Subthalamic fasciculus

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Subthalamic fasciculus
DA-loops in PD.jpg
DA-loops in Parkinson's disease (Subthalamic fasciculus visible but not labeled.)
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Identifiers
Latin fasciculus subthalamicus
NeuroNames 2280
TA A14.1.08.677
A14.1.09.522
FMA 77525
Anatomical terms of neuroanatomy

The subthalamic fasciculus is a bi-directional neural tract that connects the subthalamic nucleus and the globus pallidus. [1]

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The interposed nucleus is part of the deep cerebellar complex and is composed of the globose nucleus and the emboliform nucleus. It is located in the roof of the fourth ventricle, lateral to the fastigial nucleus. It receives its afferent supply from the anterior lobe of the cerebellum and sends output via the superior cerebellar peduncle to the red nucleus.

Subthalamus part of diencephalon

The subthalamus or prethalamus is a part of the diencephalon. Its most prominent structure is the subthalamic nucleus. The subthalamus connects to the globus pallidus, a basal nucleus of the telencephalon.

Facial colliculus

The facial colliculus is an elevated area located on the pontine tegmentum in the floor of the fourth ventricle. It is formed by fibers from the facial motor nucleus of the facial nerve as they loop over the abducens nucleus. Thus a lesion to the facial colliculus would result in ipsilateral facial paralysis and ipsilateral unopposed eye medial deviation.

Posterior thoracic nucleus

The posterior thoracic nucleus, is a group of interneurons found in the medial part of lamina VII, also known as the intermediate zone, of the spinal cord. It is mainly located from the cervical vertebra C7 to lumbar L3-L4 levels and is an important structure for proprioception of the lower limb.

Superior cerebellar peduncle

In the human brain, the superior cerebellar peduncle is a paired structure of white matter that connects the cerebellum to the midbrain. It consists mainly of efferent fibers, the cerebellothalamic tract that runs from a cerebellar hemisphere to the contralateral thalamus, and the cerebellorubral tract that runs from a cerebellar hemisphere to the red nucleus. It also contains afferent tracts, most prominent of which is the ventral spinocerebellar tract. Other afferent tracts are the trigeminothalamic fibers, tectocerebellar fibers, and noradrenergic fibers from the locus coeruleus. The superior peduncle emerges from the upper and medial parts of the white matter of each hemisphere and is placed under cover of the upper part of the cerebellum.

The primary olfactory cortex is a portion of the cerebral cortex involved in olfaction.

Medial eminence of floor of fourth ventricle

In the human brain, the rhomboid fossa is divided into symmetrical halves by a median sulcus which reaches from the upper to the lower angles of the fossa and is deeper below than above. On either side of this sulcus is an elevation, the medial eminence, bounded laterally by a sulcus, the sulcus limitans.

Thalamic fasciculus

The thalamic fasciculus is a component of the subthalamus. It is synonymous with field H1 of Forel. Nerve fibres form a tract containing cerebellothalamic (crossed) and pallidothalamic (uncrossed) fibres, that is insinuated between the thalamus and the zona incerta.

Lenticular fasciculus

The lenticular fasciculus is a tract connecting the globus pallidus (internus) to the thalamus and is a part of the thalamic fasciculus. It is synonymous with field H2 of Forel. The thalamic fasciculus (composed of both the lenticular fasciculus and ansa lenticularis) runs to the thalamus. Basically, it is part of a pathway that connects the globus pallidus and the thalamus.

Basilar part of pons

The basilar part of pons, also known as basis pontis, is the ventral part of the pons; the dorsal part is known as the pontine tegmentum.

Medial vestibular nucleus

The medial vestibular nucleus is one of the vestibular nuclei. It is located in the medulla oblongata.

Rostral interstitial nucleus of medial longitudinal fasciculus

The rostral interstitial nucleus of medial longitudinal fasciculus (riMLF) is a portion of the medial longitudinal fasciculus which controls vertical gaze.

Inferior vestibular nucleus

The inferior vestibular nucleus is the vestibular nucleus which lies near the fourth ventricle.

Lens placode

The Lens placode is a thickened portion of ectoderm which serves as the precursor to the lens.

Lateral olfactory stria

The lateral olfactory stria is directed across the lateral part of the anterior perforated substance and then bends abruptly medially toward the uncus of the parahippocampal gyrus.

Pontocerebellar fibers

The pontocerebellar fibers are the second order neuron fibers of the corticopontocerebellar tracts that cross to the other side of the pons and run within the middle cerebellar peduncles, from the pons to the contralateral cerebellum.

Uvula of cerebellum

The uvula forms a considerable portion of the inferior vermis; it is separated on either side from the tonsil by the sulcus vallecula, at the bottom of which it is connected to the tonsil by a ridge of gray matter, indented on its surface by shallow furrows, and hence called the furrowed band.

Dentatothalamic tract

The dentatothalamic tract is a tract which originates in the dentate nucleus and follows the ipsilateral superior cerebellar peduncle, decussating later on and reaching the contralateral red nucleus and the contralateral thalamus..

The fields of Forel are areas in a deep part of the brain known as the diencephalon. They are below the thalamus and consist of three defined, white matter areas of the subthalamus. These three regions are also named "H fields":

References

  1. DeJong, Russell N.; Campbell, William; Haerer, Armin F. (2005). DeJong's the neurologic examination: incorporating the fundamentals of neuroanatomy and neurophysiology. Hagerstwon, MD: Lippincott Williams & Wilkins. p. 340. ISBN   0-7817-2767-7.