Haversian canal

Examples of Haversian canal in the following topics:

• Supply of Blood and Nerves to Bone

  • Blood is supplied to mature compact bone through the Haversian canal.
  • The canals and the surrounding lamellae (8–15) are called a Haversian system or an osteon.
  • A Haversian canal generally contains one or two capillaries and nerve fibers.
  • Volkmann's canals are channels that assist with blood and nerve supply from the periosteum to the Haversian canal.
  • The Haversian canals surround blood vessels and nerve cells throughout the bone.

• Microscopic Anatomy of Bone

  • The basic microscopic unit of bone is an osteon (or Haversian system).
  • Each osteon consists of a lamellae of compact bone tissue that surround a central canal (Haversian canal).
  • The Haversian canal contains the bone's blood supplies.

• Connective Tissues: Bone, Adipose, and Blood

  • A blood vessel and a nerve are found in the center of the osteon within a long opening called the Haversian canal, with radiating circles of compact bone around it known as lamellae.
  • Blood vessels, nerves, and lymphatic vessels are found in the central Haversian canal.
  • Rings of lamellae surround the Haversian canal.

• Bone

  • Compact bone tissue consists of units called osteons or Haversian systems.
  • Each osteon consists of lamellae, layers of compact matrix that surround a central canal (the Haversian or osteonic canal), which contains the bone's blood vessels and nerve fibers.
  • Compact bone tissue consists of osteons that are aligned parallel to the long axis of the bone and the Haversian canal that contains the bone's blood vessels and nerve fibers.

• Development of the Skeleton

  • These layers subsequently encroach upon the mesh, under the periosteum, and around the larger vascular channels that become the Haversian canals, thickening and developing the bones.

• Canals

• Transportation: Roads, Canals, and Railroads

  • In 1808, a government-sponsored Report on the Subject of Public Roads and Canals suggested that the federal government should fund the construction of interstate turnpikes and canals.
  • Among the most important of these canals was the Erie Canal.
  • The success of the Erie Canal led to a proliferation of smaller canal routes in the region.
  • Most of the canal work was done by Irish immigrants who had previously worked on the Erie Canal.
  • The Illinois and Michigan Canal was an important canal in the nineteenth century, but was rendered obsolete when new railroads replaced it.

• Impacted Cerumen

  • Earwax, or cerumen, is a yellowish waxy substance secreted in the ear canal which can affect hearing if produced excessively.
  • Earwax, also known by the medical term cerumen, is a yellowish waxy substance secreted in the ear canal of humans and other mammals.
  • Excessive earwax may impede the passage of sound in the ear canal, causing conductive hearing loss.
  • Cerumen is produced in the outer third of the cartilaginous portion of the human ear canal.
  • A curette method is more likely to be used by otolaryngologists when the ear canal is partially occluded and the material is not adhering to the skin of the ear canal.

• Root Canal Therapy

  • This set of procedures is commonly referred to as a "root canal" .
  • This procedure is known as root canal therapy.
  • The alternatives to root canal therapy include no treatment, tooth extraction, or the 3Mix-MP procedure.
  • Recent studies indicate that substances commonly used to clean the root canal space incompletely sterilize the canal.
  • However, a properly restored tooth following root canal therapy yields long-term success rates near 97%.

• Balance and Determining Equilibrium

  • Head position is sensed by the utricle and saccule, whereas head movement is sensed by the semicircular canals.
  • The semicircular canals are three ring-like extensions of the vestibule.
  • The semicircular canals contain several ampullae, with some oriented horizontally and others oriented vertically.
  • Rotational movement of the head is encoded by the hair cells in the base of the semicircular canals.
  • The movement of two canals within a plane results in information about the direction in which the head is moving, and activation of all six canals can give a very precise indication of head movement in three dimensions.