V.S. of Skin
- T.S. skin of lizard shows outer epidermis and inner dermis.
- Epidermis contains horny epidermal scales characteristic of reptilian skin.
- Various layers of epidermis are stratum corneum followed by stratum germinatum or stratum malpighii from which new skin develops.
- Below stratum germinatum in loose connective tissue. Dermal papilla present beneath stratum germinatum.
- Dermis in composed of fibrous connective tissue and conjunctiva tissues.
- Dermis contains muscles, nerves blood vessels and chromatophores.
Identification: Since the section contains epidermal scales and above features, hence it is V.S. skin of lizard.
V.S. of Lung
- V.S. lung of lizard shows outer serosa enclosing lung alveoli.
- Inner lining of lung is raised into number of septa like structures, enclosing air sacs or alveoli.
- Lung contains rich blood supply.
- Alveoli are separated by septa.
- Anterior lung is more sacculated thicker and richly vascularised.
- Lung cavity is continuous.
- Bronchus entering into lung does not branches into bronchioles but it directly forms alveoli.
- In lungs deoxygenated blood is brought by pulmonary artery and oxygenated blood carried away by
Identification: Since the lung shows alveoli and above features, hence it is V.S. of lung of lizard.