Although the nervous system functions as a coordinated whole, it is divided into anatomical and functional divisions as an aid in understanding this complex organ system. Anatomical Divisions The nervous system has two major anatomical divisions. The central nervous system (CNS) consists of the brain and spinal

Neuroendocrine Positive-Feedback Mechanism Controlling Labor

During the latter stages of pregnancy, the blood concentration of estrogens become increasingly greater than that of progesterone, as noted earlier. Whereas progesterone inhibits uterine contractions, estrogens promote them. Therefore, there is an increasing tendency toward the onset of uterine contractions as the pregnancy approaches full term.

Nervous Tissue

The nervous system consists of organs composed primarily of nervous tissue supported and protected by connective tissues. There are two types of cells that compose nervous tissue: neurons and neuroglia. Neurons Neurons, or nerve cells, are the structural and functional units of the nervous system. They are

Cerebrospinal Fluid

CSF = cerebrospinal fluid It is quite similar to blood plasma and interstitial fluid. It’s present in the ventricular system inside the CNS and in the subarachnoid space surrounding the CNS. It gives a protective cushion between the CNS and the neighboring bones and bathes both the

What Is The Mechanism of Synaptic Transmission?

A synapse is a junction of an axon with either another neuron or an effector cell. At a synapse, the terminal bouton of the presynaptic neuron fits into a small depression on the postsynaptic neuron’s dendrite or cell body or on a cell within a muscle, a