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Vertebrae are the 33 individual bones that interlock with each other to form the spinal column. The vertebrae are numbered and divided into regions: cervical, thoracic, lumbar, sacrum, and coccyx Fig. Only the top 24 bones are moveable; the vertebrae of the sacrum and coccyx are fused. The vertebrae in each region have unique features that help them perform their main functions. Cervical neck - the main function of the cervical spine is to support the weight of the head about 10 pounds.
The seven cervical vertebrae are numbered C1 to C7. The neck has the greatest range of motion because of two specialized vertebrae that connect to the skull. The first vertebra C1 is the ring-shaped atlas that connects directly to the skull. The second vertebra C2 is the peg-shaped axis, which has a projection called the odontoid, that the atlas pivots around.
Thoracic mid back - the main function of the thoracic spine is to hold the rib cage and protect the heart and lungs.
The twelve thoracic vertebrae are numbered T1 to T The range of motion in the thoracic spine is limited. Lumbar low back - the main function of the lumbar spine is to bear the weight of the body. The five lumbar vertebrae are numbered L1 to L5. These vertebrae are much larger in size to absorb the stress of lifting and carrying heavy objects.
Sacrum - the main function of the sacrum is to connect the spine to the hip bones iliac. There are five sacral vertebrae, which are fused together. Together with the iliac bones, they form a ring called the pelvic girdle. Coccyx region - the four fused bones of the coccyx or tailbone provide attachment for ligaments and muscles of the pelvic floor. While vertebrae have unique regional features, every vertebra has three functional parts Fig.
Each vertebra in your spine is separated and cushioned by an intervertebral disc, which keeps the bones from rubbing together. Discs are designed like a radial car tire. The outer ring, called the annulus, has crisscrossing fibrous bands, much like a tire tread. These bands attach between the bodies of each vertebra.
Inside the disc is a gel-filled center called the nucleus, much like a tire tube Fig. Discs function like coiled springs. The crisscrossing fibers of the annulus pull the vertebral bones together against the elastic resistance of the gel-filled nucleus. The nucleus acts like a ball bearing when you move, allowing the vertebral bodies to roll over the incompressible gel. Enable flexible motion. Romeo Halyavin Pundit.
How many bones are in spine? Ihsan Tsapin Pundit. Where is the 6th vertebrae located? The C6 vertebra is the sixth cervical vertebra of the spine. It is found in the base of the neck between the C5 and the last cervical vertebra , C7. Andresa Hornbostel Pundit. What is the only bone in your head that can move? Your lower jawbone is the only bone in your head you can move.
It opens and closes to let you talk and chew food. Your skull is pretty cool, but it's changed since you were a baby. All babies are born with spaces between the bones in their skulls.
Adjou Grimaldo Teacher. How many bones are in your body? Arritokieta Mamani Teacher. What is between the vertebrae? An intervertebral disc or intervertebral fibrocartilage lies between adjacent vertebrae in the vertebral column. Each disc forms a fibrocartilaginous joint a symphysis , to allow slight movement of the vertebrae , to act as a ligament to hold the vertebrae together, and to function as a shock absorber for the spine. Andreza Gorchilin Teacher. What is the bone at the top of your spine?
Salas Winkelhane Teacher. How many bones are in your skull? The human skull is generally considered to consist of twenty - two bones — eight cranial bones and fourteen facial skeleton bones.
T3: Lungs, bronchial tubes, pleura, chest, breast, and heart. T4: Gallbladder, common duct, heart, lungs, and bronchial tubes. T5: Liver, solar plexus, circulation general , heart, oesophagus, and stomach. T6: Stomach, oesophagus, peritoneum, liver, and duodenum. T7: Kidneys, appendix, testes, ovaries, uterus, adrenal cortex, spleen, pancreas, and large intestine. T8: Spleen, stomach, liver, pancreas, gallbladder, adrenal cortex, small intestine, and pyloric valve.
T9: Adrenal cortex, pancreas, spleen, gallbladder, ovaries, uterus, and small intestine. T Kidneys, appendix, testes, ovaries, uterus, adrenal cortex, spleen, pancreas, and large intestine. T Kidneys, ureters, large intestine, urinary bladder, adrenal medulla, adrenal cortex, uterus, ovaries, and ileocecal valve.
T Small intestine, lymph circulation, large intestine, urinary bladder, uterus, kidneys, and ileocecal valve. L2: Appendix, abdomen, upper leg, and urinary bladder. L3: Sex organs, uterus, bladder, knee, prostate, and large intestine. Intervertebral discs are made of an outer shell known as the annulus fibrosus and a soft, pulpy region known as the nucleus pulposus in the middle.
The vertebrae of the spine align so that their vertebral canals form a hollow, bony tube to protect the spinal cord from external damage and infection. Between the vertebrae are small spaces known as intervertebral canals that allow spinal nerves to exit the spinal cord and connect to the various regions of the body.
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