Tejido Epitelial Parte A - Laboratorio Anatomia 240

Tejido Epitelial Parte A - Laboratorio Anatomia 240

Tejido Epitelial Parte A
Informe #3
Laboratorio Biología # 240
Profesor: Javier cabello
Figure 4-3a Squamous Epithelia
Escamoso Simple Epitelial
Simple Squamous Epithelium
LOCATIONS: Mesothelia lining ventral body cavities; endothelia lining heart
and blood vessels; portions of kidney tubules (thin sections of nephron loops);
inner lining of cornea; alveoli of lungs
FUNCTIONS: Reduces friction; controls vessel permeability; performs
absorption and secretion
Cytoplasm
Nucleus
Connective tissue
Lining of peritoneal cavity
LM  238
Escamoso Simple
Epitelial
Figure 4.1
Figure 4-5a Columnar Epithelia
Columnar Simple Epitelial
Simple Columnar Epithelium
LOCATIONS: Lining of
stomach, intestine, gallbladder,
uterine tubes, and collecting
ducts of kidneys
FUNCTIONS: Protection,
secretion, absorption
Microvilli
Cytoplasm
Nucleus
Intestinal lining
Basement
membrane
Loose
connective tissue
LM  350
Columnar Simple
Epitelial
Figure 4.4
Figure 4-3b Squamous Epithelia
Escamoso Estratificado Epitelial
Stratified Squamous Epithelium
LOCATIONS: Surface of skin; lining of mouth, throat, esophagus, rectum,
anus, and vagina
FUNCTIONS: Provides physical protection against abrasion, pathogens,
and chemical attack
Squamous
superficial cells
Stem cells
Basement
membrane
Connective
tissue
Surface of tongue
LM  310
Escamoso Estratificado Epitelial
Figure 4.7
Figure 4-4a Cuboidal and Transitional Epithelia
Cuboidal Simple Epitelial
Simple Cuboidal Epithelium
LOCATIONS: Glands; ducts;
portions of kidney tubules; thyroid
gland
Connective
tissue
FUNCTIONS: Limited protection,
secretion, absorption
Nucleus
Cuboidal
cells
Basement
membrane
Kidney tubule
LM  650
Cuboidal Simple
Epitelial
Figure 4.3
Cuboidal Simple
Epitelial
Figure 4.49
Figure 4-5b Columnar Epithelia
Seudoestratificado Ciliado Epitelial
Pseudostratified Ciliated Columnar Epithelium
LOCATIONS: Lining of
nasal cavity, trachea, and
bronchi; portions of male
reproductive tract
Cilia
Cytoplasm
FUNCTIONS: Protection,
secretion, move mucus
with cilia
Nuclei
Basement
membrane
Trachea
Loose
connective tissue
LM  350
Seudoestratificado
Ciliado Epitelial
Figure 4.6
Figure 4-4c Cuboidal and Transitional Epithelia
Transicional Epitelial
Transitional Epithelium
LOCATIONS: Urinary
bladder; renal pelvis;
ureters
FUNCTIONS: Permits
expansion and recoil
after stretching
Epithelium
(relaxed)
Basement membrane
Empty bladder
Connective tissue and
smooth muscle layers
LM  400
Epithelium
(stretched)
Full bladder
Urinary bladder
Basement membrane
Connective tissue and
smooth muscle layers
LM  400
LM  400
Transicional Epitelial
Figure 4.10
Figure 4-7 A Structural Classification of Exocrine Glands
SIMPLE GLANDS
Duct
Gland
cells
SIMPLE
TUBULAR
SIMPLE COILED
TUBULAR
Examples:
• Intestinal glands
Examples:
• Merocrine sweat
glands
SIMPLE BRANCHED
TUBULAR
Examples:
• Gastric glands
• Mucous glands
of esophagus,
tongue, duodenum
Epitelio Glandular
SIMPLE ALVEOLAR
(ACINAR)
Examples:
• Not found in adult; a
stage in development
of simple branched
glands
SIMPLE BRANCHED
ALVEOLAR
Examples:
• Sebaceous (oil)
glands
Figure 4-7 A Structural Classification of Exocrine Glands
Epitelio Glandular
COMPOUND GLANDS
COMPOUND
TUBULAR
Examples:
• Mucous glands (in mouth)
• Bulbo-urethral glands (in
male reproductive system)
• Testes (seminiferous
tubules)
COMPOUND ALVEOLAR
(ACINAR)
Examples:
• Mammary glands
COMPOUND
TUBULOALVEOLAR
Examples:
• Salivary glands
• Glands of respiratory
passages
• Pancreas
Figure 4-6 Modes of Glandular Secretion
Epitelio Glandular
Secretory
vesicle
Golgi
apparatus
Nucleus
TEM  3039
Salivary gland
Mammary
gland
Breaks
down
Golgi apparatus
Secretion
Regrowth
Hair
Sebaceous
gland
Cells burst, releasing
cytoplasmic contents
Hair follicle
Cells produce secretion,
increasing in size
Cell division replaces
lost cells
Stem cell