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Anatomy of Respiratory System I: Upper Respiratory Tract01:29

Anatomy of Respiratory System I: Upper Respiratory Tract

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The upper respiratory tract plays a vital role in the respiratory system, comprising several structures that facilitate air intake and prepare air for the lungs. It also serves as the first line of defense against pathogens and particles. This tract includes the nose and nasal cavity, the oral cavity, the paranasal sinuses, and the pharynx, each with specific functions and features.
Nose and nasal cavity
The nose and nasal cavity represent the main external openings of the respiratory tract....
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Cranial Bones: Lateral View01:27

Cranial Bones: Lateral View

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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...
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Nose and Nasal Cavity01:24

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The nose is composed of an observable exterior segment (external nose) and an internal segment within the skull known as the nasal cavity (internal nose). The external nose, visible on the face, consists of a framework of bone and hyaline cartilage enveloped in skin and muscle and lined with a mucous membrane. This structure is supported by the frontal bone, nasal bones, and maxillary bone and is supplemented by a cartilaginous framework comprising the septal nasal cartilage, lateral nasal...
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Overview of the Skull01:08

Overview of the Skull

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The cranium (skull) is the skeletal structure of the head that supports the face and protects the brain. It is subdivided into the facial bones and the brain case, or cranial vault. The facial bones underlie the facial structures, form the nasal cavity, enclose the eyeballs, and support the teeth of the upper and lower jaws.
The cranial vault surrounds and protects the brain and houses the middle and inner ear structures. This cavity is bounded superiorly by the rounded top of the skull, which...
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Olfactory Receptors: Location and Structure01:03

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The process of olfaction, also known as the sense of smell, is a sophisticated chemical response system. The specialized sensory neurons that facilitate this process, known as olfactory receptor neurons, are situated in an upper segment of the nasal cavity, known as the olfactory epithelium. Olfactory sensory neurons are bipolar, with their dendrites extending from the epithelium's apex into the mucus that lines the nasal cavity. Airborne molecules, when inhaled, traverse the olfactory...
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Related Experiment Video

Updated: Aug 10, 2025

Author Spotlight: Development of a Novel Finite Element Analysis Model for Improved Orthognathic Surgical Techniques
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Author Spotlight: Development of a Novel Finite Element Analysis Model for Improved Orthognathic Surgical Techniques

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Human maxillary sinus size, shape, and surface area: Implications for structural and functional hypotheses.

Suhhyun Kim1,2,3, Lyndee A Ward1, Lauren N Butaric4

  • 1Center for Anatomical Sciences, Department of Physiology and Anatomy, University of North Texas Health Science Center, Fort Worth, Texas, USA.

American Journal of Biological Anthropology
|February 15, 2023
PubMed
Summary
This summary is machine-generated.

Human maxillary sinus (MS) volume variation is primarily driven by width and height, impacting shape and mucosal surface area. These findings offer insights into sinus development and function.

Keywords:
allometryparanasalpneumatizationscalingsinus function

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Area of Science:

  • Anthropology
  • Human Anatomy
  • Craniofacial Morphology

Background:

  • Maxillary sinus (MS) research often prioritizes volume, overlooking shape and surface area.
  • MS morphology is hypothesized to influence form and function.
  • Understanding MS morphology requires a comprehensive approach beyond just volume.

Purpose of the Study:

  • Investigate maxillary sinus (MS) volume alongside shape and surface area in modern humans.
  • Determine if MS volume variation correlates with predictable changes in MS shape (allometry).
  • Analyze how MS size-shape scaling affects mucosal surface area.

Main Methods:

  • CT scans of 162 human crania from diverse ancestral backgrounds were analyzed.
  • Measurements included MS volume, surface area, 3D coordinates, and linear dimensions.
  • Multivariate analyses assessed associations between MS volume and other morphological variables.

Main Results:

  • Significant associations were found between MS volume and 3D shape across and within samples.
  • MS volume variation is mainly linked to height and width relative to length.
  • Allometric scaling patterns influenced total mucosal surface area and the SAV ratio.

Conclusions:

  • Maxillary sinus (MS) volume variation is disproportionately influenced by width and height.
  • Findings impact hypotheses on MS morphology's link to craniofacial development.
  • Results inform theories regarding adaptive physiological roles of MS morphology.