A trabecula (plural trabeculae, from Latin for “small beam”) is a small, often microscopic, tissue element in the form of a small beam, strut or rod that supports or anchors a framework of parts within a body or organ.
What is an trabeculae?
Definition of trabecula
1 : a small bar, rod, bundle of fibers, or septal membrane in the framework of a body organ or part. 2 : a fold, ridge, or bar projecting into or extending from a plant part especially : a row of cells bridging an intercellular space.
Where do you find trabeculae?
Trabeculae are the thin columns and plates of bone that create a spongy structure in a cancellous bone, which is located at the ends of long bones and in the pelvis, ribs, skull, and vertebrae.
Does cartilage have trabeculae?
Trabecular cartilage | |
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Latin | trabecula cranii |
Anatomical terminology |
Is trabecular bone lamellar?
A single trabecula is composed of lamellar tissue with osteocytes lying in lacunae with a network of canaliculi similar to that of the cortical tissue.
What is a trabecular pattern?
The arrangement of the trabeculae of bone in relation to marrow spaces.
What makes trabecular bone?
Trabecular bone is a highly porous (typically 75–95%) form of bone tissue that is organized into a network of interconnected rods and plates called trabeculae which surround pores that are filled with bone marrow.
What is a trabeculae in anatomy and physiology?
example of bone cell
bone is termed cancellous or trabecular. In mature bone, trabeculae are arranged in an orderly pattern that provides continuous units of bony tissue aligned parallel with the lines of major compressive or tensile force.
What is the difference between cortical and trabecular bone?
Cortical, or compact, bone is found mainly in the shafts of long bones and accounts for roughly 80% of bone mass [1]. Trabecular bone is found in vertebrae and the ends of long bones and is, in contrast, a porous foam-like structure with voids filled with bone marrow.
Why is trabecular bone porous?
The porosity of bone is the volume fraction of bone which is not occupied by bone tissue. Cortical porosity is due to a complex network of intracortical canals and spaces, while trabecular porosity is due to the intertrabecular marrow spaces.
Is trabecular bone soft?
Trabecular bone tissue is a hierarchical, spongy, and porous material composed of hard and soft tissue components which can be found at the epiphyses and metaphyses of long bones and in the vertebral bodies (Fig.
Where is the Volkmann’s canal?
Volkmann’s canals, also known as perforating holes or channels, are anatomic arrangements in cortical bones. Volkmann’s canals are inside osteons. They interconnect the haversian canals with each other and the periosteum.
Is trabecular bone mineralized?
Trabecular bone quality includes both microstructural and intrinsic tissue mineralization properties. However, the tissue mineralization in individual trabeculae of different trabecular types and orientations has not yet been investigated.
What type of bone has trabeculae?
Spongy bone consists of plates (trabeculae) and bars of bone adjacent to small, irregular cavities that contain red bone marrow.
What is selaginella trabeculae?
The endodermis in Selaginella is unique and its cells are called trabeculae. These cells are highly elongated and span an air space which intervenes between the cortex and the stele.
What are Osteoprogenitor cells?
Introduction. Osteoprogenitor cells, also known as osteogenic cells, are stem cells located in the bone that play a prodigal role in bone repair and growth. These cells are the precursors to the more specialized bone cells (osteocytes and osteoblasts) and reside in the bone marrow.
What are the 3 types of lamellae?
- Circumferential lamellae.
- Concentric lamellae.
- Interstitial lamellae.
What is bundle bone?
Bundle bone is a histologic term for the portion of the bone of the alveolar process that surrounds teeth and into which the collagen fibers of the periodontal ligament are embedded. It can also be referred to as alveolar bone proper.
What does Trabeculated mean in medical terms?
That thickening of the bladder walls is called trabeculation. When your bladder walls get too thick, they lose the ability to expand and contract, making it hard for your body to expel urine. Bladder trabeculation can be caused by other health conditions, such as blood clots.
Is trabecular bone the same as spongy bone?
cancellous bone, also called trabecular bone or spongy bone, light, porous bone enclosing numerous large spaces that give a honeycombed or spongy appearance. The bone matrix, or framework, is organized into a three-dimensional latticework of bony processes, called trabeculae, arranged along lines of stress.
What are cancellous bones?
Cancellous bone is the meshwork of spongy tissue (trabeculae) of mature adult bone typically found at the core of vertebral bones in the spine and the ends of the long bones (such as the femur or thigh bone).
Is cartilage porous or non porous?
Cartilage is a non-porous tissue with a thick intercellular substance called the matrix. It is semi-transparent and elastic.
What is cancellous and cortical bone?
A Cortical and Cancellous Bone
Cortical bone is a dense tissue that contains less than 10% soft tissue. Cancellous or spongy bone is made up of trabecules shaped as plates or rods interspersed between bone marrow that represents more than 75% of the cancellous bone volume.
Are only found in cancellous bone?
Cancellous bone is found at the ends of long bones, as well as in the pelvic bones, ribs, skull, and the vertebrae in the spinal column. It is very porous and contains red bone marrow, where blood cells are made. It is weaker and easier to fracture than cortical bone, which makes up the shafts of long bones.
How are trabeculae aligned?
Wolff proposed that trabeculae align at 90 degrees angles (orthogonal). However, nonorthogonal alignment of trabeculae has been observed near many joints, including the proximal femur.
What fills the spaces of trabeculae?
The spaces between the trabecula are filled with active or inactive bone marrow. Since this bone has adipose tissue in the spaces, the bone marrow in this area was inactive. The osteocytes (o) of cancellous or spongy bone are also found in spaces called lacunae.
What is trabeculae in spleen?
The spleen is covered by a dense capsule, and there are connective tissue trabeculae, which provide internal support for the spleen, and carry the blood vessels into the spleen. … It shows how the artery has a lymphoid sheath surrounding the artery, as it enters the spleen, with aggregations of secondary lymphoid tissue.
Which are subclasses of bone?
The four principal types of bones are long, short, flat and irregular. Bones that are longer than they are wide are called long bones.
Does trabecular bone have collagen?
The third level of trabecular bone structure consists of the same entities as the third level of cortical bone structure, namely the collagen fibril-mineral composite.
What are two differences between cortical compact and trabecular spongy bone?
Spongy Bones | Compact Bones |
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They are made up of trabeculae | They are made up of osteons |
They fill the inner layer of most bones | They fill the outer layer of most bones |
Bone-marrow cavity absent | Bone-marrow cavity present in the centre |
What is the difference between trabeculae and the bone marrow cavity?
Spongy bone is sometimes called cancellous bone or trabecular bone. The outsides of all the bones of the body are covered with a layer of irregular dense connective tissue proper called the periosteum. … The medullary cavity, live the spaces in spongy bone, is filled with bone marrow.
Which bones undergo endochondral ossification?
Endochondral ossification is the process of bone development from hyaline cartilage. All of the bones of the body, except for the flat bones of the skull, mandible, and clavicles, are formed through endochondral ossification.
Does trabecular bone have Osteons?
Spongy bone tissue does not contain osteons. Instead, it consists of trabeculae, which are lamellae that are arranged as rods or plates. Red bone marrow is found between the trabuculae. Blood vessels within this tissue deliver nutrients to osteocytes and remove waste.
How is bone like a subway system?
How is bone like a subway system? it has a system of passageways which are like tiny tunnels, they are laid out both lengthwise and in concentric circles, crisscrossing like a subway system. blood vessels and nerves travel through these tiny tunnels. Describe ossification.
Does osteoporosis affect trabecular bone?
Trabecular bone is more active and is broken down and regenerated more quickly than cortical bone. Because of this, trabecular bone is more likely to be affected when the break down and regeneration of bone are out of balance in osteoporosis. Bone size grows throughout childhood and adolescence.
Does compact bone have Trabeculae?
Compact bone tissue is composed of osteons and forms the external layer of all bones. Spongy bone tissue is composed of trabeculae and forms the inner part of all bones.
Where do osteocytes live?
Osteocytes are most often described as terminally differentiated osteoblasts that reside in small pockets termed lacunae, located deep within mineralized bone.
What connects the Walkman Canal?
…of the cortex, are called Volkmann canals; Volkmann canals connect adjacent osteons and also connect the blood vessels of the Haversian canals with the periosteum, the tissue covering the bone’s outer surface.
What is the interstitial lamellae?
the interstitial lamellae (K) fill the spaces between osteons. the circumferential lamellae (L) run around the circumference of the bone. The inner circumferential lamellae are located on the inner side of the compact bone tissue and the outer circumferential lamellae are located on the outside.
What are lacunae in bone?
Bone. The lacunae are situated between the lamellae, and consist of a number of oblong spaces. … Each lacuna is occupied during life by a branched cell, termed an osteocyte, bone-cell or bone-corpuscle. Lacunae are connected to one another by small canals called canaliculi. A lacuna never contains more than one osteocyte …
What are the functional differences between an Osteocyte osteoblast and osteoclast?
Osteoblasts are responsible for the formation of bone whereas the osteoclasts are responsible for the breakdown of the bones. The coordinated actions of these two cells are required for the formation and resorption (breakdown) of bones.
Is Endochondral an ossification?
Endochondral ossification is the process by which the embryonic cartilaginous model of most bones contributes to longitudinal growth and is gradually replaced by bone.