Bio 255 Week 4 Questions and Answers

Bio 255 Week 4 Questions and Answers perforating canal runs ______ to the ling axis of the bone perpendicular central canal runs _____ to the long axis of the bone parallel what major structures run through the canals blood vessels, nerves, lymph nodes periosteum is located on the inner or outer surface of the bone? outer endosteum is located on the inner or outer surface of the bone? inner what connects the periosteum to compact bone? perforating fibers what is the major structural and functional unit that makes up spongey bone trabeculae what is the major structural and functional unit that makes up compact bone? osteons what gets made in red bone marrow? all blood cells (red, white, platelets) is red bone marrow in compact or spongy bone? spongy bone where are osteocytes (bone cells) located? lacunae Which bones of the neurocranium are paired? parietal and temporal Which bones of the neurocranium are not paired? frontal, occipital, sphenoid, ethmoid which bones of the face are paired? lacrimal, nasal, zygomatic, maxillary, inferior nasal concha, palatine which bones of the face are not paired? mandible, vomer which type of vertebra has the thickest body? lumbar ribs are attached to which type of vertebrae? thoracic vertebra What makes true ribs true? they articulate with both the vertebral column and the sternum What makes false ribs false? they articulate with the vertebral column, but attach to the cartilage of the rib directly superior to it What makes floating ribs "floating"? they only articulate with the vertebral column why do fetal skulls have fontanelles and unfused stutures? to allow growth of the brain and to compress during birth what is the suture that divides the parietal bones from the occipital bone? the lambdoidal suture what is the suture that divides the parietal bones from the temporal bones? the squamosal suture what suture divides the left and right parietal bones the sagittal suture