Lamina (anatomy)
Lamina (anatomy) refers to a thin layer, membrane, or plate of tissue in the human body. It is a term widely used in anatomy to describe flat structures that resemble a leaf or a plate. The concept of lamina is applicable in various contexts within the body, each serving different functions depending on their location and structure. This article will explore the significance of laminae in different anatomical regions, highlighting their roles and importance.
Structure and Function[edit | edit source]
The structure of a lamina varies significantly depending on its location within the body. Generally, laminae serve as structural components, providing support and protection while also playing roles in the separation of tissues, filtration, and the facilitation of muscle attachments.
Vertebral Lamina[edit | edit source]
In the context of the vertebral column, the vertebral lamina forms a part of the vertebral arch. It serves to protect the spinal cord by contributing to the formation of the vertebral foramen. The vertebral laminae are key structures in the anatomy of the spine, providing points of attachment for muscles and ligaments.
Thyroid Lamina[edit | edit source]
The thyroid lamina refers to the two broad, flat plates of the thyroid cartilage that make up the anterior wall of the larynx. These laminae play a crucial role in protecting the vocal cords and supporting the structure of the larynx.
Basal Lamina[edit | edit source]
The basal lamina is a layer of extracellular matrix secreted by epithelial cells, on which the epithelium sits. It is part of the basement membrane, a structure that supports epithelial and endothelial cells while separating them from connective tissue. The basal lamina is essential for cell differentiation, migration, and filtration.
Clinical Significance[edit | edit source]
Abnormalities or injuries to laminae can lead to various medical conditions. For example, a laminectomy is a surgical procedure that involves the removal of a portion of the vertebral lamina to relieve pressure on the spinal cord or nerves. This procedure is often performed in cases of spinal stenosis or herniated discs.
See Also[edit | edit source]
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