(bŭn′dĕl)


1. A group of fibers.
SYN: SEE: fasciculus
2. A multicomponent clinical intervention.
SYN: SEE: fasciola

Arnold bundle

SEE: Arnold, Friedrich

atrioventricular bundle

ABBR: A-V bundle SEE: Bundle of His.

cingulate bundle

SEE: Cingulum.

cingulum bundle

SEE: Cingulum.

efferent cochlear bundle

SEE: Olivocochlear bundle.

ground bundle

A bundle of nerve fibers immediately surrounding the gray matter of the spinal cord. It is divided into three regions, the anterior, lateral, and posterior bundles, which lie in the corresponding funiculi.

bundle of His

SEE: His, Wilhelm Jr.

bundles of Kent

SEE: Kent bundles.

medial forebrain bundle

A diffuse limbic tract of lightly myelinated and unmyelinated axons interconnecting the forebrain, hypothalamus, and brainstem. Along with the dorsal longitudinal fasciculus, the medial forebrain bundle is the main pathway by which monoaminergic axons from cells in the hindbrain and midbrain reach the striatum, the limbic system, and the cerebral cortices of the forebrain.

medial longitudinal bundle

SEE: Medial longitudinal fasciculus.

nigrostriate bundle

A dopaminergic axon tract from the substantia nigra to the striatum in the basal ganglia. Activation of the nigrostriate bundle inhibits the striatum, which normally lowers the activity of motor programs. In Parkinson disease, neurons in the substantia nigra are damaged, and their effect on the striatum is reduced; the result is unchecked activity of the striatum and an excessive damping of motor programs, i.e., hypokinetic behavior.
SYN: SEE: nigrostriatal fibers

olivocochlear bundle

An axon tract that originates in the superior olivary nuclei of the hindbrain. The tract exits the brainstem and runs in the vestibulocochlear nerve (CN VIII), eventually synapsing on hair cells in the cochlea in the inner ear. The olivocochlear bundle is one pathway by which the auditory system can modify its perception of sound.
SYN: SEE: efferent cochlear bundle

thoracodorsal bundle

The nerve, artery, and vein that adjoin the latissimus dorsi muscle about 1.5 in (4 cm) below the axillary vein. The bundle defines the lateral border of the axilla in axillary lymph node dissection for breast cancer.

bundle of Türck

The fibers that pass from the cerebral cortex of the temporal lobe and terminate in the pons.

ventilator bundle

A cluster of four evidenced-based safety measures that decrease the risk to patients of mechanical ventilation while in the intensive care unit. The elements of the bundle may include elevating the head of the patient's bed, administering medications to prevent deep venous thrombosis, administering medications to reduce the incidence of GI bleeding, and giving the ventilated patient periodic intermissions from sedation.

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