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.

• Development of the Skeleton

  • Subsequently successive layers of bony tissue are deposited under the periosteum and around the larger vascular channels that become the Haversian canals, so that the bone increases much in thickness.

• 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%.

• Ventricles

  • This system is continuous with the central canal of the spinal cord.
  • The structures of the ventricular system are embryologically derived from the center of the neural tube (the neural canal).
  • As the future brain stem aspect of the primitive neural tube develops, the neural canal expands dorsally and laterally, creating the fourth ventricle.  
  • The cerebral aqueduct is formed from the part of the neural canal that does not expand and remains the same at the level of the midbrain superior to the fourth ventricle.
  • The fourth ventricle narrows at the obex, where the fourth ventricle narrows to become the central canal in the caudal medulla.

• Orbits

  • To the rear of the orbit, the optic foramen opens into the optical canal through which the optic nerve and ophthalmic artery pass.
  • The lacrimal and ethmoid bones contribute to the medial wall of the orbit and also to the medial wall of the orbital canal.
  • Finally, the sphenoid bone forms the posterior wall of the orbit and also contributes to the formation of the optic canal.

• Perineum

  • Ischioanal fossa – a fat-filled space at the lateral sides of the anal canal.
  • It is bounded laterally by obturator internus muscle, medially by pelvic diaphragm and the anal canal.
  • Pudendal canal – contains internal pudendal artery and the pudendal nerve.

• Inguinal Hernia

  • An inguinal hernia is a protrusion of abdominal-cavity contents through the inguinal canal.
  • An inguinal hernia is a protrusion of abdominal-cavity contents through the inguinal canal .
  • Direct inguinal hernias occur medial to the inferior epigastric vessels when abdominal contents herniate through a weak spot in the fascia of the posterior wall of the inguinal canal, which is formed by the transversalis fascia.
  • As a result, the possibility for hernias through the inguinal canal in males is much greater because they have a larger opening and therefore a much weaker wall for the intestines to protrude through.
  • The larger size of their inguinal canal, which transmitted the testicle and accommodates the structures of the spermatic cord, might be one reason why men are 25 times more likely to have an inguinal hernia than women.

• Vestibulocochlear (VIII) Nerve

  • Three of these are the cristae, located in the ampullae of the semicircular canals.
  • An illustration of the inner ear showing its semicircular canal, hair cells, ampulla, cupula, vestibular nerve, and fluid.