Boundaries Of The Nasal Cavity

The nasal cavity is bordered by the following structures (Figure 23-1A-C):

Roof. Formed by the nasal, frontal, sphenoid, and ethmoid bones (cribriform foramina, which transmits CN I for smell). Floor. Formed by the maxilla and the palatine bones. The incisive foramen transmits branches of the sphenopalatine artery and the nasopalatine nerve for general sensation from the nasal cavity and palate.

Medial wall (nasal septum). Formed by the perpendicular plate of the ethmoid bone, the vomer bone, and the septal cartilage.

Lateral wall. Formed by the superior, middle and inferior nasal conchae. In addition, the maxillary, sphenoid, and pala tine bones contribute to the lateral wall. The lateral wall contains the following openings:

• Sphenoethmoidal recess. The space between the superior nasal concha and the sphenoid bone, with openings from the sphenoid sinus.

• Superior meatus. The space inferior to the superior nasal concha, with openings from the posterior ethmoidal air cells.

• Middle meatus. The space inferior to the middle nasal concha, with openings for the frontal sinus via the nasofrontal duct, the middle ethmoidal air cells on the ethmoidal bulla, and the anterior ethmoidal air cells and maxillary sinus in the hiatus semilunaris.

• Inferior meatus. The space inferior to the inferior nasal concha, with an opening for the nasolacrimal duct, which drains tears from the eye into the nasal cavity.

• Sphenopalatine foramen. An opening posterior to the middle nasal concha receives the nasopalatine nerve and the sphenopalatine artery from the pterygopalatine fossa into the nasal cavity.

VRhinorrhea, or "runny nose," is evident by the clear fluid that leaks out of the nostrils. A runny nose usually accompanies the common cold. Rhinorrhea usually results from overproduction of mucus resulting from conditions such as sinusitis, hay fever, and allergic reactions. However, rhinorrhea that occurs after an accident involving head trauma may indicate a basilar skull fracture, resulting in leakage of cerebrospinal fluid from the subarachnoid space through the fracture (often the ethmoid bone) into the nasal cavity and out of the nostrils. ▼

Superior concha Middle concha —

Inferior concha A

Spheno-ethmoidal recess

Superior meatus Middle meatus

— Inferior meatus

Nasal septum

Perpendicular plate of ethmoid bone

Frontal sinus and bone

Nasal bone

Septal cartilage

Sphenoid sinus

Communication of the nasal cavity with the face via the nostrils

Perpendicular plate of ethmoid bone

Sphenoid sinus

Frontal sinus and bone

Nasal bone

Septal cartilage

Communication of the nasal cavity with the face via the nostrils

Sella turcica

Communication of the nasal cavity with the nasopharynx via the choanae

Maxilla

Vomer

Palatine bone

Sella turcica

Communication of the nasal cavity with the nasopharynx via the choanae

Maxilla

Vomer

Palatine bone

Opening of middle ethmoid air cells into the ethmoid bulla

Superior nasal concha and opening of the posterior ethmoidal air cells into the superior meatus

Opening of sphenoidal sinus into spheno-ethmoidal recess

Hiatus semilunaris

Opening of the maxillary sinus into the hiatus semilunaris

Frontal sinus

Opening of the frontonasal duct that drains the frontal sinus and anterior ethmoid air cells

Middle nasal concha (cut) and meatus

Opening of middle ethmoid air cells into the ethmoid bulla

Frontal sinus

Middle nasal concha (cut) and meatus

Hiatus semilunaris

Opening of the maxillary sinus into the hiatus semilunaris

Opening of nasolacrimal duct

Incisive canal

Inferior nasal concha (cut) and meatus

Figure 23-1: A. Coronal section through the nasal cavity. B. Nasal septum from the left side. C. Lateral nasal wall of the left nasal cavity.

Opening of nasolacrimal duct

Incisive canal

Inferior nasal concha (cut) and meatus

Figure 23-1: A. Coronal section through the nasal cavity. B. Nasal septum from the left side. C. Lateral nasal wall of the left nasal cavity.

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