What is the main structural unit of spongy bone?

What is the main structural unit of spongy bone?

Whereas compact bone tissue forms the outer layer of all bones, spongy bone or cancellous bone forms the inner layer of all bones. Spongy bone tissue does not contain osteons that constitute compact bone tissue. Instead, it consists of trabeculae, which are lamellae that are arranged as rods or plates.

What are the units of spongy bone?

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 6.13).

What is the main structural unit of compact bone?

Mature compact bone is lamellar, or layered, in structure. It is permeated by an elaborate system of interconnecting vascular canals, the haversian systems, which contain the blood supply for the osteocytes; the bone is arranged in concentric layers around those canals, forming structural units called osteons.

What is the structure of the tubular bone?

The diaphysis is the tubular shaft that runs between the proximal and distal ends of the bone. The hollow region in the diaphysis is called the medullary cavity, which is filled with yellow marrow. The walls of the diaphysis are composed of dense and hard compact bone.

What are the two basic types of bone tissue?

There are two types of bone tissue: compact and spongy. The names imply that the two types differ in density, or how tightly the tissue is packed together. There are three types of cells that contribute to bone homeostasis.

What is the functional unit of a bone?

The osteon or haversian system /həˈvɜːr. ʒən/ (named for Clopton Havers) is the fundamental functional unit of much compact bone.

What is the structure and function of spongy bone?

Spongy (cancellous) bone is lighter and less dense than compact bone. Spongy bone consists of plates (trabeculae) and bars of bone adjacent to small, irregular cavities that contain red bone marrow. The canaliculi connect to the adjacent cavities, instead of a central haversian canal, to receive their blood supply.

What is the structural unit of bone?

Osteon, the chief structural unit of compact (cortical) bone, consisting of concentric bone layers called lamellae, which surround a long hollow passageway, the Haversian canal (named for Clopton Havers, a 17th-century English physician).

What are the major structures of bone?

Bone tissues include compact bone, spongy bone, bone marrow, and periosteum.

What are the two types of bone and what are their features?

Compact (cortical) bone: A hard outer layer that is dense, strong, and durable. It makes up around 80 percent of adult bone mass. 2. Cancellous (trabecular or spongy) bone: This consists of a network of trabeculae or rod-like structures.

What makes up the inner space of the spongy bone?

Spongy bone contains large marrow spaces defined by shelves and spicules of bone. The inner space is lined by osteoblasts and osteoclasts (called the endosteum).

What’s the difference between compact and spongy bone?

While compact bone is denser and has fewer open spaces, spongy bone is ideal for making and storing bone marrow within the lattice-like trabeculae network. Compact bone stores yellow bone marrow, which is composed primarily of fat, in its medullary cavity.

What is the function of spongy bone in bone marrow?

Functions of Spongy Bone Storage of Bone Marrow Bone marrow, also called myeloid tissue, is formed when the trabecular matrix crowds blood vessels together and they condense. While compact bone is denser and has fewer open spaces, spongy bone is ideal for making and storing bone marrow within the lattice-like trabeculae network.

How is the structure of the kidneys explained?

Kidney Structure. The bean-shaped kidneys have an outer convex side and an inner concave side called the renal hilus, where the renal artery, vein, and ureter are found. A thin connective tissue called the renal capsule surrounds each kidney. This capsule maintains the kidneys’ shape and protects the inner tissues.