"Pterion" Natural Recordings by Native Speakers
The term "pterion" refers to a diamond-shaped membrane located in the ear of a bat and some other flying animals, specifically a D-shaped or kite-shaped structure that forms the posterior part of the tragus, and thought to be an important aspect in sound emission in bats and dolphins.
In human anatomy, particularly in relation to the ear, the term "pterion" can refer to the area in the temporal region (skull area located in front of the ear) from which the temporal fascia is attached. This area is called the "pterion" because, when the temporal fascia is reflected onto the frontal bone, the shape formed resembles a pterion (derived from Greek word "pteros," meaning "wing"). However, this geographical space should be mostly intact for the muscle forces of mastication and facial expression not to become lost for the affected side (facial paralysis).
The Pteridospermophyta is an order of extinct seed ferns that lived during the Permian and Triassic periods, about 270-228 million years ago. They were part of the group of plants known as the pteridosperms or "seed ferns," which were common plants that had evolved from fern-like ancestors but had evolved seeds.<br><br>These plants were characterized by having seed-like ovules, typically enclosed within leaf-like structures, which were often modified into protective structures called cupules. They produced seeds that were dispersed by wind, rather than relying on water or other agents for propagation. Pteridospermophyta had dispersed seeds that were often peltate, with stalks that radiated from a central point, and mechanism suggesting that they might have been leyzed in its lyres shape are recorded.
Pteridospermatophyta is an extinct group of seed plants, also known as pteridosperms. They were a type of vascular plant that lived on Earth during the Paleozoic and Mesozoic Eras, around 370-150 million years ago.<br><br>The name Pteridospermatophyta comes from the Greek words "pteron", meaning wing, and "sperma", meaning seed, indicating that these plants were thought to have produced seeds similar to ferns (pteridosperms were related to modern cycads and ginkgos) but had a more terrestrial growth habit.<br><br>Pteridospermatophyta were some of the first plants to evolve seeds, a significant innovation that allowed them to disperse their offspring more effectively and ultimately led to the success of the flowering plant lineage. Some well-known examples of pteridosperms include the genus Matonia, Glossopteris, and Sagenopteris.<br><br>These plants likely grew as large trees or shrubs, had fern-like leaves, and produced cones or cupules to contain their seeds. Their seeds were enclosed in cupules or seed-bearing structures and helped establish the pattern for the modern gymnosperms, which include conifers, cycads, and ginkgos.
Pteridophyta is a division of vascular plants, also known as the cryptogams. They are plants that produce their seeds on the outside of their spores, and are characterized by their non-flowering reproductive structure, such as cones, leaves, and roots.<br><br>In simpler terms, pteridophyta are vascular plants that reproduce by spores rather than seeds, and include ferns, horsetails, and club mosses. They are part of the plant kingdom but differ from flowering plants (angiophyta) in their reproductive system.
Pteris is a genus of a fern family, particularly true ferns, and several of its species are called lucky ferns.
Pterobranchia is a subphylum of hemichordates, a group of marine animals that also includes the more familiar acorn worms. They typically live on a substratum in depths ranging from near-surface to more than 4,000 meters.
Pterocarya is a genus of deciduous trees in the walnut family, Juglandaceae. They are native to Asia and eastern North America and are characterized by their distinctive pinnate leaves and winged seeds.