Lecture 4.5: Tissues

Mucous MembranesLine cavities that communicate

with the exteriorSurface moist all of the time

Figure 4.12a

Serous MembranesSealed, internal divisions of ventral

cavityPleura—covers lungsPeritoneum—lines abdominal cavity

(covers organs like spleen and stomach)Pericardium—covers heartParietal portion—lines inner surface of

cavityVisceral portion—covers organs within

cavityMinimize friction

Figure 4.12b

Cutaneous MembraneAKA: SkinStratified squamous epithelium

and dense connective tissueThick, waterproof, dry

Figure 4.12c

Synovial MembraneArticulations (Joints)—where

bones meetLine bones at freely moving jointsProduce synovial fluidLubricates jointPermits smooth movement

Figure 4.12d

Muscle Tissue TypesSkeletal MuscleMade up of skeletal fibersStriations—striped patternMultinucleatedContract only when stimulatedVoluntary

Figure 4.13a

Muscle Tissue cont…Cardiac MuscleOnly in heartStriatedOne nucleusIntercalated discs—connect cellsPacemaker cells—set up regular

rate of contractionInvoluntary

Figure 4.13b

Muscle Tissue cont…Smooth MuscleIn hollow organs1 nucleusNo striationsInvoluntary

Figure 4.13c

Neural TissueMostly in brain and spinal cordNeurons—nerve cellsNeuroglia—supporting cells

Figure 4.14a