Transcript CELLS AND TISSUES

CELLS AND TISSUES
KOSTIS GYFTOPOULOS MD, PhD
ASS. PROFESSOR OF ANATOMY
TISSUE TYPES
• EPITHELIAL
• CONNECTIVE
BLOOD
• MUSCLE
• NERVOUS
EPITHELIAL TISSUE
Cells that are very tightly connected to each other,
with very little free intracellular space.
Covers the entire body, externally and internally.
• Skin + accessories
• Mucous membranes
• Glands (endocrine-exocrine)
DIFFERENT TYPES OF EPITHELIA
Squamous
Cuboidal
Columnar
Columnar ciliated
Columnar with
goblet cells
Transitional
Stratified
CONNECTIVE TISSUE
Cells are immersed into an abundant “amorphous”
intracellular substance, mainly water and
proteins.
Supports and connects other tissues.
•
•
•
•
Cartilage
Bone
Adipose
Blood and lymphatic tissue
Loose connective tissue
Cartilage
MUSCLE TISSUE
Cells are “ELASTIC”, that is they can shorten or
stretch, causing movement.
Movement is accomplished through shortening in
response to a stimulus
• Skeletal
• Smooth
• Cardiac
STRIATED MUSCLE
SMOOTH MUSCLE
CARDIAC MUSCLE
NERVOUS TISSUE
Cells are “excitable” and specialized in transmitting
stimuli or nerve impulses through special
chemical-physical activity of their membrane.
Great variation in shape, characteristics, length and
function of nervous cells, according to their role
• NEURONS
• Supporting cells
Neuroglial cells (CNS)
Schwann cells (PNS)
THE NEURON
The skin…is an organ!
(The integumentary system)
• Social function
• Protection from disease and injury
• Maintenance of homeostasis
Skin interaction with other systems
•
•
•
•
•
Muscular (face expressions)
Circulatory (vasodlation..)
Nervous system (sensory receptors)
Endocrine system (hormones..)
Immune system