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Related Concept Videos

The Auditory Ossicles01:11

The Auditory Ossicles

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The auditory ossicles of the middle ear transmit sounds from the air as vibrations to the fluid-filled cochlea. The auditory ossicles consist of two malleus (hammer) bones, two incus (anvil) bones, and two stapes (stirrups), one on each side. These bones develop during the fetal stage and are the ones to ossify first. They are fully mature at birth and do not grow afterward.
The aptly named stapes look very much like a stirrup. The three ossicles are unique to mammals, and each plays a role in...
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The Hyoid Bone01:12

The Hyoid Bone

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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...
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Larynx01:21

Larynx

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The human larynx, often referred to as the voice box, is an intricate organ located in the neck. It serves as a pathway for air to enter the lungs during respiration and is an essential component of voice production.
Anatomy of the Larynx
The larynx consists of various components, including cartilage, muscles, and vocal cords. Its structure includes three large unpaired cartilages—the thyroid, cricoid, and epiglottis—and three smaller paired cartilages—the arytenoids,...
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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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Muscles of the Shoulder01:23

Muscles of the Shoulder

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The muscles surrounding the shoulder girdle, including the clavicle and scapula, primarily stabilize the scapula. This stable base allows other muscles to move the humerus effectively. Scapular movements often mirror those of the humerus and extend its range of motion. For instance, raising the arm above the head would not be feasible without simultaneous upward rotation of the scapula.
Anterior Thoracic Muscles
The anterior thoracic muscles include the serratus anterior, subclavius, and...
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Articulations of the Vertebral Column01:28

Articulations of the Vertebral Column

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In addition to being held together by the intervertebral discs, adjacent vertebrae also articulate with each other at synovial joints formed between the superior and inferior articular processes called zygapophysial joints (facet joints). These are plane joints that provide for only limited motions between the vertebrae. The orientation of the articular processes at these joints varies in different regions of the vertebral column and serves to determine the types of motions available in each...
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Related Experiment Video

Updated: Mar 7, 2026

Dissection of the Auditory Bulla in Postnatal Mice: Isolation of the Middle Ear Bones and Histological Analysis
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Dissection of the Auditory Bulla in Postnatal Mice: Isolation of the Middle Ear Bones and Histological Analysis

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The labrum acetabulare in infants.

R Graf1

  • 1Allgemeines und Orthopädisches Landeskrankenhaus, Stolzalpe, Germany.

Der Orthopade
|March 2, 2017
PubMed
Summary

Understanding hip joint embryology, particularly the acetabular labrum, is crucial for diagnosing developmental hip dysplasia. Modern imaging clarifies labral morphology in decentered hips, aiding diagnosis and terminology. Further research is needed.

Area of Science:

  • Orthopedics
  • Developmental Biology
  • Radiology

Background:

  • Knowledge of hip joint embryology, especially the acetabular labrum's development, is essential for understanding hip dysplasia and dislocations.
  • Distinguishing between "teratologic" luxations (fetal damage) and "developing deformations" is critical for accurate diagnosis and treatment.

Purpose of the Study:

  • To clarify the morphologic relationships of the acetabular labrum in centered and decentered hip joints using modern imaging techniques.
  • To establish clear and consistent terminology for the acetabular roof cartilage, differentiating between the "acetabular labrum" and "hyalin-preformed cartilaginous acetabular roof."

Main Methods:

  • Utilized advanced imaging techniques, specifically sonography and Magnetic Resonance Imaging (MRI).
  • Visualized the acetabular labrum's tip, base, and their relationship with the acetabular roof cartilage during hip decentering.
Keywords:
Key words Acetabular labrum • Hip luxation • Hip sonography • Labral lesion

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Main Results:

  • Modern imaging techniques successfully clarified the morphologic relationships of the acetabular labrum in both centered and decentered hip joints.
  • Sonography clearly visualized changes in the labrum and its relation to the acetabular roof during the process of hip decentering.
  • Identified the need to avoid the term "limbus" and use precise terms like "acetabular labrum" and "hyalin-preformed cartilaginous acetabular roof."

Conclusions:

  • A clear understanding of hip joint embryology and labral development is fundamental for diagnosing hip pathologies.
  • Consistent terminology is vital for accurately describing morphologic changes in decentered hips.
  • Further basic research is necessary to understand the acetabular labrum's size, shape, vascularity, and potential micro-damage from treatments.