Sacrum - 1 vertebra Coccyx tailbone - 1 vertebra With the exception of the singular sacrum and coccyx, each vertebra is named for the first letter of its region and its position along the superior-inferior axis. For example, the most superior thoracic vertebra is called T1 and the most inferior is called T Ribs and Sternum The sternum, or breastbone, is a thin, knife-shaped bone located along the midline of the anterior side of the thoracic region of the skeleton. The sternum connects to the ribs by thin bands of cartilage called the costal cartilage.
SAQ, Introduction -- microscopy, cells, basic tissue types, blood cells. Requires Java and fast internet connection. Blood vessels Blood vessels are basically tubular organs found within other organs. Recall that an "organ" consists of two or more different tissue types "organized" to serve a larger function.
Larger blood vessels may even have smaller vessels within their walls the vasa vasorum. Histologically, blood vessels consist of concentric layers or "tunics" of different tissue types. The tunica intima is the inner lining, consisting of endothelium and a relatively thin layer of supporting connective tissue.
The tunica adventitia is the outer, fibrous connective tissue layer. Nervous tissue is generally inconspicuous in blood vessels but serves to regulate smooth muscle function and to mediate pain sensation. The composition of the wall varies quantitatively among these subcategories.
Arteries conduct blood away from the heart and have proportionately more smooth muscle and elastic tissue than veins of comparable size. Arteries are commonly sub-categorized into elastic arteries, muscular arteries, and arterioles. Veins return blood to the heart and have proportionately less smooth muscle and elastic tissue than arteries of comparable size.
Comparison of artery and vein. Click on an image for enlargement.
Capillaries and sinusoids communicate between arteries and veins. Their lining generally consists only of endothelium and underlying basement membrane. Note that capillaries are found in connective tissue or stroma in nearly every organ cartilage is an exception, an avascular connective tissue but are seldom noticable in routine histological sections.
Intima tunica intima The intima is the inner layer of a vessel. It consists of very thin lining of simple squamous endothelial cells supported by a similarly thin layer of connective tissue.
The integrity of the intima is critical, since damage can lead to atherosclerosis or clotting. In arteries a continuous layer of elastic tissuecalled the internal elastic lamina, forms the boundary between the intima and the media.
Endothelium The endothelium is a specialized form of mesenchymally-derived epithelial tissue. This simple squamous epithelium forms a thin, delicate lining of all blood vessels as well as the heart and the lymphatic system.
The endothelium is arguably the most significant feature of the vessel. Capillary endothelium may have closely associated pericytescells with contractile properties which might regulate capillary flow. Endothelial cytoplasm is inconspicuous in routine light microscopy.
Typically only the nuclei are visible, at the boundary between the lumen and the wall of a vessel.Human Anatomy Study Guide The Skeletal System: Chapter 6 Unit Objectives At the end of this unit, you should be able to 1) List the functions of the skeletal system. 2) Describe the anatomy of a long bone and identify its major internal and external features.
3) Contrast spongy bone and compact bone in terms of structure and function. The skeletal system includes all of the bones and joints in the body. Each bone is a complex living organ that is made up of many cells, protein fibers, and minerals.
List the 5 specific reasons we need the Skeletal System. Shape & support, allows movement, provides protection, makes red blood cells, and stores minerals.
8.) List 3 ways to keep our bones strong and healthy. Skeletal System Study Guide Author: himese Last modified by: D'Angelo, Lillian Created Date: 10/22/ PM. Chapter 5 The Skeletal System AXIAL SKELETON Skull 9. Using the key choices, identify the bones indicated by the following descrip- 77 tions.
Enter the appropriate term or letter in the answer blanks. 1. Forehead bone 2. Cheekbone 3. Lower jaw 4. Bridge of nose 5. Posterior part of hard palate 6.
Much of the lateral and superior cranium H p i 7. Welcome to attheheels.com, a free educational resource for learning about human anatomy and physiology. Explore the anatomy systems of the human body!
Teaching students about the urinary system can sometimes feel a little awkward! The games and activities in this lesson will help keep learning lighthearted while still ensuring that your students.