Orbital Cavity

The orbital cavities are large bony sockets that house the eyeballs with associated muscles, nerves, blood vessels and fat. Each orbit is pear-shaped with the optic nerve representing the stem. The medial walls of the orbit are almost parallel and border the nasal cavity anteriorly.

Nasal Cavity

The nasal cavity is the space inside the nose that's made up of bones, tissues, blood vessels, and nerves. It's the uppermost part of the respiratory system and is lined with a mucous membrane. 

Oral Cavity

The mouth, or oral cavity, is the first part of the digestive tract. It is adapted to receive food by ingestion, break it into small particles by mastication, and mix it with saliva. The lips, cheeks, and palate form the boundaries.

Tympanic Cavity

The middle ear cavity, also known as the tympanic cavity or tympanum, is a small, air-filled chamber in the temporal bone. It's made up of three parts:

• Mesotympanum: The middle ear space next to the tympanic membrane

• Epitympanic recess: Above the tympanic membrane

• Hypotympanum: Below the tympanic membrane 

The middle ear is separated from the external ear by the tympanic membrane and from the inner ear by the medial wall of the tympanic cavity. It's also connected to the pharynx by the Eustachian tube. 

Cranial Cavity

The cranial cavity, also known as the intracranial space, is the space within the skull that contains the brain. It's formed by eight cranial bones, called the neurocranium, that protect the brain. The cranial cavity contains the brain, meninges, and cerebrospinal fluid. The cranial cavity also contains the brain's meninges, blood vessels, and cranial nerves.