11: Nose and Nasal Cavity

CHAPTER 11

NOSE AND NASAL CAVITY

Overview and Topographic Anatomy

Nose

Nasal Cavity

Clinical Correlates

Imaging

Questions

Overview and Topographic Anatomy

GENERAL INFORMATION

Nose

The prominent anatomic structure located inferior and medial to the eyes

Helps in breathing and olfaction

Nasal Cavity

The complex chamber located posterior to the vestibule and atrium of the nose

Respiratory Epithelium

Highly vascular and easily congested

When this tissue is irritated, its blood vessels reflexively dilate and the glands secrete, normally leading to sneezing

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Nose

ANATOMY OF THE NOSE

The nose is pyramidal in form

3 pairs of bones form the root of the nose:

Frontal (nasal process)

Maxilla (frontal process)

Nasal

Because the root of the nose is made of bone, it is fixed

3 different cartilages form the dorsum and apex of the nose:

Septal

Lateral nasal

Alar

Because the dorsum and apex are cartilaginous, the nose is quite mobile

The cavity of the nose opposite the alar cartilage is called the vestibule and is lined by many coarse hairs called vibrissae

The cavity superior to the vestibule is the atrium

At the apex are found the 2 nostrils, or anterior nares, which are separated by the septum connecting the apex to the philtrum of the upper lip

Fibrous tissue helps connect the cartilages together and posteriorly to the maxilla

The primary lymphatic drainage of the nose is into the submandibular lymph nodes

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VASCULAR SUPPLY OF THE NOSE

The blood supply to the nose arises from 3 major arteries:

Ophthalmic

Maxillary

Facial

These vessels are derived from the external and internal carotid arteries

These arteries anastomose along the nose

Many nosebleeds are due to trauma to the septal branch of the superior labial artery from the facial artery

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NERVE SUPPLY OF THE NOSE

The sensory supply to the nose arises from branches of the ophthalmic and maxillary divisions of the trigeminal nerve

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Jan 5, 2015 | Posted by in General Dentistry | Comments Off on 11: Nose and Nasal Cavity
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