The human spinal cord is protected by the spinal column, which is made up of bones called vertebrae. Each vertebra consists of the spinous process, transverse process and body. The spinal cord passes through the vertebral foramen, the middle opening in the vertebrae.Know More
The spinal cord is a bundle of nerve fibers that transmits information between the brain and the peripheral nervous system. It is a conduit for motor information that travels down the spinal cord, a conduit for sensory information that travels up the spinal cord and a center to coordinate reflexes. The spinal cord consists of 31 segments that span approximately 43 centimeters in length in women and 45 centimeters in men. Two spinal nerves branch from each segment of the spinal cord.
Different spinal nerves perform different functions. Cranial spinal nerves transmit signals to the back of the head, neck, shoulders, arms, hands and diaphragm. The thoracic spinal nerves control the signals to the chest muscles and parts of the back and abdomen. Lumbar spinal nerves transmit signals to the lower parts of the abdomen, back and buttocks and parts of the leg. Finally, the sacral spinal nerves control the signals to the lower legs, thighs and feet.Learn More
The brain is protected by one of two main parts of the skull called the neurocranium, which actually consists of eight different bones. The neurocranium includes the frontal bone, two parietal bones, two temporal bones, occipital, sphenoid and ethmoid bones.Full Answer >
A spinal structure is a series of vertebrae that consists of oval-shaped bones that are attached to the bone structure. It is a T-shaped network of bones and is responsible for the upright posture of human beings. A spinal structure consists of the cervical spine, the thoracic spine, the lumbar spine or lower back, the lumbar segments, the sacral spine and the coccyx or tailbone.Full Answer >
The bones that make up the human skeleton comprise about 15 percent of the body weight. Thus, a 200-pound person has a bone weight of about 30 pounds.Full Answer >
Bones are connected to one another and held together by ligaments. About.com Sports Medicine says that ligaments are strong bands of tissue that hold bones in complete alignment, preventing the skeleton from being turned or twisted into unnatural, potentially damaging angles.Full Answer >