| PNET | Primitive Neuro-Ectodermal(-Epithelial) Tumor |
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| HbP | primitive hemoglobin |
| PNET | peripheral neuroepithelioma; primitive neuroectodermal tumor |
| PPNET | Peripheral primitive neuroectodermal tumor |
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| PNET | Primitive Neuroectodermal Tumor |
| PTA | Primitive trigeminal artery |
| PHSC | primitive hematopoietic stem cell |
| PS | primitive streak |
| primitive meninx | The embryonic loose mesenchymatous tissue surrounding the brain and spinal cord; from it the three definite meninges (arachnoidea, dura mater, and pia mater) are derived. Synonym: meninx primitiva. Meninx serosa, obsolete term for arachnoidea; the arachnoid is actually not a serous membrane. (05 Mar 2000) |
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| vascular meninx | <anatomy> Rarely used term for pia mater. Synonym: meninx vasculosa. (05 Mar 2000) |
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| meninx | Any membrane; specifically, one of the membranous coverings of the brain and spinal cord. See: arachnoidea, dura mater, pia mater. Origin: Mod. L. Fr. G. Meninx, membrane Meninx fibrosa, rarely used term for dura mater. (05 Mar 2000) |
| meninx primitiva | The embryonic loose mesenchymatous tissue surrounding the brain and spinal cord; from it the three definite meninges (arachnoidea, dura mater, and pia mater) are derived. Synonym: meninx primitiva. Meninx serosa, obsolete term for arachnoidea; the arachnoid is actually not a serous membrane. (05 Mar 2000) |
| meninx tenuis | The two delicate layers of the meninges, the arachnoid mater and pia mater (vs. The tough pachymeninx or dura mater), considered together; by this concept, the arachnoid and pia are two parts of a single layer, much like the parietal and visceral layers of a serous membrane or bursa; although separated by the subarachnoid space they are connected via the arachnoid trabeculae and become continuous where the nerves and filum terminale exit the subarachnoid space (the cerebrospinal fluid-filled space bounded by the leptomeninges). See: arachnoid, pia mater. Synonym: meninx tenuis, pia-arachnoid, piarachnoid. Origin: Lepto-+ G. Meninx, pl. Meninges, membrane (05 Mar 2000) |
| meninx vasculosa | <anatomy> Rarely used term for pia mater. Synonym: meninx vasculosa. (05 Mar 2000) |
| primitive | Undeveloped or in early stages of development, undifferentiated. (16 Dec 1997) |
| primitive aorta | The paired aortic primordia in young embryos. (05 Mar 2000) |
| primitive chorion | The chorion before its villi are well formed. Synonym: previllous chorion. (05 Mar 2000) |
| primitive costal arches | Arch's formed in the thoracic region of the vertebral column in the embryo from the costal processes or costal elements which give rise to the ribs. (05 Mar 2000) |
| primitive erythroblast | <cell biology> Large cell with euchromatic nucleus found in mammalian embryos. In the mouse, the cells are located in the yolk sac and are responsible for early production of erythrocytes with foetal haemoglobin. (18 Nov 1997) |
| primitive furrow | The median depression in the primitive streak flanked by the primitive ridges. Synonym: primitive furrow. (05 Mar 2000) |
| primitive groove | The median depression in the primitive streak flanked by the primitive ridges. Synonym: primitive furrow. (05 Mar 2000) |
| primitive gut | A flat sheet of intraembryonic endoderm that will change into a tubular gut due to the folding of embryonic body-head, tail and lateral body folds. Synonym: archenteron, celenteron, endodermal canal, subgerminal cavity. (05 Mar 2000) |
| primitive knot | A local thickening of the blastoderm at the cephalic end of the primitive streak of the embryo. Synonym: Hensen's knot, Hensen's node, Hubrecht's protochordal knot, primitive knot, protochordal knot. (05 Mar 2000) |
| primitive neuroectodermal tumour | A designation used to refer to a group of morphologically similar embryonal neoplasms that arise in intracranial and peripheral sites of the nervous system and which may show various degrees of cellular differentiation; includes medulloblastoma, pineoblastoma, etc. (05 Mar 2000) |
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