Connective Connective Tissue:Tissue:

What Kevin Bacon What Kevin Bacon taught me about tissues?taught me about tissues?

Another off the wall discussion to Another off the wall discussion to complete your outer valence shellcomplete your outer valence shell

What is connective tissue?What is connective tissue?

BBloodlood

ccAArtilagertilage

conneconneCCtive tissuetive tissue

fibrfibrOOus us

boboNNe e

FunctionsFunctions

1.1. Connects– Connects– ex. fascia, ligamentsex. fascia, ligaments

2.2. Supports – Supports – ex. skeleton, cartilageex. skeleton, cartilage

3.3. Transports – Transports – ex. bloodex. blood

4.4. Defends – Defends – ex. lymph nodes, spleenex. lymph nodes, spleen

5.5. Insulation – Insulation – ex. Adiposeex. Adipose

Just like Kevin Bacon in all his movies!!!!

CharacteristicsCharacteristics1.few cells 1.few cells mostly extracellular material or mostly extracellular material or

matrixmatrix

2.range of vascularity2.range of vascularity

3.fibers: 3.fibers: 1.1. collagenous (tough and high tensile strength; white) collagenous (tough and high tensile strength; white)

2.2. reticular (delicate, branching network)reticular (delicate, branching network)

3.3. elastic (long, thin, stretchable; yellow)elastic (long, thin, stretchable; yellow)

4.origin is 4.origin is mesodermalmesodermal

Types of Connective TissueTypes of Connective Tissue

Fibrous – extracellular Fibrous – extracellular fibersfibers

1.1. LooseLoose, ordinary (AKA , ordinary (AKA areolarareolar) – common; ) – common; wraps and cushions wraps and cushions organs organs

ex. fascia ex. fascia

2.2. AdiposeAdipose - mostly fat - mostly fat cells; storage & insulationcells; storage & insulation

ex. mammary, under skin, ex. mammary, under skin, abdominal regionsabdominal regions

Types of Connective TissueTypes of Connective Tissue

Fibrous – extracellular Fibrous – extracellular fibersfibers

3.3. ReticularReticular - branching network; - branching network; defense – filters blood and defense – filters blood and lymphlymph

ex. spleen, lymph nodes, bone ex. spleen, lymph nodes, bone marrowmarrow

4.4. Dense, White FibrousDense, White Fibrous - few - few fibroblasts; tightly packed; fibroblasts; tightly packed; regular (parallel) vs. irregular regular (parallel) vs. irregular (stretchable); anchors muscle (stretchable); anchors muscle to bone to bone

ex. tendonsex. tendons

Types of Connective TissueTypes of Connective Tissue

Bone- osseous tissueBone- osseous tissue

Ground or compact bone- Ground or compact bone- osteon or Haversian osteon or Haversian system (appear like a tree system (appear like a tree trunk of rings)trunk of rings)

Spongy or cancellous bone- Spongy or cancellous bone- porous; few cells with porous; few cells with bloodblood

Types of Connective Tissue Types of Connective Tissue

Cartilage – avascular; heals Cartilage – avascular; heals slowly; tough but flexibleslowly; tough but flexible

1.1. HyalineHyaline - “glass”; translucent - “glass”; translucent ex. covers ends of bonesex. covers ends of bones

2.2. FibrocartilageFibrocartilage – strongest, – strongest, collagen fiberscollagen fibers

ex. intervertebral disks, kneeex. intervertebral disks, knee3.3. ElasticElastic – flexible, elastic fibers in – flexible, elastic fibers in

matrix matrix ex. ear, voice box, noseex. ear, voice box, nose

Types of Connective tissueTypes of Connective tissue

BloodBlood

lacks fiberslacks fibersconsists of plasma consists of plasma (55% water & 45% (55% water & 45% erythrocytes, erythrocytes, leukocytes, & leukocytes, & thrombocytes)thrombocytes)transports gases, transports gases, nutrients, wastenutrients, wastemaintains temp. and maintains temp. and pH; defensepH; defense