Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

The Hyoid Bone

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...

Bones of the Upper Limb: Ulna

Bones of the Upper Limb: Ulna

The ulna and radius are parallel bones of the antebrachium or the forearm. The ulna lies medially and consists of a bony tip called the olecranon process at its proximal end. This hook-like projection articulates with the olecranon fossa of the humerus and forms the "hinged" ulnohumeral part of the elbow joint. This joint facilitates forearm extension and flexion while preventing its hyperextension. Similarly, the coronoid process, another bony projection on the proximal/anterior side of the...

Cranial Bones: Lateral View

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...

Bones of the Upper Limb: Radius

Bones of the Upper Limb: Radius

The radius is longer of the two bones that make up the human antebrachium or forearm. At the proximal end, the radius articulates with the capitulum of the humerus and the radial notch of the ulna to form the elbow joint. At the distal end, the radius articulates with the ulna via the ulnar notch, forming the distal radioulnar joint. Distally, the radius also attaches to the carpal wrist bones (scaphoid and lunate) to form the radiocarpal joint.
The radius has a nail-shaped head, and a short...

Muscles of the Anterior Neck

Muscles of the Anterior Neck

The anterior neck muscles are the group of muscles covering the front part of the neck. These muscles are classified into three subgroups. The first one is the superficial muscles, the most visible muscles in the front of the neck. It includes the platysma and sternocleidomastoid. The second group is the suprahyoid muscles, located above the hyoid bone. This group comprises the digastric, mylohyoid, geniohyoid, and stylohyoid. Lastly, the infrahyoid muscles are found below the hyoid bone and...

Bones of the Upper Limb: Humerus

Bones of the Upper Limb: Humerus

The upper limb consists of the arm, forearm, wrist, and hand bones. The humerus is the single bone of the upper arm region. Proximally, it has a large, spherical, smooth head that articulates with the glenoid cavity of the scapula to form the glenohumeral or shoulder joint. The margin of the head is the anatomical neck, a residual epiphyseal plate. Laterally it extends to form bony projections called the greater tubercle and the lesser tubercle. Next to the tubercles is the surgical neck, a...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by

Same author

Does Preoperative Aprepitant Reduce Nausea and Emesis After Orthognathic Surgery?

The Journal of craniofacial surgery·2026

Same author

Is Patient-Specific Hardware for Orthognathic Surgery More Frequently Removed Than Stock Plates?

Journal of oral and maxillofacial surgery : official journal of the American Association of Oral and Maxillofacial Surgeons·2025

Same author

Improving early detection of temporomandibular joint involvement in juvenile idiopathic arthritis with a clinically interpretable machine learning model.

Scientific reports·2025

Same author

Barriers to Adoption of the Pre-Epiglottic Baton Plate (Tübingen Palatal Plate) for Infants With Robin Sequence.

The Cleft palate-craniofacial journal : official publication of the American Cleft Palate-Craniofacial Association·2025

Same author

What Factors Affect Safe Bedside Extubation After Mandibular Distraction?

The Cleft palate-craniofacial journal : official publication of the American Cleft Palate-Craniofacial Association·2025

Same author

Value of Personal Engagement Versus Delegation in Surgical Practice.

Journal of oral and maxillofacial surgery : official journal of the American Association of Oral and Maxillofacial Surgeons·2025

Search research articles

Related Experiment Video

Updated: May 27, 2026

A Morphometric and Cellular Analysis Method for the Murine Mandibular Condyle

A Morphometric and Cellular Analysis Method for the Murine Mandibular Condyle

Published on: January 11, 2018

Accessory mandibular condyle at the coronoid process.

Zachary S Peacock¹, Cory M Resnick, William C Faquin

¹Departmentsof Oral & Maxillofacial Surgery and Pathology, Massachusetts General Hospital, Harvard School of Dental Medicine, and Harvard Medical School, Boston, Massachusetts 02114, USA. zpeacock@partners.org

The Journal of Craniofacial Surgery

|November 15, 2011

Summary

This summary is machine-generated.

Coronoid process hyperplasia, a rare cause of limited jaw movement, can stem from various factors. This case details a unique non-neoplastic accessory mandibular condyle on the coronoid process, a novel finding in Jacob's disease.

More Related Videos

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

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

Published on: September 8, 2023

Coronoid-Temporalis Pedicled Flap for Orbital Floor Defect Reconstruction

Coronoid-Temporalis Pedicled Flap for Orbital Floor Defect Reconstruction

Published on: December 5, 2025

Related Experiment Videos

Last Updated: May 27, 2026

A Morphometric and Cellular Analysis Method for the Murine Mandibular Condyle

A Morphometric and Cellular Analysis Method for the Murine Mandibular Condyle

Published on: January 11, 2018

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

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

Published on: September 8, 2023

Coronoid-Temporalis Pedicled Flap for Orbital Floor Defect Reconstruction

Coronoid-Temporalis Pedicled Flap for Orbital Floor Defect Reconstruction

Published on: December 5, 2025

Area of Science:

Oral and Maxillofacial Surgery
Anatomic Variations
Pathology

Background:

Coronoid process hyperplasia is an uncommon condition causing mandibular hypomobility.
It can be associated with temporalis muscle hyperactivity, trauma, neoplasia, or be idiopathic.
Jacob's disease, characterized by coronoid process enlargement and pseudojoint formation with the zygomatic arch, typically results from osteochondroma.

Observation:

This report presents a unique case of an accessory mandibular condyle.
The accessory condyle was found to be non-neoplastic.
It was located at the coronoid process and articulated with the zygoma.

Findings:

The study identifies a non-neoplastic accessory mandibular condyle at the coronoid process.
This accessory condyle formed an articulation with the zygomatic arch.
This represents a previously unreported anatomical variation in the context of Jacob's disease.

Implications:

This finding expands the differential diagnosis for Jacob's disease and coronoid process hyperplasia.
It highlights the possibility of non-neoplastic etiologies for pseudojoint formation.
Understanding such rare anatomical variations is crucial for accurate diagnosis and surgical planning in maxillofacial surgery.