1Nervous tissue/features of neurons

Neuron

cells that transmit info from sensory cells to muscles or among neurons

Glial ( neuroglial) cells

neural support tissue that provides electrical insulation and transmits nutrients to neurons

more numerous than regular neurons

Dendridtes

receives info (impulses) from other neurons or sensory receptors. single neuron may have many dendritic projections

Axons

send info to other neurons or to muscles. neuron only has one axon.

can be long and travel through spinal column

Afferent

receiving

can be thought of as sensory

Efferent

sending

can be thought of as motor

Myelin

fatty, insulating cover on neural projections, formed by oligodendrocytes or Schwann cells two types of glial cells

myoneural junctions

number of fibers innervated varies from a few to several hundred

-muscles with higher innervation is founf where fine motor control is needed

motor unit

smallest physiological component of movement consisting of neuron and the muscle fibers it innervates

Epithelium

tightly packed sheets of cells with little intercellular material.

protective, secretory, absorptive and sensory functions

• typically lines passageways and surfaces

(around)Epithelium Proper

external layer of skin (epidermis) and those membranes which are continuous with the epidermis

(ec membrane lining of digestive tract)

Endothelial tissue

no community with epidermis

-inner linings of walls of blood and lymph vessels

-composed ov flat celss that form a smooth surface

Mesothelial tissue

specialized form of epithelium that lines internal cavaties

-composed of a layer of loose connective (areolar) tissue covered by a single layer of flat cells form smooth slippery surface