The anterior median fissure (ventral or ventromedian fissure) contains a fold of pia mater, and extends along the entire length of the medulla oblongata : It ends at the lower border of the pons in a small triangular expansion, termed the foramen cecum.
What is the ventral median fissure?
: a groove along the anterior midline of the spinal cord that incompletely divides it into symmetrical halves . — called also ventral median fissure.
Where is the dorsal median fissure?
The posterior median sulcus of medulla oblongata (or posterior median fissure or dorsal median sulcus) is a narrow groove; and exists only in the closed part of the medulla oblongata ; it becomes gradually shallower from below upward, and finally ends about the middle of the medulla oblongata, where the central canal ...
What is the function of the ventral median fissure?
The anterior median fissure provides a groove in which the anterior spinal artery sits . From here, it provides the anterior part of the spinal cord. It is sourced from the segmental medullary arteries and the segmental spinal arteries which are sourced from the intercostal arteries.
Where is the anterior median fissure located on the spinal cord?
The spinal cord has fissure and sulci. The anterior median fissure is located centrally , and the anterior white commissure is present at its base. The posterior median sulcus is present posteriorly, and the posterolateral sulcus is present on either side of it. The anterior nerve roots exit at the anterolateral sulcus.
Is ventral a motor?
| Ventral root of spinal nerve | FMA 5979 | Anatomical terminology |
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What are Rami?
rami) (Latin for branch) is the anterior division of a spinal nerve . The ventral rami supply the antero-lateral parts of the trunk and the limbs. ... Shortly after a spinal nerve exits the intervertebral foramen, it branches into the dorsal ramus, the ventral ramus, and the ramus communicans.
What is the dorsal fissure?
1. a shallow vertical groove in the closed part of the medulla oblongata, continuous with the posterior median fissure of the spinal cord. 2. a shallow vertical groove dividing the spinal cord throughout its length in the midline posteriorly; called also posterior median sulcus.
What do dorsal roots do?
Dorsal nerve roots carry sensory neural signals to the central nervous system (CNS) from the peripheral nervous system (PNS). ... Until recently, the dorsal root ganglion has been considered a passive organ that metabolically assists functions and pathways between the PNS and CNS.
What is median sulcus?
Medical Definition of posterior median sulcus
: a shallow groove along the midline of the posterior part of the spinal cord that separates the two posterior funiculi and is the external boundary of the posterior median septum.
What is the function of the ventral root?
the motor root of a spinal nerve, which carries motor information from the spinal cord to the rest of the body and leaves from the anterior side of the cord .
What is the GREY matter?
Anatomical terminology. Grey matter (or gray matter) is a major component of the central nervous system , consisting of neuronal cell bodies, neuropil (dendrites and unmyelinated axons), glial cells (astrocytes and oligodendrocytes), synapses, and capillaries.
What is the function of anterior Funiculus?
The ventral spinothalamic tract, located in the anterior funiculus, transmits crude touch and pressure sensation . The lateral spinothalamic tract lies in the ventral part of the lateral funiculus and transmits pain and temperature sensation.
What is the difference between a fissure and a sulcus?
The terms fissure and sulcus as they are classically de- fined are: a fissure separates one lobe from another , while a sulcus is within a lobe and delimits gyri. The fissures and sulci of the cerebral hemispheres can be arranged into three groups according to their location.
What is longitudinal fissure?
: the deep groove that divides the cerebrum into right and left hemispheres .
What is Brown Séquard syndrome?
Brown-Sequard syndrome (BSS) is a rare neurological condition characterized by a lesion in the spinal cord which results in weakness or paralysis (hemiparaplegia) on one side of the body and a loss of sensation (hemianesthesia) on the opposite side.
