Which of the following choices for staying safe is the best to attempt first when trying out a new activity?

Identify, define and break down 10 medical terms related to the nervous system.

lutik1710 [3]

Axons are long nerve processes which carry nerve impulses from the Soma to other neurons, they vary in length but can become almost as long as half of the human body.

The soma (body) of the neuron contains the nucleus which acts as the cell's control centre, these contain many small neurofibrils which project from the nucleus into the dendrites.

Dendrites are short, thick processes which branch out of the soma in a tree like manor. They conduct nerve impulses to the soma.
The three categories of neurons:

Afferent (Sensory) Neurons have the dendrites connected to receptors such as the eyes, ears etc. These receptors change the information they receive into electrical impulses that are transmitted to other neurons. In sensory neurons the axons are connected to other neurons.

Efferent (Motor) Neurons have the dendrites connected to other neurons, the axons are connected to effectors. Effectors are either glands or a muscle cell that is the receiving end of the nerve impulse. The nerve, when excited will cause the effector to react (move, contract, or secrete etc).

Internuncial Neurons have both the dendrites and the axons are connected to other neurons. They are sometimes referred to as connector neurons.
Internuncial neurons are found throughout the body, but especially in the spinal cord and brain.

Properties and characteristics of Neurons:
Normally the electrical impulses (messages) travel through a neuron in only one direction.

The axon may be surrounded by a 'coat' of lipids (fats) and proteins known as the myelin sheath which acts as an insulator.

Neurons are specialist cells that have lost the ability to reproduce themselves. Once the soma of a neuron has died the entire neuron dies, and can never be replaced.
Repair of damaged neurons only occurs in myelinated neurons.

white matter are coloured by myelin, consisting of many neurons supported by neuroglia.
grey matter is soma and dendrites or bundles of unmyelinated axons and neuralgia.

8 0

2 years ago

Prenatal development...Please only Answer if you know the Answer.

suter [353]

Answer:

As part of the development of the neural tube, by the sixth week of embryonic development, the brain vesicles are already formed.

Explanation:

The encephalic vesicles correspond to a group of dilations that will give rise to the brain and its related structures.

Around the 4th week of embryonic development, the primary encephalic vesicles are formed, and by the 6th week there will also be secondary encephalic vesicles, for a total of five divisions.

The five encephalic vesicles formed in week 6 of embryonic development are the myelencephalon, metencephalon, midbrain, diencephalon and telencephalon.

myelencephalon : It is the structure that is organized to form the spinal bulb, in addition to the motor nuclei of the cranial nerves (pairs) IX to XII.
Metencephalon : It gives rise to the cerebellum and the protrusion.
Midbrain : It forms important structures such as the Edinger-Westphal nucleus, the wing plates, the tegment - together with the nuclei of the cranial nerves III and IV - and the upper cerebellar pedicles.
Diencephalon: gives rise to the Thalamus, hypothalamus and pituitary gland.
Telencephalon: originates the structure of each cerebral hemisphere, besides the striated body and its respective divisions in caudate and lenticular nuclei.