Anatomy part 3

 Organ of special sense

They are:-

Organ of taste - tongue

Organ of sight- eye

Organ of hearing - ears

Organ for tackle sensation - skin

Organ for smell - nose

Cavities of the body

Body cavities are the spaces within the body that help protect , separate and support the internal organs.there are four cavities____

1. Cranial cavity

2. Thoracic cavity

3. Abdominal cavity

4. Pelvic cavity

# Cranial cavities

The eight cranial bones from a hollow space of the head called cranial cavity.It contains brain

Boundaries for of cranial cavity

Anteriorly :-  one frontal bone 

Posteriorly :-  one occipital bones

Superiorly :-  two parietal bone 

Inferiorly :-  one  sphenoid and ethmoid

Laterally :- two temporal bone

# Thoracic cavity

This cavity is situated in the upper part of the trunk.

 Boundaries of thoracic cavity

Anteriorly :- Sternum

Posteriorly:- thoracic vertebrae (12)

Superiorly:- Structure forming root of neck

Inferiorly:- Diaphragm

Laterally:- 12 pair of ribs and intercostal muscles.

Contents

-- Trachea , two bronchi , two lungs

-- Heart , arota , superior and inferior vena cava and other blood vessels.

-- Oesophagus

-- Lymph vessels and lymph nodes

-- Nerves

3. Abdominal cavity

This is the largest cavity in the body and is oval in shape. It is situated in the main part of trunk.

Boundaries of Abdominal cavity

Anteriorly:- anterior abdominal valve muscles

Posteriorly:- posterior abdominal valve muscles and lumber vertebrae

Superiorly:-  Diaphragm

Inferiorly:-  pelvic cavity

Laterally:- lower ribs and parts of lateral abdominal valve.

4. Pelvic cavity

The pelvic cavity is roughly funnel shaped and extends from the lower end of abdominal cavities.

Boundaries of pelvic cavities

Anteriorly:- pubic bone

Posteriorly:- Sacrum and coccyx

Superiorly:- Abdominal cavity

Inferiorly:- Muscles of the pelvic floor

Laterally:- Innominate bones