulting from the failure of the aorticopulmonary system to develop and divide the truncus arteriosus into the aorta and the pulmonary trunk. (12 Dec 1998) |
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| truncus brachiocephalicus | The first and largest artery branching from the aortic arch. It distributes blood to the right side of the head and neck and to the right arm. (12 Dec 1998) |
| truncus bronchiomediastinalis | A lymphatic vessel arising from the union of the efferent lymphatics from the tracheo-bronchial and mediastinal nodes on either side. On the left side, it may be largely replaced by direct drainage into the thoracic duct. Synonym: truncus bronchiomediastinalis. (05 Mar 2000) |
| truncus coeliacus | Origin, abdominal aorta just below diaphragm; branches, left gastric, common hepatic, splenic. Synonym: truncus coeliacus, arteria coeliaca, coeliac artery, coeliac axis, Haller's tripod. (05 Mar 2000) |
| truncus corporis callosi | The main arched portion of the corpus callosum. Synonym: truncus corporis callosi. (05 Mar 2000) |
| truncus costocervicalis | A short artery that arises from the subclavian artery on each side and divides into deep cervical and superior intercostal branches, the latter dividing usually to form the first and second posterior intercostal arteries. Synonym: truncus costocervicalis, costocervical artery. (05 Mar 2000) |
| truncus inferior plexus brachialis | The nerve bundle formed by the union of the ventral rami of the eighth cervical and first thoracic nerves; it provides fibres to the posterior and medial cords (fasciculi) of the brachial plexus. Synonym: truncus inferior plexus brachialis. (05 Mar 2000) |
| truncus jugularis | Lymphatic vessel on each side, conveying the lymph from the head and neck; that on the right side empties into the right lymphatic duct, that on the left into the thoracic duct. Synonym: truncus jugularis, jugular duct. (05 Mar 2000) |
| truncus linguofacialis | The common trunk by which the lingual and facial arteries frequently arise from the external carotid artery. Synonym: truncus linguofacialis. (05 Mar 2000) |
| truncus lumbosacralis | A large nerve, formed by the union of the fifth lumbar and first sacral nerves, with a branch from the fourth lumbar nerve, which enters into the formation of the sacral plexus. Synonym: truncus lumbosacralis. (05 Mar 2000) |
| truncus medius plexus brachialis | The continuation of the ventral ramus of the seventh cervical nerve; it contributes fibres to the posterior and lateral cords (fasciculi) of the brachial plexus. Synonym: truncus medius plexus brachialis. (05 Mar 2000) |
| truncus pulmonalis | Origin, right ventricle of heart; distribution, it divides into the right pulmonary artery and the left pulmonary artery, which enter the corresponding lungs and branch along with the segmental bronchi. Synonym: truncus pulmonalis, arteria pulmonalis, pulmonary artery, venous artery. (05 Mar 2000) |
| truncus subclavius | It is formed by the union of the vessels draining the lymph nodes of either upper limb, emptying into the thoracic duct at the root of the neck on the left or into the right lymphatic duct. Synonym: truncus subclavius, subclavian duct. (05 Mar 2000) |
| truncus superior plexus brachialis | The nerve bundle formed by the union of the ventral rami of the fifth and sixth cervical nerves and some fibres from the fourth; it contributes fibres to the posterior and lateral cords (fasciculi) of the brachial plexus. Synonym: truncus superior plexus brachialis. (05 Mar 2000) |
| truncus sympathicus | One of the two long ganglionated nerve strands alongside the vertebral column that extend from the base of the skull to the coccyx; they are connected to each spinal nerve by gray rami and receive fibres from the spinal cord through white rami connecting with the thoracic and upper lumbar spinal nerves. Synonym: truncus sympathicus, gangliated cord. (05 Mar 2000) |