6 Questions
Which cranial suture runs from one ear canal to the opposite ear canal?
Coronal suture
Which cranial suture divides the forehead bone into two halves?
Metopic suture
Which cranial suture divides the skull into right and left hemispheres?
Metopic suture
Which cranial suture runs between the parietal bones along the back of the head?
Lambdoid suture
Which cranial suture divides the forehead bone and usually closes by age 25?
Coronal suture
Where are squamous sutures located in adult cranial bones?
At the joints where flat bones meet each other
Study Notes
Cranial Sutures
Cranial sutures refer to the fibrous connective tissues that bind together the flat bones of the skull. These sutures help protect the soft brain tissue, facilitate expansion during growth, and allow for minor head movements due to their elastic nature. In humans, there are five cranial sutures: sagittal, coronal, metopic, lambdoid, and squamosal.
Sagittal Suture
The sagittal suture is the largest and most prominent of the three longitudinal cranial sutures. It divides the skull into right and left hemispheres along its midline. The sagittal suture ossifies later in life compared to other sutures, which makes it more susceptible to injury.
Coronal Suture
The coronal suture runs from one ear canal to the opposite ear canal across the top of the skull. This suture also tends to close earlier than expected, making it less visible in adults.
Metopic Suture
The metopic suture divides the forehead bone, or frontal bone, into two halves from one brow ridge to another. The metopic suture usually closes by age 25.
Lambdoid Suture
The lambdoid suture runs between the parietal bones along the back of the head, behind the ears.
Squamous Sutures
Squamous sutures are located at the joints where the flat bones meet each other. They are present in all adult cranial bones except the sphenoid bone.
Cranial sutures play crucial roles in maintaining the integrity of the skull and protecting the brain tissue. Understanding these sutures can offer valuable insights into skeletal development and disorders associated with suture fusion or premature closure.
Learn about the different types of cranial sutures, including sagittal, coronal, metopic, lambdoid, and squamous sutures, and their roles in protecting the brain and facilitating skull growth. Explore how these sutures contribute to skeletal development and understand disorders related to suture fusion or premature closure.
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