Eye anatomy

The human eye is the organ which gives us the sense of sight, allowing us to observe and learn more about the surrounding world than we do with any of the other four senses.  We use our eyesreading, working,  writing a letter, driving a car,watching televisionand in countless other ways.The eye is a slightly asymmetrical globe, about an inch in diameter. The front part of the eye (the part you see in the mirror) includes: 1.The iris. 2.The cornea. 3.The pupil. 4.The sclera. 5.The conjunctiva. ...

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Cardiovascular system

Cardiovascular System:  The cardiovascular system includes the heart and the blood vessels. The heart pumps blood, and the blood vessels channel and deliver it throughout the body. Arteries carry blood filled with nutrients away from the heart to all parts of the body. The blood is sometimes compared to a river, but the arteries are more like a river in reverse. Arteries are thick-walled tubes with a circular covering of...

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Anatomy of the Shoulder

The two main bones of the shoulder are the humerus and the scapula (shoulder blade). The joint cavity is cushioned by articular cartilage covering the head of the humerus and face of the glenoid. The scapula extends up and around the shoulder joint at the rear to form a roof called the acromion, and around the shoulder joint at the front to form the coracoid process. Ligaments connect the bones of the shoulder, and tendons join the bones to surrounding muscles. The bicepstendon attaches the biceps muscle to the shoulder and helps to stabilize...

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Human anatomy nose

The visible part of the human nose is the protruding part of the face that bears the nostrils.  The shape of the nose is determined by the ethmoid bone and the nasal septum, which consists mostly of cartilage and which separates the nostrils.  On average the nose of a male is larger than that of a female. The nasal root is the top of the nose, forming an indentation at the suture where the nasal bones meet the frontal bon. ...

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Respiratory system

The respiratory system is the anatomical system of an organism that introduces respiratory gases to the interior and performs gas exchange. In humans and other mammals, the anatomical features of the respiratory system include airways, lungs, and the respiratory muscles. Molecules of oxygen and carbon dioxide are passively exchanged, by diffusion, between the gaseous external environment and the blood. Other animals, such as insects, have...

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The human brain is the center of the human nervous system.

The human brain is the center of the human nervous system.It has the same structure as the brains of other mammals,but is larger than expected on the basis of body size among other primates.Estimates for the number of neuronsin the human brain range from 80 to 120 billion.Most of the expansion comes from the cerebral cortex.Fig: ...

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Human anatomy

The human brain is the center of the human nervous system.It has the same structure as the brains of other mammals,but is larger than expected on the basis of body size among other primates.Estimates for the number of neuronsin the human brain range from 80 to 120 billion.Most of the expansion comes from the cerebral cortex, especially the frontal lobes,which are associated with executive functions such as self-control, planning, reasoning, and abstract thought.The portion of the cerebral cortex devoted to vision is also greatly enlarged in human...

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