A&p Ch.5-6 Skeletal & Muscular System

The longitudinal axis consists of the skull, vertebral column, and bony thorax, which includes ribs, sternum, and scapula. These structures provide essential support and protection for the central nervous system and vital organs.

Sutures are fibrous joints that connect the bones of the skull together, allowing for minimal movement and providing stability.

The correct identification of #7 and #23 are the external acoustic meatus and frontal bone respectively. The lateral skull refers to the side view of the skull, which would include these two structures.

The foramen magnum is located at the superior part of the skull, specifically when the top of the cranium is removed, and is not related to the inferior part of the cranium, the ear canal, or the base of the spine.

The paranasal sinuses are air-filled spaces within the bones of the face that help to lighten the skull, produce mucus, humidify and warm the air we breathe, and resonate sound.

The hyoid bone is a unique bone in the human body that serves as a movable base for the tongue and an attachment point for neck muscles involved in swallowing and speaking.

Fontanels are fibrous membranes in the skull, not related to parts of the inner ear, spinal vertebrae, or nasal bones.

The correct breakdown of vertebrae in the spine is 7 in the cervical section, 12 in the thoracic section, and 5 in the lumbar section. This structure supports different functions in the body based on their placement.

Intervertebral discs are made of pads of flexible fibrocartilage, not bone tissue, muscle fibers, or synovial fluid. These discs serve to cushion vertebrae and absorb shocks while allowing spine flexibility.

A comminuted fracture results in the bone breaking into many fragments, unlike the other incorrect answers which describe different types of bone injuries.

An impacted fracture occurs when broken bone ends are forced into each other, usually due to a direct impact or compression force. It is important to understand the different types of fractures to properly diagnose and treat the injury.

A greenstick fracture is when a bone breaks incompletely, usually seen in children whose bones are still flexible.

Reduction in the context of the question refers to the realignment of broken bone ends to promote proper healing. It is not related to increasing or decreasing size or value, or expelling waste products from the body.

Bone fracture healing involves several stages that include the formation of a hematoma, fibrocartilage callus, bony callus, and bone remodeling to achieve full recovery.

A lacuna is a term used in anatomy to refer to a small depression or space in bone or cartilage that is occupied by cells. It is an important structural component in the formation and maintenance of bone and cartilage tissue.

The periosteum is a fibrous connective tissue membrane that covers the surface of bones, providing protection and support for the bone structure.

Articular cartilage covers the external surface of epiphyses, which are the ends of long bones. It acts as a smooth layer that reduces friction and facilitates movement in joints during articulation.

The epiphyseal plate is responsible for lengthwise growth of long bones by secreting new bone tissue.

Ossification specifically refers to the process of bone formation where a hyaline cartilage model is covered with bone matrix by osteoblasts. The incorrect answers provided do not accurately describe the process of ossification.

During prenatal development, 9 vertebrae out of the total 33 fuse together to form the sacrum and coccyx, which are parts of the human spine. The sacrum is a triangular bone located below the lumbar vertebrae and above the coccyx, while the coccyx is commonly known as the tailbone. The fusion of these vertebrae helps to provide stability and support for the pelvic region.

Scoliosis is characterized by an abnormal lateral curvature of the spine, rather than being a type of cancer, infection, or genetic disorder.

Kyphosis is characterized by an abnormal, convex curvature of the spine, leading to a noticeable bulge at the upper back. The incorrect answers provided do not accurately describe kyphosis, making them the wrong choices.

The coccyx, also known as the tailbone, is formed from the fusion of 3 to 5 tiny, irregularly shaped vertebrae at the base of the vertebral column. It is often referred to as the human tailbone, though its actual function is to support the body when sitting and serve as an attachment point for various muscles and ligaments.

The bony thorax forms a protective, cone-shaped cage of slender bones around organs of the thoracic cavity, consisting of the sternum, ribs, and thoracic vertebrae.

The appendicular skeleton is composed of the bones that form the limbs (arms and legs), the pectoral girdle (shoulder bones), and the pelvic girdle (hip bones).

The pectoral girdle consists of the clavicle and scapula, which allow for free movement of the arms and shoulders. The humerus and radius are bones of the arm, the femur and tibia are bones of the leg, and the sternum and ribs are part of the rib cage and thoracic region.

The connection between the acromion and the clavicle laterally is referred to as the acromioclavicular joint, where the acromion connects with the clavicle. It is an important anatomical structure in the shoulder region.