Back حفرة معينية Arabic Fossa romboïdal Catalan Rautengrube German Fosa romboidal Spanish Rombauk Estonian 마름오목 Korean Rombinė duobė Lithuanian Dół równoległoboczny Polish Ромбовидная ямка Russian
| Rhomboid fossa | |
|---|---|
 Hind-brain of a human embryo of three months—viewed from behind and partly from left side. (Rhomboid fossa labeled at center.) | |
 Rhomboid fossa. | |
| Details | |
| Identifiers | |
| Latin | fossa rhomboidea |
| NeuroNames | 631 |
| TA98 | A14.1.05.702 |
| TA2 | 5971 |
| FMA | 78486 |
| Anatomical terms of neuroanatomy | |
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.
It is covered by a thin layer of grey matter continuous with that of the spinal cord; superficial to this is a thin lamina of neuroglia which constitutes the ependyma of the ventricle and supports a layer of ciliated epithelium.