rastrum

A rostrum is a raised platform on which someone stands when they are speaking to an audience, receiving a prize, or conducting an orchestra. As he stood on the winner's rostrum, he sang the words of the national anthem.

Rostrum, originally "animal snout or bird's beak" in Latin, has a back-and-forth history. The word came to be used for the battering beak at a warship's bow. The ancient Romans used beaks from captured ships to decorate a platform from which orators could speak, called the rostra, the plural of rostrum.

(1) A beak-like or snout-like projection, such as that of the crocodile or dolphin, or the beak of birds. (2) The beak or sucking mouth parts, especially of hemiptera. (3) The anterior or foremost extension of the carapace of crustaceans, e.g. the lobster and the prawn.

The rostrum is a large diameter, thin-walled tubular structure that receives loads from the teeth. The rostrum can be conceptualized both as a rigid structure and as an assemblage of several bones that interface at sutures.

In mammals, the rostrum is that part of the cranium located in front of the zygomatic arches, where it holds the teeth, palate, and nasal cavity. Additionally, the corpus callosum of the human brain has a nerve tract known as the rostrum.

shape of the rostrum: Two main types can be distinguished in the shape of the rostrum: one in which the nasals form an equilateral triangle (Fig. 8, a), and a second in which this structure is pentagonal (Fig. 8, b).

The rostrum surface is relatively smooth, with no clearly defined convex edges or grooves, and relatively few setae and pores (Figure 1B,D,F). The mouthparts of E. scrobiculatus and E.

Rostrum – The rostrum is what gives the sawfish its common name. It is made of cartilage and is long and flat. The teeth along the side margins of the rostrum are not really teeth but rather modified scales. Different species of sawfish have rostrums and rostral teeth of different shapes and sizes.

In mammals, the rostrum is that part of the cranium located in front of the zygomatic arches, where it holds the teeth, palate, and nasal cavity. The beak or snout of a vertebrate may also be referred to as the rostrum.

It is generally a rigid structure, but can be connected by a hinged joint, as seen in Leptostraca. Among insects, the rostrum is the name for the piercing mouthparts of the order Hemiptera as well as those of the snow scorpionflies, among many others. The long snout of weevils is also called a rostrum.

Frogs of the genus Hemiphractus have distinct triangle-shaped heads and spiky protuberences above their eyes, on their rostrum, legs and sides.

Definition. In mammals, the rostrum is that part of the cranium located in front of the zygomatic arches, where it holds the teeth, palate, and nasal cavity. The beak or snout of a vertebrate may also be referred to as the rostrum.