![]() ![]() When the connective tissue between the adjacent bones is reduced to a narrow layer, these fibrous joints are now called sutures. ![]() The fontanelles greatly decrease in width during the first year after birth as the skull bones enlarge. After birth, these expanded regions of connective tissue allow for rapid growth of the skull and enlargement of the brain. During birth, the fontanelles provide flexibility to the skull, allowing the bones to push closer together or to overlap slightly, thus aiding movement of the infant’s head through the birth canal. In regions that become suture joints, the mesenchymal tissue is converted to dense regular connective tissue proper by fibroblasts. Fontanelles are regions of mesenchymal connective tissue membranes that continue to ossify following birth. Recall that skull bones are formed via intramembranous ossification. The mastoid fontanelle, found toward the posterior of the skull, connects that occipital bone, parietal bone, and temporal bone. The sphenoidal fontanelle is located toward the anterior of the skull just superior to the sphenoid bone and connects the sphenoid bone, frontal bone, parietal bone, and temporal bone. On the sides of the skull are two fontanelles, the sphenoidal fontanelle and the mastoid fontanelle. The posterior fontanelle can be found on the back side of the skull between the parietal bones and occipital bone. For some newborns, the anterior fontanelle is visible on the top of the head, and is often called the infant's "soft spot". The most prominent fontanelle is the anterior fontanelle, which can be found on top of the skull between the frontal bone and the parietal bones. “Human skull side simplified (bones)” by LadyofHats Mariana Ruiz Villarreal – (Public Domain) via Wikimedia Commons “Gray194” by Henry Vandyke Carter – Henry Gray (1918) Anatomy of the Human Body (See “Book” section below): Gray’s Anatomy, Plate 194.\)). Skull: Skull has the cranial cavity and smaller sinuses.Ĭranium: Cranium makes the cranial cavity in which the brain is located. Skull: Skull protects the brain, provides a surface for muscle attachments and holds sensory organs for vision, hearing, speech and vision.Ĭranium: Cranium mainly protects the brain and provides surfaces for facial muscle attachments. Features of Skull and Cranium Number of bonesĬranium: Cranium consists of 8 bones called cranial bones. ![]() Skull: Skull refers to the bones of the head collectively.Ĭranium: It is the bony portion of the skull that holds the brain. What is the difference Skull and Cranium? Definition of Skull and Cranium The edge of each bone is joined with an adjacent bone edge through fibrous interlocking joints called ‘sutures’. The walls of cranial walls are composed of two plates. In addition, cranium provides a surface for the attachment of muscles that helps the movement of the head and supports the sense organs located in the head. The main role of the cranium is to protect the brain. Among these bones, parietal bones and the frontal bone are the largest. The eight bones include ethmoid, frontal, occipital, parietal (2), sphenoid, and temporal (2). The cranium is a subdivision of the skull that consists of 8 bones, which enclose the brain. Facial bones provide surfaces to muscle attachments and make passages to respiratory and digestive systems. Moreover, the skull is involved in speech, breathing, vision, and hearing. Most importantly, it provides protection for the most important organ of the nervous system the brain. The great architectural design of the skull reflects its many functions. The other several cavities found within the skull are called sinuses that accommodate the hearing and equilibrium structures. The main cavity of the skull that encloses the brain is called cranium cavity. The skull is located on the atlas of the vertebral column. The human skull is a complex structure consisting of 22 bones which mainly comprises cranial bones (8) and facial bones (14). In this article, further differences between skull and cranium will be highlighted. The main difference between the skull and cranium is that skull is a complex structure containing 22 bones while cranium is a subdivision of the skull, containing only 8 bones. Skull and cranium are two important skeletal parts that protect the brain and supports other soft tissues located in the head, but a difference can be noted between them based on their structure. ![]()
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