By Leonard Hamilton
If this have been a standard textbook of neuroanatomy, many pages will be dedicated to an outline of the ascending and descending pathways of the spinal wire and several other chapters to the association of the sensory and motor structures, and, might be, a close dialogue of the neurological deficits that stick to a number of kinds of harm to the fearful procedure might even be incorporated. yet within the first draft of this booklet, the spinal twine used to be pointed out just once (in a determine caption of bankruptcy 2) on the way to illustrate the that means of longitudinal and pass sections. Later, it used to be made up our minds that even this cursory therapy of the spinal twine went past the scope of this article, and a carrot was once substituted because the version. The association of the sensory and motor structures and of the peripheral fearful procedure have obtained comparable insurance. hence, this isn't a standard textual content, and as a possible reader, you will be ended in ask, "What's during this booklet for me?" This ebook is directed basically towards these scholars of habit who're both bored or fearful by means of the medically orientated texts which are replete with scientific symptoms, complicated terminology, and prolix descriptions of the human mind, an organ which is rarely really noticeable of their laboratories. I should still hasten so as to add, although, that this article can also serve a few goal if you learn and even perhaps benefit from the conventional texts.
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Additional info for Basic Limbic System Anatomy of the Rat
In the most anterior regions of the septum, two thin bands of cells make up the medial and lateral septal nuclei. More posteriorly, the medial septal nucleus remains rather small amid the fibers and the nucleus of the diagonal band. By contrast, the lateral nuclei are more sparsely infiltrated with fibers and become very prominent bilateral structures. Near the posterior border of the septum, the fibers of the fornix columns descend through this structure and two additional septal nuclei become apparent-the triangular nucleus of the septum, which fills the small triangle formed between the fornix columns, and the septofimbrial nuclei, which are embedded within the fornix system.
The posterior border of the hypothalamus (panel F) is denoted by the appearance of the mammillary bodies (MB) and the posterior hypothalamic nucleus (PH). The mammillothalamic tract (MTT) is also shown. medial border and into the cortex at the level of the rhinal fissure (see Fig. 4-IIA). The small, irregular, and darkly staining clumps of cells observed throughout the amygdaloid complex are known as the intercalated masses. The thin line of cortical cells running ventrally and medially from the level of the rhinal fissure marks the boundary of the pyriform cortex (' 'pyriform" means pear-shaped and refers to the shape of the outline of the cortex between the rhinal fissure and the base of the hypothalamus).
These structures are known collectively as the hypothalamus. Several aspects of the hypothalamus can be observed on the ventral surface of the whole brain. As shown in Figure 4-9, the optic nerves converge and partially decussate to form the optic chiasm, which is attached at the base of the brain. Following this decussation, the fibers become a part of the central nervous system proper and are hence termed the optic tracts. Immediately posterior to the optic chiasm is the root of the infundibulum, from which the pituitary was torn off during the removal of the brain from the skull.