The occipital bone is a cranial bone that forms the posterior part of the skull and surrounds the back and base of the brain. Here are some key features and information about the occipital bone:

  1. Foramen Magnum: This is the large, oval opening in the occipital bone through which the spinal cord passes to connect with the brain. It is a crucial structure in the skull, and it allows for the transition between the spinal cord and the medulla oblongata of the brainstem.
  2. Occipital Condyles: There are two rounded projections on the sides of the foramen magnum called occipital condyles. These articulate with the first cervical vertebra (atlas) and form the atlanto-occipital joint, allowing for nodding movements of the head.
  3. External Occipital Protuberance: This is a prominent bump at the midline of the posterior skull, often referred to as the “inion.” It serves as an attachment point for ligaments and neck muscles.
  4. Nuchal Lines: The occipital bone has several curved lines that serve as attachment points for various neck muscles and ligaments. These include the superior nuchal line, which runs horizontally and the inferior nuchal line, which is slightly below it.
  5. Squamous Part: The occipital bone has a flat, curved, and expanded portion known as the squamous part. It surrounds the foramen magnum and makes up the posterior part of the cranial vault.
  6. Lambdoid Suture: The occipital bone articulates with the parietal bones at the lambdoid suture, forming the posterior part of the skull’s cranial vault.
  7. Functions: The occipital bone’s primary function is to protect the posterior part of the brain, including the cerebellum and brainstem. It also provides important attachments for muscles and ligaments that allow for head movement and stability.

The occipital bone is a critical component of the human skull, contributing to its structural integrity and serving various anatomical and physiological functions related to the brain and neck.

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