Squamous part of the frontal bone

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Squamous part of the frontal bone refers to the largest portion of the frontal bone, one of the skull bones in the human body. This part is named 'squamous' due to its scale-like, flat nature. It forms the forehead and the upper parts of the orbital cavities, playing a crucial role in the overall structure and protection of the brain and the eyes.

Anatomy

The squamous part is the anterior and largest part of the frontal bone. It is bordered by several important anatomical landmarks:

• Superiorly, it extends to the coronal suture, where it articulates with the parietal bones.
• Inferiorly, it contributes to the roofs of the orbital and nasal cavities.
• The supraorbital margin is a key feature at the lower part of the squamous region, providing passage for the supraorbital nerve and vessels.
• The glabella is a smooth area between the eyebrows, directly above the nasal bones.
• Laterally, the zygomatic processes extend to articulate with the zygomatic bones.

Function

The squamous part of the frontal bone plays several vital roles:

• Protection of the frontal lobes of the brain.
• Supporting the structure of the face, particularly the forehead and the upper eye sockets.
• Providing attachment points for various muscles, including those involved in facial expression.

Development

The frontal bone, including its squamous part, initially develops as two separate pieces during fetal development. These pieces usually fuse together by the age of six to form a single bone. This fusion line is called the metopic suture, which may remain partially visible in some adults.

Clinical Significance

Injuries to the squamous part of the frontal bone can have serious implications due to its protective role for the brain and eyes. Fractures in this area may require surgical intervention, especially if they involve the sinuses or the orbital cavities. Conditions such as craniosynostosis, where the sutures of the skull close prematurely, can also affect the shape and function of the squamous part.

See Also

• Frontal bone
• Skull
• Cranial sutures
• Orbital cavities