What is sulcus limitans?
Description. The sulcus limitans separates the cranial nerve motor nuclei from the sensory nuclei. 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.
What is sulcus limitans in spinal cord?
The sulcus limitans that is present on the ventrolateral wall of the fourth ventricle provides the plane of division of the medulla into a ventromedial basal plate and a dorsolateral alar plate, which have the same functional significance as in the spinal cord development.
Is rhomboid fossa and Interpeduncular fossa are same?
The interpeduncular fossa is a somewhat rhomboid-shaped area of the base of the brain, limited in front by the optic chiasma, behind by the antero-superior surface of the pons, antero-laterally by the converging optic tracts, and postero-laterally by the diverging cerebral peduncles.
Is sulcus limitans present in adults?
Developmental Neuroscience The dorsal and ventral halves of the neural tube are separated by the sulcus limitans, an external protrusion from the central canal that demarcates the alar plate above from the basal plate below. This important landmark persists at some sites in the adult ventricular system.
What is the rhomboid fossa?
The rhomboid fossa is the shallow, diamond shaped depression on the dorsal surface of the pons and medulla oblongata that forms the floor of the fourth ventricle 1. It is covered by grey matter which is continuous with the spinal cord. It may be divided into two parts: superior. upward triangular in shape.
What is a brain sulcus?
A sulcus (plural: sulci) is another name for a groove in the cerebral cortex. Each gyrus is surrounded by sulci and together, the gyri and sulci help to increase the surface area of the cerebral cortex and form brain divisions.
Which of the following nuclei is found lateral to the sulcus limitans?
The region lateral to the sulcus limitans is the vestibular area which overlies the vestibular nuclei (cranial nerve nuclei responsible for hearing and balance). The vestibular area lies partly in the pons and partly in the medulla.
What is interpeduncular fossa?
The interpeduncular fossa has a wedge-shaped depression between the cerebral peduncles and contains the posterior perforated substance in its floor6 (Figs. 1 and 2). The perforating arteries pass through the posterior perforated substance to supply the thalamus.
What is Taenia Choroidea?
The tela choroidea (or tela chorioidea) is a region of meningeal pia mater that adheres to the underlying ependyma, and gives rise to the choroid plexus in each of the brain’s four ventricles. Tela is Latin for woven and is used to describe a web-like membrane or layer.
Where can I find sulcus limitans?
The sulcus limitans is found in the fourth ventricle of the brain. It separates the cranial nerve motor nuclei (medial) from the sensory nuclei (lateral). It can also be located by searching laterally from the medial eminence. It is parallel to the median sulcus.
What is rostral fold?
The two neural folds fuse together and pinch off to become the neural tube. Fusion of the neural folds begins in the middle of the embryo and moves cranially and caudally. The cranial open end of the tube is the anterior (rostral) neuropore, and the caudal open end of the tube is the posterior (caudal) neuropore.
What is foramen of Luschka?
Results: The foramina of Luschka are paired apertures located in the lateral recesses of the fourth ventricle, within the posterior cranial fossa. The foramina of Luschka are of importance clinically as their blockage can disrupt the flow of cerebrospinal fluid leading to the development of hydrocephalus.
What is the sulcus limitans in anatomy?
Anatomical terms of neuroanatomy. [edit on Wikidata] The sulcus limitans is found in the fourth ventricle of the brain. It separates the cranial nerve motor nuclei (medial) from the sensory nuclei (lateral). The sulcus limitans can also be located by searching laterally from the medial eminence.
What is the locus coeruleus in rhomboid fossa?
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 coeruleus, which owes its color to an underlying patch of deeply pigmented nerve cells, termed the substantia ferruginea .
Rhomboid fossa. (Sulcus limitans not labeled, but region is visible.) Human caudal brainstem posterior view (The sulcus limitans separates #2 from #4.) The sulcus limitans is found in the fourth ventricle of the brain. It separates the cranial nerve motor nuclei (medial) from the sensory nuclei (lateral).
Is the sulcus limitans present in the alar plate?
Rostral to the mesencephalon, the sulcus limitans is no longer evident in the neural tube and the diencephalon and telencephalon are considered to be developments of the alar plate.