1. I think sight is the most important sense of the human body. Without your sight you could not survive on your own because you could not drive to get food or other necessary items to survive. I think you would also be very lonely without your sight because you couldn't see any one or any thing else or their expressions.
2. Touch
3. Smell
4. Taste
5. Hearing
Wednesday, April 8, 2009
Structure of the Ear
The human ear consists of three sections: the outer ear, the middle ear, and the inner ear. The outer ear includes the auricle (pinna), the visible part of the ear that is attached to the side of the head, and the waxy, dirt-trapping auditory canal. The framework of the auricle consists of a single piece of yellow fibrocartilage with a complicated relief on the anterior, concave side and a fairly smooth configuration on the posterior, convex side. The outer ear consists of an ear flap and an approximately 2-cm long ear canal. The tympanic membrane (eardrum) separates the external ear from the middle ear, an air-filled cavity. The eardrum is a very durable and tightly stretched membrane which vibrates as the incoming pressure waves reach it. Bridging this cavity are three small bones—the malleus (hammer), the incus (anvil), and the stapes (stirrup). The cochlea and semicircular canals make up the inner ear.
see http://encarta.msn.com/media_701765656_761563171_-1_1/Ear_and_Hearing.html
Monday, March 23, 2009
Chapter 7 Objectives
#5. Describe the general scructure of a neuron and name its important anatomical regions.
A neuron has a cell body, which contains the nucleus and is the metabolic center of the cell, and one or more slender processes extending from the cell body. These processes vary in length from microscopic to 3-4 feet. The processes that convey incoming messages toward the cell body are dendrites, whereas those that generate nerve impulses and typically conduct them away from the cell body are axons.
#22. Discuss the distribution of the dorsal and ventral rami of spinal nerves.
After being formed each spinal nerve divides into dorsal and ventral rami, making each spinal nerve about 1/2 inch long. The rami contain both sensory and motor fibers therefore damage to either rami results in loss of sensation and flaccid paralysis of the area of the body served. The dorsal rami are smaller and serve the skin and muscles of the posterior trunk. The ventral rami of the spinal nerves T1 through T12 form the intercostal nerves, which suppy the muscles between the ribs and the skin and muscles of the anterior and lateral trunk. The ventral rami of all other spinal nerves form complex networks of nerves called plexuses.
A neuron has a cell body, which contains the nucleus and is the metabolic center of the cell, and one or more slender processes extending from the cell body. These processes vary in length from microscopic to 3-4 feet. The processes that convey incoming messages toward the cell body are dendrites, whereas those that generate nerve impulses and typically conduct them away from the cell body are axons.
#22. Discuss the distribution of the dorsal and ventral rami of spinal nerves.
After being formed each spinal nerve divides into dorsal and ventral rami, making each spinal nerve about 1/2 inch long. The rami contain both sensory and motor fibers therefore damage to either rami results in loss of sensation and flaccid paralysis of the area of the body served. The dorsal rami are smaller and serve the skin and muscles of the posterior trunk. The ventral rami of the spinal nerves T1 through T12 form the intercostal nerves, which suppy the muscles between the ribs and the skin and muscles of the anterior and lateral trunk. The ventral rami of all other spinal nerves form complex networks of nerves called plexuses.
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