| A | B |
|---|
| latissimus dorsi | broad, flat muscle covering the middle and lower back assists in moving the shoulders downward |
| pectoralis major & minor | muscles of the chest that assist the swinging movements of the arm |
| serratus anterior | muscle of the chest that assists in breathing and in raising the arm. |
| trapezius | muscle that covers the back of the neck and upper and middle region of the back;rotates and controls swinging movements of the arm. |
| biceps | muscle that produces the contour of the front and inner side of the upper arm; they lift the forearm, flex the elbow and turn the palms outward |
| deltoid | large, triangular muscle that covers the shoulder joint and allows the arm to extend outward and to the side of the body |
| tricep | large muscle that covers the entire back of the upper arm and extends the forearm |
| extensors | muscles that straighten the wrist, hand and fingers to form a straight line |
| flexors | extensor muscles of the wrist, involved in bending the wrist |
| pronators | muscles that turn the hand inward so the the palm faces downward |
| supinator | muscle that rotates the radius outward and the palm upward |
| the nervous system | responsible for coordinating all the activities that are performed both inside and outside of the body. |
| 100 billion plus | number of nerve cells in the body. |
| neurons | nerve cells |
| brain, spinal cord and spinal nerves and cranial nerves | the central nervous system |
| central nervous system | aka. cerebrospinal system |
| peripheral nervous system | connects the outer parts of the body to the cns |
| autonomic nervous system | controls the involuntary muscles. |
| the brain | controls sensations, muscles, glandular activity and the power to think and feel. |
| the spinal cord | originates in the brain and extends down to the lower extremities. |
| 31 | pairs of spinal nerves |
| 44 - 48 ounces | weight of the brain |
| dendrite | nerve fiber, receives impulses from other neurons |
| axon | sends impulses away from the cell body |
| nerves | whitish cords through which impulses are transmitted. Originate in the brain |
| sensory/afferent nerves | carry impulses/messages from the sense organs to the brain |
| motor/efferent nerves | carry impulses from the brain to the muscles |
| reflex | automatic nerve reaction to a stimulus - think hot object and pulling your hand away when you touch it. |
