System Structure: Musculoskeletal - Massage and Bodywork Licensing Examination Mblex
- What is a tendon in the musculoskeletal system?
- Dense connective tissue connecting muscle to bone. Tendons transmit muscular forces to bones, enabling movement by providing strong, flexible connections resistant to tensile stress.
- Identify the axial skeleton components by name: what structures does it include?
- Skull, vertebral column, ribs, and sternum. The axial skeleton forms the central axis, protecting the brain, spinal cord, and thoracic organs while supporting posture.
- What is the diaphysis of a long bone?
- The shaft of a long bone. As the main cylindrical portion, it provides structural support and houses the medullary cavity for marrow storage.
- What is an antagonist muscle during a specific joint action?
- A muscle that opposes or reverses the movement. Antagonists provide controlled resistance, ensuring smooth motion and preventing overstretching by relaxing reciprocally.
- What is the epiphysis of a long bone?
- The expanded end of a long bone. It forms the joint surface and contains spongy bone for shock absorption and nutrient distribution in long bones.
- What is the prime mover (agonist) during a specific joint action?
- The muscle primarily responsible for producing the movement. The agonist initiates and sustains the desired action by generating the primary contractile force at the joint.
- What type of bone is a vertebra classified as by shape?
- Irregular bone. Vertebrae's complex shapes, including processes and facets, classify them as irregular to accommodate spinal functions like flexibility and protection.
- What is the endosteum, and where is it located in a bone?
- Membrane lining medullary cavity and internal bone surfaces. It facilitates bone remodeling and repair by containing osteoprogenitor cells along the inner surfaces of compact and spongy bone.
- What is a synergist muscle during a specific joint action?
- A muscle that assists the prime mover or stabilizes a joint. Synergists enhance efficiency by aiding the agonist's force or neutralizing unwanted actions to maintain joint stability.
- What is the primary function of the musculoskeletal system in the human body?
- Support, movement, protection, posture, and heat production. These functions collectively enable the body to maintain structure, facilitate locomotion, shield vital organs, uphold alignment, and generate warmth through muscle activity.
- What type of bone is the femur classified as by shape?
- Long bone. The femur's elongated shaft and expanded ends typify long bones, which provide leverage and support for major movements.
- Identify the appendicular skeleton components by name: what structures does it include?
- Upper/lower limbs plus pectoral and pelvic girdles. The appendicular skeleton facilitates mobility and manipulation by attaching limbs to the axial skeleton via girdles.
- What is the medullary cavity, and in which bones is it most prominent?
- Central marrow cavity; most prominent in long bone diaphyses. It stores yellow marrow for fat and can convert to red marrow for blood cell production, with prominence in long bones due to their length.
- What are the three major categories of joints based on structure?
- Fibrous, cartilaginous, and synovial joints. Classification by connective tissue type determines joint mobility, from immovable fibrous to freely movable synovial.
- What is a ligament in the musculoskeletal system?
- Dense connective tissue connecting bone to bone. Ligaments stabilize joints by limiting excessive movement while allowing controlled articulation between skeletal elements.
- What is the anatomical definition of a muscle insertion?
- Distal or more movable attachment of a muscle. The insertion moves toward the origin during contraction, enabling the muscle to produce directed force and joint motion.
- What are the four major types of bone classified by shape?
- Long, short, flat, and irregular bones. Bones are categorized by their morphology to reflect differences in function, such as support in long bones or protection in flat bones.
- Which joint type is freely movable and characterized by a synovial cavity?
- Synovial joint. Synovial joints allow extensive range of motion due to their fluid-filled cavity and lack of direct fibrous or cartilaginous union.
- What is synovial fluid, and what is its primary function in a synovial joint?
- Lubricating fluid that reduces friction and nourishes articular cartilage. Secreted by the synovial membrane, it provides low-friction lubrication and delivers nutrients to avascular cartilage in the joint capsule.
- What is a bursa, and what is its primary mechanical role near joints?
- Fluid-filled sac that reduces friction between tissues. Bursae cushion and facilitate smooth gliding of muscles, tendons, and ligaments over bony prominences during joint motion.
- What type of bone is the scapula classified as by shape?
- Flat bone. The scapula's broad, thin structure exemplifies flat bones, which offer protection and extensive muscle attachment sites.
- What is articular cartilage, and what is its main purpose at synovial joints?
- Hyaline cartilage reducing friction and absorbing shock at joint surfaces. Composed of hyaline cartilage, it minimizes wear on bone ends during movement and distributes compressive forces at synovial joints.
- What is the anatomical definition of a muscle origin?
- Proximal or more fixed attachment of a muscle. The origin serves as the stable anchor point, allowing the muscle to exert force toward the more mobile insertion during contraction.
- What is the structural difference between compact bone and spongy bone?
- Compact is dense; spongy is trabecular with marrow spaces. This distinction allows compact bone to provide strength and spongy bone to reduce weight while housing marrow for hematopoiesis.
- What is the periosteum, and where is it located on a bone?
- Fibrous membrane covering outer bone surface (except articular areas). It anchors tendons and ligaments while supplying osteoblasts for bone growth and repair via its vascular and nervous components.