Frontal process of maxilla
Encyclopedia
The frontal process of the maxilla
(nasal process) is a strong plate, which projects upward, medialward, and backward, by the side of the nose
, forming part of its lateral boundary.
Its lateral surface is smooth, continuous with the anterior surface of the body, and gives attachment to the Quadratus labii superioris, the Orbicularis oculi, and the medial palpebral ligament
.
Its medial surface forms part of the lateral wall of the nasal cavity
; at its upper part is a rough, uneven area, which articulates with the ethmoid, closing in the anterior ethmoidal cells; below this is an oblique ridge, the ethmoidal crest, the posterior end of which articulates with the middle nasal concha
, while the anterior part is termed the agger nasi
; the crest forms the upper limit of the atrium of the middle meatus
.
The upper border articulates with the frontal bone and the anterior with the nasal; the posterior border is thick, and hollowed into a groove, which is continuous below with the lacrimal groove on the nasal surface of the body: by the articulation of the medial margin of the groove with the anterior border of the lacrimal a corresponding groove on the lacrimal is brought into continuity, and together they form the lacrimal fossa
for the lodgement of the lacrimal sac
.
The lateral margin of the groove is named the anterior lacrimal crest
, and is continuous below with the orbital margin; at its junction with the orbital surface is a small tubercle, the lacrimal tubercle
, which serves as a guide to the position of the lacrimal sac
.
Maxilla
The maxilla is a fusion of two bones along the palatal fissure that form the upper jaw. This is similar to the mandible , which is also a fusion of two halves at the mental symphysis. Sometimes The maxilla (plural: maxillae) is a fusion of two bones along the palatal fissure that form the upper...
(nasal process) is a strong plate, which projects upward, medialward, and backward, by the side of the nose
Human nose
The visible part of the human nose is the protruding part of the face that bears the nostrils. The shape of the nose is determined by the ethmoid bone and the nasal septum, which consists mostly of cartilage and which separates the nostrils...
, forming part of its lateral boundary.
Its lateral surface is smooth, continuous with the anterior surface of the body, and gives attachment to the Quadratus labii superioris, the Orbicularis oculi, and the medial palpebral ligament
Medial palpebral ligament
The medial palpebral ligament , about 4 mm. in length and 2 mm. in breadth, is attached to the frontal process of the maxilla in front of the lacrimal groove....
.
Its medial surface forms part of the lateral wall of the nasal cavity
Nasal cavity
The nasal cavity is a large air filled space above and behind the nose in the middle of the face.- Function :The nasal cavity conditions the air to be received by the other areas of the respiratory tract...
; at its upper part is a rough, uneven area, which articulates with the ethmoid, closing in the anterior ethmoidal cells; below this is an oblique ridge, the ethmoidal crest, the posterior end of which articulates with the middle nasal concha
Middle nasal concha
The medial surface of the labyrinth of ethmoid consists of a thin lamella, which descends from the under surface of the cribriform plate, and ends below in a free, convoluted margin, the middle nasal concha....
, while the anterior part is termed the agger nasi
Agger nasi
The agger nasi is a small ridge on the lateral side of the nasal cavity. It is located midway at the anterior edge of the middle nasal concha, directly above the atrium of the middle meatus...
; the crest forms the upper limit of the atrium of the middle meatus
Middle meatus
The middle meatus is a nasal opening or canal situated between the middle and inferior conchæ, and extends from the anterior to the posterior end of the latter....
.
The upper border articulates with the frontal bone and the anterior with the nasal; the posterior border is thick, and hollowed into a groove, which is continuous below with the lacrimal groove on the nasal surface of the body: by the articulation of the medial margin of the groove with the anterior border of the lacrimal a corresponding groove on the lacrimal is brought into continuity, and together they form the lacrimal fossa
Lacrimal fossa
Located on the inferior surface of each orbital plate of the frontal bone, is smooth and concave, and presents, laterally, under cover of the zygomatic process, a shallow depression, the lacrimal fossa , for the lacrimal gland....
for the lodgement of the lacrimal sac
Lacrimal sac
The lacrimal sac is the upper dilated end of the nasolacrimal duct, and is lodged in a deep groove formed by the lacrimal bone and frontal process of the maxilla...
.
The lateral margin of the groove is named the anterior lacrimal crest
Anterior lacrimal crest
The lateral margin of the lacrimal fossa is named the anterior lacrimal crest, and is continuous below with the orbital margin; at its junction with the orbital surface is a small tubercle, the lacrimal tubercle, which serves as a guide to the position of the lacrimal sac....
, and is continuous below with the orbital margin; at its junction with the orbital surface is a small tubercle, the lacrimal tubercle
Lacrimal tubercle
The lateral margin of the groove of the frontal process of the maxilla is named the anterior lacrimal crest, and is continuous below with the orbital margin; at its junction with the orbital surface is a small tubercle, the lacrimal tubercle, which serves as a guide to the position of the lacrimal...
, which serves as a guide to the position of the lacrimal sac
Lacrimal sac
The lacrimal sac is the upper dilated end of the nasolacrimal duct, and is lodged in a deep groove formed by the lacrimal bone and frontal process of the maxilla...
.