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.
What is the posterior 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.
Where is the posterior median sulcus quizlet?
The posterior median sulcus is
the posterior end of the posterior median septum of neuroglia of the spinal cord
. The septum varies in depth from 4 to 6 mm, but diminishes considerably in the lower part of the spinal cord.
How many sulci and fissures are located on the external surface of the spinal cord *?
Two prominent
grooves, or sulci, run along its length. The posterior median sulcus is the groove in the dorsal side, and the anterior median fissure is the groove in the ventral side.
What does anterior median fissure do?
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.
What is the anterior horn?
The anterior horn of the spinal cord (also known as the anterior cornu)
contains the cell bodies of motor neurons that affect the skeletal muscles
.
What is the function of median sulcus?
The median sulcus of the tongue
separates the body into left and right halves
. The terminal sulcus, or groove, is a V-shaped furrow that separates the body from the base of the tongue.
Where is the anterior gray horn?
Anterior horn cells (α-motor neurons), located
in the anterior gray matter of the spinal cord
, are found at every segment and are concentrated in the cervical and lumbosacral enlargements. Morphologic differentiation of the anterior horn cells is most evident from 12 to 14 weeks’ gestation.
Is ventral a motor?
| Ventral root of spinal nerve | FMA 5979 | Anatomical terminology |
|---|
Where is the dorsal median sulcus located?
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 …
Where is the gray commissure?
gray matter that
surrounds the central canal and connects the two halves of the spinal cord
.
Which column is found between the anterior gray horn and the ventral median fissure?
The anterior white column
– lies between the anterior gray horns and the anterior median fissure- has both ascending & descending tracts.
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 are brain gyri?
A gyrus (plural: gyri) is the
name given to the bumps ridges on the cerebral cortex
(the outermost layer of the brain). Gyri are found on the surface of the cerebral cortex and are made up of grey matter, consisting of nerve cell bodies and dendrites.
Which is the largest part of the brain?
The cerebrum
(front of brain) comprises gray matter (the cerebral cortex) and white matter at its center. The largest part of the brain, the cerebrum initiates and coordinates movement and regulates temperature.
