IB131_8.28.09_TISSUES

IB131_8.28.09_TISSUES - Development Gradual modification of...

Info iconThis preview shows pages 1–15. Sign up to view the full content.

View Full Document Right Arrow Icon
Development Gradual modification of anatomical structures and physiological characteristics from fertilization to maturity
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Development Differentiation Creation of different types of cells required in development Occurs through selective changes in genetic activity As development proceeds, some genes are turned off, others are turned on Fertilization Also called conception When development begins
Background image of page 2
Development Embryological Development Occurs during first 2 months after fertilization Study of these events is called embryology Fetal Development Begins at start of ninth week Continues until birth
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Development Prenatal Development Embryological and fetal development stages Postnatal Development Commences at birth Continues to maturity when aging process begins
Background image of page 4
Embryonic Tissues Embryo begins as single cell 3 Primary germ layers ectoderm (outer) “attract-o-derm” forms epidermis and nervous system endoderm (inner) forms mucous membrane lining GI tract, respiratory mesoderm (middle) becomes mesenchyme “means-o-derm” gives rise to muscle, bone, blood
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Cellular Classification & Tissue Histology
Background image of page 6
Histology- ”Study of Tissues” 200 different cell types 4 primary tissue classes : Epithelial Tissue Connective Tissue Nervous Tissue Muscular Tissue Organ =structure w/ discrete boundaries Composed of 2 or more tissues
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Features of Tissue Classes Arose from same region of embryo Differences b/w tissue classes Characteristics of ECM Fibrous proteins Ground substance Clear gels (ECF, tissue fluid, interstitial fluid, tissue gel) Space occupied by cells vs. matrix Connective tissue: widely separated Little matrix b/w epithelial & muscle cells
Background image of page 8
Cell Shapes
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Cell Shapes Squamous = thin and flat Polygonal = irregularly angular with 4 or more sides Cuboidal = squarish Columnar = taller than wide Spheroid = round Discoid = disc-shaped Stellate = starlike Fusiform = thick in middle, tapered at ends Fibrous = threadlike
Background image of page 10
Cell Size Human cell size most from 10 - 15 μm in diameter egg cells (very large)100 μm diameter nerve cell (very long) at 1 meter long Limitations on cell size cell growth increases volume faster than surface area nutrient absorption and waste removal utilize surface
Background image of page 11

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Cell Surface Area & Volume
Background image of page 12
Major Constituents of Cell
Background image of page 13

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Preparation of histological specimens fixative prevents decay (formalin) sliced into thin sections 1 or 2 cells thick mounted on slides and colored with histological stain stains bind to different cellular components Sectioning reduces 3-dimensional structure to 2-dimensional slice
Background image of page 14
Image of page 15
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 08/30/2009 for the course IB 131 taught by Professor Diamond during the Spring '07 term at Berkeley.

Page1 / 87

IB131_8.28.09_TISSUES - Development Gradual modification of...

This preview shows document pages 1 - 15. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online