Does spongy bone have lacunae?

Like compact bone, spongy bone, also known as cancellous bone, contains osteocytes housed in lacunae, but they are not arranged in concentric circles. Instead, the lacunae and osteocytes are found in a lattice-like network of matrix spikes called trabeculae (singular = trabecula) (Figure 7).

What are circumferential lamellae?

Circumferential Lamellae – Layers of bone matrix that go all the way around the bone. Spongy Bone. Trabeculae arranged along stress lines. Irregularly arranged lamellae and osteocytes.

What is the structure of lacunae?

The lacunae are situated between the lamellae, and consist of a number of oblong spaces. In an ordinary microscopic section, viewed by transmitted light, they appear as fusiform opaque spots. Each lacuna is occupied during life by a branched cell, termed an osteocyte, bone-cell or bone-corpuscle.

What are lacunae in compact bone?

Compact Bone Between the rings of matrix, the bone cells (osteocytes) are located in spaces called lacunae. The osteonic canals contain blood vessels that are parallel to the long axis of the bone. These blood vessels interconnect, by way of perforating canals, with vessels on the surface of the bone.

What is the purpose of lacunae?

Lacunae – Function The primary function of lacuna in bone or cartilage is to provide housing to the cells it contains and keeps the enclosed cells alive and functional. In bones, lacunae encase osteocytes; in cartilage, lacunae enclose chondrocytes.

What is the difference between lamellae and lacunae?

The lamellae are the concentric circles around the Haversian canal; they are a bone matrix formed from calcium, phosphorus salts and fibres. The lacunae are small spaces in the lamellae which provide an area for bone cells or osteocytes. This is the key difference between lamellae and lacunae.

Is lamellae present in cartilage?

Cartilage and Bone: Types of mature bone The osteocytes sit in their lacunae in concentric rings around a central Haversian canal (which runs longitudinally). The osteocytes are arranged in concentric rings of bone matrix called lamellae (little plates), and their processes run in interconnecting canaliculi.

What is the weakest type of cartilage?

Hyaline cartilage appears slightly glassy under a microscope. This cartilage type has many thin collagen fibers that help to give it strength. However, hyaline cartilage is considered the weakest of the three cartilage types.

How is ossification treated?

Usually, treatment will include gentle range of motion of the joints and some physical therapy. Your doctor may also prescribe medications to slow down or stop the abnormal growth of bone. When HO severely affects your movement or causes excruciating pain, surgery may be needed.

Which is the most common type of ossification?

Endochondral ossification involves the replacement of hyaline cartilage with bony tissue. Most of the bones of the skeleton are formed in this manner. These bones are called endochondral bones.

What are bone cavities called?

FMA. 83698. Anatomical terminology. The medullary cavity (medulla, innermost part) is the central cavity of bone shafts where red bone marrow and/or yellow bone marrow (adipose tissue) is stored; hence, the medullary cavity is also known as the marrow cavity.

What is the difference between the lacunae and the lamellae?

The lamellae are the concentric circles around the Haversian canal; they are a bone matrix formed from calcium, phosphorus salts and fibres. The lacunae are small spaces in the lamellae which provide an area for bone cells or osteocytes. This is the key difference between lamellae and lacunae.

How are osteocytes encased in the lacunae?

Osteocytes are encased in these small lacunae. The cellular, cytoplasmic extensions of osteocytes called canaliculi connect the osteocyte with the bone matrix. These canaliculi facilitate the transfer of substances including nutrients and waste products from osteocytes to the external environment via diffusion.

Which is the second most common lacunar syndrome?

Ataxic hemiparesis. This is the second most common lacunar syndrome and usually occurs with infarction of the posterior limb of the internal capsule, basis pontis, or corona radiata.

What are the different types of lacunar infarcts?

Most lacunar infarcts are clinically silent, but repeated episodes are associated with vascular dementia. Symptomatic patients may present with lacunar stroke syndrome (LACS) , one of five distinct syndromes. Lacunar infarcts, by definition, are caused by occlusion small penetrating end-arteries and must be smaller than 15 mm.