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1. In anatomy, a thin, flat, structure, such as a lamina or lamella. 2. A metal bar applied to a fractured bone in order to maintain the ends in apposition. 3. The agar layer within a Petri dish or similar vessel. 4. To form a very thin layer of a bacterial culture by streaking it on the surface of an agar p. (usually within a Petri dish) in order to isolate individual organisms from which a colonial clone will develop. [O.Fr. plat, a flat object, fr. G. platys, flat, broad]
alar p. of neural tube alar lamina of neural tube
anal p. the anal portion of the cloacal p.
axial p. the primitive streak of an embryo.
basal p. of neural tube basal lamina of neural tube
base p. See baseplate.
blood p. platelet
bone p. a metal bar with perforations for the insertion of screws; used to immobilize fractured segments.
buttress p. a metal p. used to support the internal fixation of a fracture.
cardiogenic p. the thickened layer of splanchnic mesoderm from which the cardiopericardial primordia of very young embryos are derived.
cell p. a non-cellulose structure that is the precursor to the cell wall; it forms between daughter nuclei during mitosis.
chorionic p. that portion of the chorionic wall in the region of its uterine attachment; it consists of the mesoderm that lines the chorionic vesicle and, on the maternal side, of the trophoblast that lines the intervillous spaces; in the last half of gestation, the mesodermal connective tissue is largely replaced by fibrinoid material, and the amniotic membrane is adherent to the fetal side of the plate.
cloacal p. a p., composed of a layer of cloacal endoderm in contact with a layer of proctodeal ectoderm, which subsequently ruptures, forming the anal and urogenital openings of the embryo.
cribriform p. of ethmoid bone a horizontal p. from which are suspended the labyrinth, on either side, and the p. perpendicularis in the center; it fits into the ethmoidal notch of the frontal bone and supports the olfactory lobes of the cerebrum, being pierced with numerous openings for the passage of the olfactory nerves.lamina cribrosa ossis ethmoidalis [NA], cribrum, sieve bone, sieve p;
cutis p. dermatome (2)
dorsal p. of neural tube roof p
dorsolateral p. of neural tube alar lamina of neural tube
end p. See endplate.
epiphysial p. the disc of cartilage between the metaphysis and the epiphysis of an immature long bone permitting growth in length.cartilago epiphysialis [NA], epiphysial cartilage;
equatorial p. the assembly of chromosomes in mitosis.
ethmovomerine p. the central portion of the ethmoid bone, forming a distinct element at birth.
flat p. jargon for plain film.
floor p. ventral midline thinning of the developing neural tube, a continuity between the basal laminae of either side; opposite of roof plate.ventral p;
foot p. See footplate.
frontal p. in the fetus, a cartilage p. between the lateral parts of ethmoid cartilage and the developing sphenoid bone.
horizontal p. of palatine bone the part of the palatine bone that forms the posterior part (approximately one third) of the bony palate.lamina horizontalis ossis palatini [NA];
Kühne's p. the endplate of a motor nerve fiber in a muscle spindle.
Lane's p.'s flattened, narrow, metal p.'s of various shapes and sizes, perforated for screws; used to hold the fragments of a fractured bone in apposition.
lateral p. a nonsegmented mass of mesoderm on the lateral periphery of the embryonic disk.
lateral pterygoid p. the larger and more lateral of the two bony plates extending downward from the point of union of the body and greater wing of the sphenoid bone on either side; forms medial wall of intfratemporal fossa and gives origin to pterygoi muscles.lamina lateralis processus pterygoidei [NA], lateral p. of pterygoid process;
lateral p. of pterygoid process lateral pterygoid p
lingual p. linguoplate
medial pterygoid p. the smaller and more medial of the two bony plates extending downward from the point of union of the body and greater wing of the sphenoid bone on either side. ending inferiorly in the pterygoid hamulus.lamina medialis processus pterygoidei [NA], medial p. of pterygoid process;
medial p. of pterygoid process medial pterygoid p
medullary p. neural p
p. of modiolus a bony plate, the continuation of the modiolus and of the septum between the convolutions of the spiral canal of the cochlea extending upward toward the cupola, forming with the hamulus the helicotrema.lamina modioli [NA];
motor p. a motor endplate.
muscle p. myotome (2)
nail p. nail
neural p. the unpaired neuroectodermal region of the early embryo's dorsal surface which in later development is transformed into the neural tube and neural crest.medullary p;
neutralization p. a metal p. used for the internal fixation of a long bone fracture to neutralize the forces producing displacement.
notochordal p. the sheet of notochordal cells that are intercalated in the endodermal roof of the primitive yolk sac. See also head process.
oral p. a circumscribed area of fusion of foregut endoderm and stomodeal ectoderm in the embryo which breaks through early in development to establish the oral opening. See also buccopharyngeal membrane.
orbital p. orbital p. of ethmoid bone
orbital p. of ethmoid bone a thin plate of ethmoid bone forming part of the medial wall of the orbit and the lateral wall for the ethmoidal labyrinth.lamina orbitalis ossis ethmoidalis [NA], lamina papyracea, orbital lamina of ethmoid bone, orbital layer of ethmoid bone, orbital p., paper p., papyraceous p;
palatal p. a partial denture major connector that has an anteroposterior width in excess of two maxillary premolars.
paper p. , papyraceous p. orbital p. of ethmoid bone
parachordal p. the cartilage primordia of the base of the skull situated on either side of the cephalic part of the notochord.
parietal p. 1. the outer of the two layers of the lateral plate mesoderm, which becomes associated with the ectoderm; the ectoderm and parietal plate mesoderm together constitute the somatopleure; 2. the lamina of the ethmoid bone that forms the nasal septum.
perpendicular p. flat portion of a bone which lies within or closely approximates a vertical plane. See perpendicular p. of ethmoid bone, perpendicular p. of palatine bone.lamina perpendicularis [NA], pars perpendicularis, vertical p;
perpendicular p. of ethmoid bone a thin plate of bone projecting downward from the crista galli of the ethmoid; it forms part of the nasal septum.lamina perpendicularis ossis ethmoidalis [NA];
perpendicular p. of palatine bone the part of the palatine bone that extends vertically upward from the horizontal lamina; it forms part of the lateral wall of the nasal cavity.lamina perpendicularis ossis palatini [NA];
phosphor p. the coated p. used in place of a radiographic film cassette in a computed radiography system.
polar p.'s condensed platelike bodies at the ends of the spindle during mitosis of certain types of cells.
prechordal p. prochordal p
prochordal p. a small area immediately rostral to the cephalic tip of the notochord where ectoderm and endoderm are in contact; when turned under the growing head, it forms the pharyngeal membrane. See also oral p.prechordal p;
pterygoid p.'s See lateral pterygoid p., medial pterygoid p.
quadrigeminal p. lamina of mesencephalic tectum
roof p. the thin layer of the embryonic neural tube connecting the alar p.'s dorsally.dorsal p. of neural tube;
secondary spiral p. secondary spiral lamina
segmental p. segmental zone
sieve p. cribriform p. of ethmoid bone
spiral p. osseous spiral lamina
suction p. in dentistry, a p. held in place by atmospheric pressure.
tarsal p.'s See superior tarsus, inferior tarsus.
terminal p. lamina terminalis of cerebrum
tympanic p. of temporal bone the bony p. forming the greater part of the anterior wall of the bony part of the external acoustic meatus and the tympanic cavity and the posterior wall of the mandibular fossa.pars tympanica ossis temporalis [NA], tympanic part of temporal bone;
urethral p. an endodermal p. located ventromedially in the developing genital tubercle of a young embryo; it later opens to form the lining of the penile urethra.
ventral p. floor p
ventral p. of neural tube basal lamina of neural tube
vertical p. perpendicular p
visceral p. the inner of the two layers of the lateral mesoderm; the splanchnic mesoderm that becomes associated with the endoderm and together with it constitutes the splanchnopleure.
wing p. alar lamina of neural tube
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