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 are the boundaries of the rhomboid fossa?
Between the midbrain aqueduct rostrally and central canal of medulla caudally, its lateral boundaries are formed by the superior cerebellar peduncles, inferior peduncles, cuneate and gracile tubercles (Fig. 5.3). At its widest level it has a lateral recess on each side.
What is the function of the rhomboid fossa?
Fourth ventricle
| Walls | Lateral walls – formed by cerebellar peduncles Roof – formed by cerebellar peduncles, superior and inferior medullary velum Floor – formed by rhomboid fossa |
|---|---|
| Functions | Production of cerebrospinal fluid (CSF) by choroid plexus Circulation of CSF |
| Clinical relations | Hydrocephalus, medulloblastoma |
Where does the rhomboid fossa from a ground the vestibular area?
The rhomboid fossa is a rhombus-shaped depression that is the anterior part of the fourth ventricle. Its anterior wall, formed by the back of the pons and the medulla oblongata, constitutes the floor of the fourth ventricle….
| Rhomboid fossa | |
|---|---|
| TA2 | 5971 |
| FMA | 78486 |
| Anatomical terms of neuroanatomy |
What is a rhomboid shape?
Definition of rhomboid (Entry 1 of 2) : a parallelogram with no right angles and with adjacent sides of unequal length.
What a groove has the rhomboid fossa?
the fourth ventricle
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.
Is Interpeduncular fossa and rhomboid fossa 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.
How many cochlear nuclei are in rhomboid fossa?
4
There are 4 subnuclei; they are situated at the floor of the fourth ventricle. corresponding to the lower part of the area acustica in the rhomboid fossa; the caudal end of this nucleus is sometimes termed the descending or spinal vestibular nucleus.
What is superior fovea?
The superior fovea has a triangular shape that is an important landmark for the motor nucleus of the trigeminal, abducens, and facial nerves. The inferior half of the superior fovea triangle may be incised to remove deep dorsal pontine lesions through the floor of the fourth ventricle.
Is there a rhomboid fossa on the left clavicle?
Incidental prominant left rhomboid fossa of the clavicle on the left – a normal variant. At the attachment of the costoclavicular (rhomboid) ligament, there may be a tuberosity or depression, known as the rhomboid fossa of variable size that may mimic disease. A rhomboid fossa is more common in younger adults and males.
What is the fossa of rhomboid?
RHOMBOID FOSSA. Diamond shaped excavation found on the dorsal side of medulla oblangata and pons. Contains nuclei of Cranial nerves 5 – 12. Delimited by Sup & Inf cerebral peduncles. Features four angles – Sup,Inf and two lateral angles. The fossa consists of three parts, superior, intermediate, and inferior.
What are normal cardiomediastinal contours and hilar regions of the clavicle?
Cardiomediastinal contours and hilar regions within normal limits. Incidental prominant left rhomboid fossa of the clavicle on the left – a normal variant. At the attachment of the costoclavicular (rhomboid) ligament, there may be a tuberosity or depression, known as the rhomboid fossa of variable size that may mimic disease.
What is the anatomy of the clavicle?
Relevant Anatomy. The clavicle, or collar bone, is an S -shaped bone anterior to the base of the neck. Through articulations with the sternum medially and with the scapula at the acromion process laterally, it serves as an osseous connection between the axial skeleton and the upper extremity.