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Related Concept Videos

Ankle Joint01:10

Ankle Joint

The ankle is formed by the talocrural joint (crural = leg). It consists of the articulations between the talus bone of the foot and the distal ends of the tibia and fibula of the leg. The superior aspect of the talus bone is square-shaped and has three areas of articulation. The top of the talus articulates with the inferior tibia. This is the portion of the ankle joint that carries the body weight between the leg and foot. The sides of the talus are firmly held in position by the articulations...
Cranial Bones: Lateral View01:27

Cranial Bones: Lateral View

The lateral view of the cranium is dominated by temporal, sphenoid, and ethmoid bones.
The temporal bone forms the lower lateral side of the skull. The temporal bone is subdivided into several regions. The flattened upper portion is the squamous portion of the temporal bone. Below this area and projecting anteriorly is the zygomatic process of the temporal bone, which forms the posterior portion of the zygomatic arch. Posteriorly is the mastoid portion of the temporal bone. Projecting...
The Hyoid Bone01:12

The Hyoid Bone

The hyoid bone is a small U-shaped bone located in the upper neck at the level of the inferior mandible, with its tips pointing posteriorly. It does not directly articulate with any other bone in the body. The hyoid acts as the attachment site for the tongue, the larynx, and the pharynx. It is held in position by a series of small muscles attached from above or below. These muscles help to move the hyoid up/down or forward/back in coordination with movements of the tongue, larynx, and pharynx...
Microtubules in Signaling01:22

Microtubules in Signaling

The primary cilium, made up of microtubules, acts as antennae on the cell surfaces for relaying external stimuli into the cells. These fine hair-like structures are present, generally one per cell. These are non-motile cilia in a 9+0 microtubules arrangement, where the central pair of microtubules are absent. The primary cilia arise from the basal body embedded in the cell membrane. Intraflagellar transport (IFT) carries requisite proteins from the cytoplasm to the cilium because the primary...
Cranial Bones: Superior and Posterior View01:14

Cranial Bones: Superior and Posterior View

The superior view of the cranium shows the frontal and paired parietal bones.
The frontal bone is the single bone that forms the forehead. At its anterior midline, between the eyebrows, there is a slight depression called the glabella. The frontal bone also forms the supraorbital margin of the orbit. Near the middle of this margin is the supraorbital foramen, the opening that provides passage for a sensory nerve to the forehead. The frontal bone is thickened just above each supraorbital margin,...
Unusual Results01:16

Unusual Results

Unusual results are those that have a very low chance of occurring. Unusual results can be identified using probabilities and the range rule of thumb. In problems involving probability, unusual results can be observed in 2 instances – an unusually high number of successes or an unusually low number of successes.
According to the range rule of thumb, any value above or below two standard deviations, 2σ  from the mean, μ  is considered unusual.
Maximum unusual value = μ + 2σ
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Related Experiment Video

Updated: May 20, 2026

Three-Dimensional Cephalometric Landmark Annotation Demonstration on Human Cone Beam Computed Tomography Scans
10:23

Three-Dimensional Cephalometric Landmark Annotation Demonstration on Human Cone Beam Computed Tomography Scans

Published on: September 8, 2023

The talon cusp--an uncommon anomaly.

Jadbinder Seehra1, Fran Coutts

  • 1Department of Orthodontics and Paediatrics, Guy's and St Thomas's NHS Foundation Trust, Floor 22, Guy's Tower London SE1 9RT.

Dental Update
|July 11, 2012
PubMed
Summary

Talon cusps, an uncommon dental anomaly, can co-occur with other rare conditions. This report details two cases of talon cusps associated with ectopic canines and dental transposition.

Area of Science:

  • Dentistry
  • Oral Pathology
  • Developmental Biology

Background:

  • Talon cusps are a rare odontogenic anomaly, characterized by an accessory cusp-like structure projecting from the lingual or palatal surface of a tooth.
  • While often isolated, talon cusps can be associated with other dental anomalies, though such co-occurrences are infrequently documented.

Observation:

  • This report presents two distinct clinical cases.
  • Case 1 involved a talon cusp in conjunction with an ectopic canine.
  • Case 2 featured a talon cusp alongside dental transposition.

Findings:

  • The study highlights the co-occurrence of talon cusps with other specific dental anomalies.
  • These findings underscore the importance of thorough dental examination to identify associated conditions.

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  • The cases demonstrate variability in the presentation of talon cusps beyond typical isolated occurrences.

    • Implications:

    • Recognizing these combined anomalies is crucial for accurate diagnosis and treatment planning.
    • Further research is warranted to understand the underlying mechanisms and prevalence of these combined dental anomalies.
    • This documentation contributes to the limited literature on talon cusp associations, aiding dental professionals in managing complex cases.