Sulcus limitans
Encyclopedia
In the floor of the fourth ventricle
, the sulcus limitans separates the cranial nerve motor nuclei (medial) from the sensory nuclei (lateral). In the superior part of the rhomboid fossa
, it corresponds with the lateral limit of the fossa and presents a bluish-gray area, the locus ceruleus
(which owes its color to an underlying patch of deeply pigmented nerve cells, termed the substantia ferruginea
).
In the embryo, the term refers to slight depressions separating the basal
and alar
plates along the length of the neural tube
.
Fourth ventricle
The fourth ventricle is one of the four connected fluid-filled cavities within the human brain. These cavities, known collectively as the ventricular system, consist of the left and right lateral ventricles, the third ventricle, and the fourth ventricle...
, the sulcus limitans separates the cranial nerve motor nuclei (medial) from the sensory nuclei (lateral). In the superior part of the rhomboid fossa
Rhomboid fossa
The anterior part of the fourth ventricle is named, from its shape, the rhomboid fossa, and its anterior wall, formed by the back of the pons and medulla oblongata, constitutes the floor of the fourth ventricle....
, it corresponds with the lateral limit of the fossa and presents a bluish-gray area, the locus ceruleus
Locus ceruleus
The locus coeruleus , is a nucleus in the brainstem involved with physiological responses to stress and panic. It was discovered in the 18th century by Félix Vicq-d'Azyr....
(which owes its color to an underlying patch of deeply pigmented nerve cells, termed the substantia ferruginea
Substantia ferruginea
The substantia ferruginea is an underlying patch of deeply pigmented nerve cells that give the locus ceruleus its bluish-gray color. It can be found in the region of the superior part of the rhomboid fossa.-External links:**...
).
In the embryo, the term refers to slight depressions separating the basal
Basal plate (neural tube)
In the developing nervous system, the basal plate is the region of the neural tube ventral to the sulcus limitans. It extends from the rostral mesencephalon to the end of the spinal cord and contains primarily motor neurons, whereas neurons found in the alar plate are primarily associated with...
and alar
Alar plate
The alar plate is a neural structure in the embryonic nervous system, part of the dorsal side of neural tube, that involves the communication of general somatic and general visceral sensory impulses. The caudal part later becomes sensory axon part of the spinal cord.-External links:* *...
plates along the length of the neural tube
Neural tube
In the developing vertebrate, the neural tube is the embryo's precursor to the central nervous system, which comprises the brain and spinal cord...
.
External links
- Diagram at susqneuro.com
- http://isc.temple.edu/neuroanatomy/lab/atlas/panfc/
