Human Anatomy — Skeletal System

Haversian Canal

A central canal in the osteon of compact bone, containing blood vessels, nerves, and lymphatics.

Bone Remodeling

The process by which bone tissue is continuously renewed through the resorption of old bone and the formation of new bone.

What is the primary function of red bone marrow?

Red bone marrow is responsible for the production of blood cells, including red blood cells, white blood cells, and platelets.

Periosteum

A dense layer of vascular connective tissue enveloping the bones except at the surfaces of the joints.

Endosteum

A thin vascular membrane of connective tissue that lines the inner surface of the bony tissue that forms the medullary cavity of long bones.

Articular Cartilage

A smooth, white tissue that covers the ends of bones where they come together to form joints, facilitating smooth movement.

Epiphyseal Plate

A hyaline cartilage plate in the metaphysis at each end of a long bone, where bone growth occurs in children and adolescents.

What is the role of the synovial fluid?

Synovial fluid lubricates joints to reduce friction during movement and provides nutrients to the articular cartilage.

Ligament

A fibrous connective tissue that connects bones to other bones, providing stability to joints.

Tendon

A fibrous connective tissue that connects muscle to bone, transmitting the force generated by muscle contraction to the skeleton.

Compact Bone

The dense, hard outer layer of bone tissue that provides strength and protection.

Spongy Bone

A lighter, porous type of bone tissue found at the ends of long bones and in the interiors of other bones, containing red bone marrow.

What is the main difference between a fibrous joint and a synovial joint?

Fibrous joints are immovable and connected by dense connective tissue, while synovial joints are freely movable and characterized by a synovial cavity filled with fluid.

Foramen Magnum

A large opening in the occipital bone of the skull through which the spinal cord passes to connect with the brain.

How does the structure of a long bone support its function?

The long bone's diaphysis is strong and hollow, providing support and weight-bearing capacity, while the epiphyses are spongy with red marrow, aiding in the production of blood cells.

What are the components of the vertebral column?

The vertebral column consists of 33 vertebrae: 7 cervical, 12 thoracic, 5 lumbar, 5 sacral (fused), and 4 coccygeal (fused).

Primary Curvatures

The thoracic and sacral curvatures of the vertebral column, present from birth, and concave anteriorly.

Secondary Curvatures

The cervical and lumbar curvatures of the vertebral column, which develop after birth and are convex anteriorly.

What is the role of the intervertebral discs?

Intervertebral discs act as shock absorbers between vertebrae and allow limited movement of the spine, contributing to its flexibility.

Fontanelles

Soft spots on a baby's skull where the bones have not yet fused, allowing for growth of the brain and skull in infancy.

What is a sesamoid bone?

A small, round bone embedded within a tendon, such as the patella, that protects the tendon and increases its mechanical effect.

What is the significance of the sternum?

The sternum is a flat bone located in the center of the chest, providing attachment for the ribs via costal cartilages and forming the anterior part of the rib cage, protecting vital organs.

What structural differences exist between male and female pelves?

The female pelvis is wider and shallower with a larger pelvic inlet and outlet to facilitate childbirth, while the male pelvis is narrower and deeper.

What is the function of the hyoid bone?

The hyoid bone supports the tongue and is an attachment site for muscles associated with swallowing and speech.

What are the types of bone cells?

Bone cells include osteoblasts (form new bone), osteocytes (maintain bone tissue), osteoclasts (resorb bone), and osteoprogenitor cells (differentiate into osteoblasts).

What is the main mineral stored in bones?

Calcium is the primary mineral stored in bones, essential for maintaining bone strength and density, as well as for various bodily functions.

What is Wolff's Law?

Wolff's Law states that bone in a healthy person will adapt to the loads under which it is placed, becoming stronger with increased loading and weaker with decreased loading.

What is the anatomical position?

The anatomical position is a standard position of the body used as a reference in anatomy: standing upright, arms at the sides, palms facing forward, and feet together.

What is the function of the clavicle?

The clavicle, or collarbone, serves as a strut between the shoulder blade and the sternum, providing structural support and allowing for arm movement.

What is the role of the acromion?

The acromion is an extension of the scapula that forms the highest point of the shoulder, providing attachment for muscles and forming part of the shoulder joint.

What is the significance of the glenoid cavity?

The glenoid cavity is a shallow depression on the scapula that articulates with the head of the humerus, forming the shoulder joint and allowing for a wide range of motion.

What is the function of the fibula?

The fibula is a bone of the lower leg that provides muscle attachment and forms the lateral part of the ankle joint, but it bears little weight.

What is the function of the patella?

The patella, or kneecap, protects the knee joint and increases the leverage of the quadriceps tendon, enhancing the knee's strength and efficiency during movement.

What are the functions of the skeletal system?

The skeletal system provides structural support, protection of internal organs, facilitation of movement, storage of minerals, and production of blood cells.