Human Nose: Introduction, Bones of the Nose and Septal Cartilage

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Introduction to Nose

  • The human nose is one of the most important parts of the face.

  • It is the first region of the respiratory system and bearing nostrils.

  • It is also the principle organ in the olfactory system.

    • It is the sensory system used for smelling (olfaction).

  • Head anatomy includes olfactory nerve, including labels for the nasal cavity, olfactory nerves, cribriform plate, olfactory bulb, and olfactory tract.

  • The shape of the nose is determined by the nasal bones and the nasal cartilages.

Olfactory System

Olfactory System

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Bones of the Nose and Septal Cartilage

Bones of the nose and septal cartilage

Bones of the Nose and Septal Cartilage

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Structure of Nose

Structure of Nose

Structure of Nose

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Bone

It is responsible for supporting the bridge of the nose.

Cartilage

  • It involves upper cartilage and lower cartilage.

  • The lower cartilage is responsible for adding width and height to the nose while the upper cartilage provides support to the sides of the nose.

Nasal Cavity

It is the hollow space through which the air flows.

Septum

It is a thin wall made up of bones and cartilage.

Mucus Membrane

  • The mucus membrane lines the nose, sinuses, and throat.

  • A sticky mucus is formed that prevents dust and other small particles into the nose.

Turbinates

  • Each side of the nose contains curved turbinates.

  • The bony ridges are lined with mucus membrane.

Sinuses

  • These are the hollow, air-filled chambers around the nose.

  • It is through sinuses only that the mucus flows into the nasal cavity.

Functions of Nose

Functions of Nose

Functions of Nose

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FAQs

Q 1. What are the important functions of human nose?

Answer:

The important functions of Human Nose are:

i) It helps in Inhalation.

ii) It helps in purification of Inhaled Air.

iii) It helps in sense of taste.

iv) It acts an organ of smell.

Q 2. What are olfactory tract and olfactory nerves?

Answer:

  • The olfactory tract is a bilateral bundle of afferent nerve fibers from the mitral and tufted cells of the olfactory bulb.

  • It connects to several target regions in the brain, including the piriform cortex, amygdala, and entorhinal cortex.

  • The olfactory nerve is the first cranial nerve that conveys special sensory information related to smell.

Q 3. What are the main components in the Structure of Nose?

Answer:

The main components in the structure of nose are:

i) Bone

ii) Cartilage

iii) Nasal Cavity

iv) Septum

v) Mucus Membrane

vi) Turbinates

vii) Sinuses

Q 4. What are the two important parts responsible for shaping up the nose?

Answer:

The two important parts responsible for shaping up the nose are:

i) Nasal bones

ii) Nasal cartilages