rostrum

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rostrum

1. a platform or dais in front of an orchestra on which the conductor stands
2. another word for ram (sense 4)
3. the prow or beak of an ancient Roman ship
4. Biology Zoology a beak or beaklike part

Rostrum

 

(1) In fish, the anterior part of the neurocranium, located in front of the olfactory capsules. The rostrum is especially prominent as an integral cartilaginous process in Acipen-seridae, for example, in the stellate sturgeon (Acipenser stellatus) and Scaphirhyncus, and in chondrichthians, for example, in the sawfish and saw shark. In the smooth hound and other fish the rostrum is represented by three separate outgrowths. In the sawfish and saw shark large cutaneous teeth (placoid scales) are located along the sides of the rostrum; in these animals, the rostrum resembles a saw and serves as a weapon of defense and attack. In the majority of Batoidei the anterior edges of the pectoral fins are attached to the rostrum. The rostrum is reduced in many contemporary bony fishes and in terrestrial vertebrates.

(2) In reptiles and birds, the anterior process of the basisphe-noid bone. The rostrum is formed by the concrescence of the integumentary sphenoid bone to the basisphenoid bone.

rostrum

[′rä·strəm]
(biology)
A beak or beaklike process.

rostrum

A platform, elevated area, pulpit, or the like for addressing an audience.
References in periodicals archive ?
episcopus (internal 4), share the flexor cranial facial zone not funded medially (character 2, condition 1); present rostral prominence (character 3, condition 1); absent median rostral concavity (character 4, condition 0); relation medial x caudal condyle of the quadrate caudal > medial (character 24, condition 1); caudal expansion of the present choanal fossa (character 35, condition 1); short maxillopalatine process (character 13, condition 0) and absent transpalatine process (character 34, condition 0).
a) Dorsal view, b) detail of rostral spine, c) ventral view showing the posterior spines with spinules distributed symmetrically.
Surgical treatment and a unique management of rostral mandibular fracture with cerclage wire in a horse.
In all treatment groups, AAV-transduced, immunostained axons and BDA-immunolabelled axons were seen in the contralateral CST rostral to the injury site.
is the first late Tournaisian shallow-water European siphonodellid species possessing three rostral ridges.
A ventrodorsal (intraoral) radiograph (Figure 1C) of the rostral mandible showed a well-defined osseous mass with intense radiopaque areas and different degrees of ossification, visualized as dispersed radiolucent points inside the mass.
Reduced cortical thickness on left middle frontal gyrus and left rostral cingulate.
1B): Ovoid body with the maximum width at the second abdominal segment level; light browned head, jugum and tylus; four dark browned spines at the margin of the jugum; reddish small eyes; dark browned thorax; pronotum with disperse punctuations at its surface; mesonotum with a transversal punctuation row at the middle part; metanotum with a transversal dark browned row of punctuations at its base; pale yellowed antennal and rostral segments; convex mesonotum at the posterior margin in the middle part indicating the scutellum formation; yellowish to white legs; pale pinked abdomen.
We observed that activated caspase-8 labeling appears in the soma of "poor survivor" descending neurons within 2 weeks following a SCI [30, 31] and that the appearance of activated caspase-8 in the cell body was preceded by its activation in the injured axon rostral to the site of injury [31].
With this in mind, the team examined a specific region called the rostral dorsolateral pontine tegmentum.
Brain mapping revealed that in 10 of the 12 coma patients, a small area of the brainstem - the rostral dorsolateral pontine tegmentum - was significantly damaged.