lacuna

Examples of lacuna in the following topics:

• Postnatal Bone Growth

  • Zone of cell proliferation: Closer to the marrow cavity, chondrocytes in this region multiply and arrange themselves into longitudinal columns of flattened lacunae.
  • The walls of the matrix between the lacunae become very thin.
  • Minerals are deposited in the matrix between the columns of lacunae, but are not the permanent bone mineral deposits.
  • This acts as a temporary support for the cartilage that would otherwise be weakened due to the breakdown of the lacunae.
  • Zone of bone deposition (ossification): The walls between the lacunae break down and the chondrocytes die.

• Cartilage Growth

  • The chondroblasts then trap themselves in lacunae, small spaces that are no longer in contact with the newly created matrix and contain extracellular fluid.
  • Once damaged, cartilage has limited repair capabilities because chondrocytes are bound in lacunae and cannot migrate to damaged areas.

• Lumbar Plexus

  • The lateral femoral branch is purely sensory and pierces the vascular lacuna near the saphenous hiatus and supplies the skin below the inguinal ligament.
  • Medial to the anterior superior iliac spine, it leaves the pelvic area through the lateral muscular lacuna and enters the thigh by passing behind the lateral end of the inguinal ligament.
  • It exits the pelvis through the medial aspect of the muscular lacuna.

• Sinusoid Development

  • The invasion of endometrial sinusoids by the trophoblast allows maternal blood flow into the trophoblastic lacunae; this forms the uteroplacental circulation.

• Development of the Extraembryonic Coelom

  • As development progresses, small lacunae begin to form within the extraembryonic mesoderm which become larger and form the extraembryonic celom.

• Supply of Blood and Nerves to Bone

  • The Haversian canals also surround nerve cells throughout the bone and communicate with osteocytes in lacunae (spaces within the dense bone matrix that contain the living bone cells) through canaliculi.

• Embryonic and Fetal Bone Formation

• Bone Repair

  • The trabecular bone is first resorbed by osteoclasts, creating a shallow resorption pit known as Howship's lacuna, and then osteoblasts deposit compact bone within the resorption pit.

• Capacity of Different Tissues for Repair

  • The trabecular bone is first resorbed by osteoclasts, creating a shallow resorption pit known as a "Howship's lacuna. " Then osteoblasts deposit compact bone within the resorption pit.

• Structure, Type, and Location of Cartilage

  • They lie in spaces called lacunae with up to eight chondrocytes located in each.