Merriam Webster's Medical Desk Dictionary


Clauda: A tail like appendage. A tail.

Caudad: Towards the tail or posterior end.

Caudad Equina: The roots of the Upper Sacral Nerves that extend beyond the end of the Spinal Cord, at the first Lumbar Vertebra in the form of a bundle of filaments within the Spinal Canal resembling a horse's tail.

Caudal: Situated in or directed toward the hind part of the body.

Caudate Nuclius: One of four Basal Ganglia in each Cerebral Hemisphere that comprises a mass of Gray Matter in the Corpus Striatum. Forms part of the floor of the Lateral Ventricle, and is seperated from the Lentiform Nucleus by the Internal Capsule.

CerebroSpinal Fluid: A liquid that is comparable to Serum but contains less dissolved material. It is secreted from the blood into the Lateral Ventricles of the Brain by the Choroid Plexus.


It circulates through the Ventricles to the spaces between the Mennings about the Brain and Spinal Cord, and is resorbed into the blood through the SubArachnoid Sinuses, and it serves chiefly to maintain uniform pressure within the Brain and Spinal Cord.

Cerebral Artery

The Cerebral Cortex Arteries

  • The Anterior Cerebral Artery:
    Arises from the Internal Carotid Artery, forms the Anterior portion of the Circle Of Willis where it is linked to the artery on the opposite side by the Anterior Communicating Artery, and passes on to supply the medial surfaces of the Cerebrum.

  • The Middle Cerebral Artery:
    Arises from the Internal Carotid Artery, passes along the Lateral Fissure and supplies the Lateral surfaces of the Cerebral Cortex.

  • The Posterior Cerebral Artery:
    Arises by the terminal forking of the Basilar Artery, where it forms the Posterior portion of the Circle Of Willis and passes on to supply the lower surfaces of the Temporal and Occipital Lobes.

    Being or located near, on, or towards the front of the human body
  • The Median Lobe or part of the Cerebellum
  • Either of two parts of the Median Lobe of the Cerebellum:
    • One slightly prominent on the upper surface, called the Superior Vermis
    • The lower surface, sunk in the Vallecula, called the Inferior Vermis


The Anterior of the three major divisions of the developing Vertebrate Brain.
- the corresponding part of the adult Brain that includes the Rostrad.

Especially the Cerebral Hemispheres and more Caudally, the Thalamus and the HypoThalamus. [See: DienCephalon (TelenCephalon)].


In a Rostral direction; the Dorsal layer of the Fascia

Anterior or Ventral to the Pons

The reflected Anterior portion of the Corpus Callosum below the Genu.

Scanning Speech:
The slow enunciation with a tendency to hesitate at the beginning of a word or syllable is common in advanced disease.

The loss or impairments of the power to use or comprehend words. Usually resulting from a Brain Lesion.

SpinoThalamic Tract:
Any of the four Nerve Tracts of the Spinal Cord that are arranged in pairs with one member of a pair on each side and that ascend to the Thalamus, by way of the BrainStem.

  • One on each side of the Anterior Median Fissure that carries Nerve Impulses relating to the Sense of Touch. Also called Anterior SpinoThalamic Tract or Ventral SpinoThalamic Tract.

  • One on each Lateral part of the Spinal Cord that carries Nerve Impulses relating to the Senses of Touch, Pain, and Temperature. Also called Lateral SpinoThalamic Tract.

SpinoCerebellar Tract:
Any of four Nerve Tracts which pass from the Spinal Cord to the Cerebellum and of which two are situated on each side external to the crossed CorticoSpinal Tracts:

  • A Posterior Tract on each side that arises from cells in Clark's Column, especially on the same side and passes to the Inferior Cerebellar Peduncle and Vermis of the Cerebellum, also called Dorsal SpinoCerebellar Tract.

  • An Anterior Tract on each side that arises from cells mostly in the dorsal column of Gray Matter on the same or opposite side and passes through the Medulla Oblongata and Pons to the Superior Cerebellar Peduncle and Vermis. Also called Anterior SpinoCerebellar Tract.

PeriVentricular - situated or occuring around a Ventricle of the Brain, and within the White Matter.

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Updated On: 4/22/2004