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Accessory Bones Main

From WikiSM

Description

Name

  • Accessory Bone
  • Ossicle
  • Sesamoid

General

  • This page refers to the accessory ossicles and sesamoids of the body
  • Generally can be seen on plain radiographs, however some are better seen on cross sectional imaging
  • Note we will try to summarize as many as we can, but there are many that are rarely mentioned or discussed in the literature with little to no published description or images

Terminology

  • Ossicle: accessory bone that is usually a normal variant with no known function
  • Sesamoid: small flat bone usually embedded in a tendon or joint capsule

Accessory Bones

Radiographic (A) and Illustration (B) of Os Acromiale[1]
The cervical vertebral levels have been labeled in yellow. The level at which the asymmetrical cervical ribs exist is labeled in orange/blue. The first thoracic vertebral transverse processes are labeled in green.[2]
Os Fabella
Normal navicular (left) and accessory navicular (right)[3]

Accessory Bones of the Head and Neck

Accessory Bones of the Shoulder

  • Os Acromiale
  • Os subacromiale
  • Os infraglenoidale
  • Os supraspinatum
  • Os scapulare
  • Os coracoideum

Accessory Bones of the Elbow

Accessory Bones of the Hand and Wrist

Accessory Bones of the Thorax

Accessory Bones of the Spine

Accessory Bones of the Hip

Accessory Bones of the Knee

Accessory Bones of the Foot and Ankle

See Also

References

  1. ↑ Image courtesy of sportsmd.com
  2. ↑ Case courtesy of Tom Molyneux, Radiopaedia.org, rID: 192172
  3. ↑ Image courtesy of https://footeducation.com/
Created by:
John Kiel on 25 April 2025 22:24:51
Authors:
Last edited:
2 May 2025 17:25:24
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