Medullary striae of fourth ventricle

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Medullary striae of fourth ventricle
Gray709.png
Rhomboid fossa (striae medullares labeled at center left)
Details
Identifiers
Latin striae medullares ventriculi quarti
TA98 A14.1.05.318
A14.1.05.707
TA2 6046
FMA 78484
Anatomical terms of neuroanatomy

The medullary striae of fourth ventricle are a landmark of the rhomboid fossa - the floor of the fourth ventricle. They are part of the auditory system. [1] The medullary striae are formed by crossed-over anterior internal arcuate fibers - efferents of the arcuate nucleus of medulla oblongata - as they pass laterally beneath the ependyma of the fourth ventricle to reach the contralateral cerebellum. [2] :445.e1 The striae pass over the dorsal aspect of the medial vestibular nucleus. [2] :453

Contents

The medullary striae delineate the boundary between the pons and medulla oblongata dorsally/posteriorly. [2] :442,450

Additional images

Related Research Articles

<span class="mw-page-title-main">Medulla oblongata</span> Structure of the brain stem

The medulla oblongata or simply medulla is a long stem-like structure which makes up the lower part of the brainstem. It is anterior and partially inferior to the cerebellum. It is a cone-shaped neuronal mass responsible for autonomic (involuntary) functions, ranging from vomiting to sneezing. The medulla contains the cardiac, respiratory, vomiting and vasomotor centers, and therefore deals with the autonomic functions of breathing, heart rate and blood pressure as well as the sleep–wake cycle. "Medulla" is from Latin, ‘pith or marrow’. And "oblongata" is from Latin, ‘lengthened or longish or elongated'.

<span class="mw-page-title-main">Brainstem</span> Posterior part of the brain, adjoining and structurally continuous

The brainstem is the stalk-like part of the brain that connects the forebrain with the spinal cord. In the human brain, the brainstem is composed of the midbrain, the pons, and the medulla oblongata. The midbrain is continuous with the thalamus of the diencephalon through the tentorial notch.

<span class="mw-page-title-main">Glossopharyngeal nerve</span> Cranial nerve IX, for the tongue and pharynx

The glossopharyngeal nerve, also known as the ninth cranial nerve, cranial nerve IX, or simply CN IX, is a cranial nerve that exits the brainstem from the sides of the upper medulla, just anterior to the vagus nerve. Being a mixed nerve (sensorimotor), it carries afferent sensory and efferent motor information. The motor division of the glossopharyngeal nerve is derived from the basal plate of the embryonic medulla oblongata, whereas the sensory division originates from the cranial neural crest.

<span class="mw-page-title-main">Nucleus ambiguus</span> Group of motor neurons in the brain stem

The nucleus ambiguus is a group of large motor neurons situated in the reticular formation of the medulla oblongata of the brainstem. It represents a shared cranial nerve nucleus of the glossopharyngeal nerve, and vagus nerve ; the cranial root of accessory nerve is now also considered as (displaced) fibers of CN X arising from the caudal nucleus ambiguus to travel some distance with those of the CN XI before joining the main CN X.

<span class="mw-page-title-main">Fourth ventricle</span> One of four central brain cavities filled with cerebrospinal fluid

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 fourth ventricle extends from the cerebral aqueduct to the obex, and is filled with cerebrospinal fluid (CSF).

<span class="mw-page-title-main">Olivary body</span>

The olivary bodies or simply olives are a pair of prominent oval structures on either side of the medullary pyramids in the medulla, the lower portion of the brainstem. They contain the olivary nuclei.

<span class="mw-page-title-main">Pontine nuclei</span> Parts of the mammalian brain

The pontine nuclei are all neurons of the ventral pons collectively. Corticopontine fibres project from the primary motor cortex to the ipsilateral pontine nucleus; pontocerebellar fibers then relay the information to the contralateral cerebellum via the middle cerebellar peduncle.

<span class="mw-page-title-main">Posterior grey column</span>

The posterior grey column is one of the three grey columns of the spinal cord. It is a pronounced, dorsolaterally-oriented ridge of gray matter in either lateral half of the spinal cord. When viewed in transverse section, it is termed the posterior horn or dorsal horn.

<span class="mw-page-title-main">Inferior cerebellar peduncle</span>

The upper part of the posterior district of the medulla oblongata is occupied by the inferior cerebellar peduncle, a thick rope-like strand situated between the lower part of the fourth ventricle and the roots of the glossopharyngeal and vagus nerves.

<span class="mw-page-title-main">Cisterna magna</span> Space in the brain

The cisterna magna is the largest of the subarachnoid cisterns. It occupies the space created by the angle between the caudal/inferior surface of the cerebellum, and the dorsal/posterior surface of the medulla oblongata. The fourth ventricle communicates with the cistern via the unpaired midline median aperture. It is continuous inferiorly with the subarachnoid space of the spinal canal.

<span class="mw-page-title-main">Accessory cuneate nucleus</span>

The accessory cuneate nucleus is a nucleus situated in the caudal medulla oblongata just lateral to the cuneate nucleus. It relays unconscious proprioceptive sensory information from the upper limb and upper trunk to the cerebellum via the cuneocerebellar fibers.

<span class="mw-page-title-main">Posterior inferior cerebellar artery</span>

The posterior inferior cerebellar artery (PICA) is the largest branch of the vertebral artery. It is one of the three main arteries that supply blood to the cerebellum, a part of the brain. Blockage of the posterior inferior cerebellar artery can result in a type of stroke called lateral medullary syndrome.

The dorsal longitudinal fasciculus (DLF) is a longitudinal tract interconnecting the posterior hypothalamus, and the inferior medulla oblongata. It contains both ascending tracts and descending tracts, and serves to link the forebrain, and the visceral autonomic centres of the lower brainstem. It conveys both visceral motor signals, and sensory signals.

<span class="mw-page-title-main">Arcuate nucleus (medulla)</span>

In the medulla oblongata, the arcuate nucleus is a group of neurons located on the anterior surface of the medullary pyramids. These nuclei are the extension of the pontine nuclei.

<span class="mw-page-title-main">Dorsal column nuclei</span> Nuclei in the dorsal column of the brainstem

In neuroanatomy, the dorsal column nuclei are a pair of nuclei in the dorsal columns in the brainstem. The name refers collectively to the cuneate nucleus and gracile nucleus, which are situated at the lower end of the medulla oblongata. Both nuclei contain second-order neurons of the dorsal column–medial lemniscus pathway, which convey fine touch and proprioceptive information from the body to the brain. The dorsal column nuclei project to the thalamus.

<span class="mw-page-title-main">Taenia of fourth ventricle</span> Bands of white matter in the brain

In the brain, the taenia of the fourth ventricle are two narrow bands of white matter, one on either side, which complete the lower part of the roof of the fourth ventricle.

<span class="mw-page-title-main">Posterior spinal artery</span>

The posterior spinal artery arises from the vertebral artery in 25% of humans or the posterior inferior cerebellar artery in 75% of humans, adjacent to the medulla oblongata. It is usually double, and spans the length of the spinal cord. It supplies the grey and white posterior columns of the spinal cord.

<span class="mw-page-title-main">Dorsal nucleus of vagus nerve</span>

The dorsal nucleus of vagus nerve is a cranial nerve nucleus of the vagus nerve situated in the medulla oblongata of the brainstem ventral to the floor of the fourth ventricle. It contains nerve cell bodies of parasympathetic neurons of CN X that provide parasympathetic innervation to the gastrointestinal tract and lungs as well as other thoracic and abdominal organs. These functions include, among others, bronchoconstriction and gland secretion.

Perihypoglossal nuclei are three prominent groups of neurons in the caudal medulla oblongata near the hypoglossal nucleus: the nucleus prepositus hypoglossi, intercalated nucleus, and sublingual nucleus. They are involved in controlling eye movements: they send their principal projections to the three cranial nerve nuclei controlling extrinsic eye muscles via the medial longitudinal fasciculus.

References

  1. Waschke, Jens; Böckers, Tobias M.; Paulsen, Friedrich; Arnold, Wolfgang; Bechmann, Ingo, eds. (2018). Sobotta Anatomy Textbook: English Edition with Latin Nomenclature (1st ed.). München: Elsevier. p. 672. ISBN   978-0-7020-6760-0.
  2. 1 2 3 Standring, Susan (2020). Gray's Anatomy: The Anatomical Basis of Clinical Practice (42th ed.). New York: Elsevier. ISBN   978-0-7020-7707-4. OCLC   1201341621.